In order to know the rodent control measure at demolished area and prevent the dispersion of commensal rodents, we measured the change of rodent density around the demolished area by using scene investigation test in which test zone and contrast zone had been set.The procedures included principal rodent control measure of chemical killing and one or two rodent defence zone, with clip method, powder track method and feeding method for detecting rodent density.The results showed that:(1) If rodent control measure taken before pulling down, the damage caused by rodent around the demolished area decreased evidently.The positive rate of rodent track around the contrast zone increased 5.07 times with powder track method, and the positive rate of feeding method increased 3.98 times.(2) If rodent control measure taken and rodent defence zone set, the rodent density around the zone decreased 29.80 percent, though the rodent density of the contrast zone increased 5.16 times.(3) If rodent control measure taken two times and rodent defence zone set, the damage caused by the rodent around the zone decreased 66.24 percent, comparing to taking rodent control measure one time and with rodent defence zone.If we take two times killing measure and set defence zone before pulling down, not only the dispersion of commensal rodent at the demolished area can be entirely controlled, but also the damage caused by the rodent around the area can be decreased.

Amounts of feeding, water drinking and energy intake were compared between Rattus norvegicus and Rattus niviventer confucianus in this paper.We conducted the experiment in April, 1997,and used rice and peanut as diet.Results showed that the mean daily amounts of feeding, water drinking and energy intake on per kilogram of body weight were higher in Rattus niviventer confucianus than in Rattus norvegicus.The interspecific differences may be explained by the fact that Rattus niviventer confucianus resides in more complex habitant than Rattus norvegicus.

The paper reported the Mice LD ₅₀ determination and Rodent control field tests with Botulinum Type C.The LD ₅₀ were 0.0891±0.0473 ml/kg by 25℃ for 48h; 0.1363±0.0597 ml/kg by 30℃ for 48h;0.1712±0.0652ml/kg by 35℃ for 48h.The Botulinum Type C was powerful for rodent control.In the field tests with rice baits, the killing rate by the Botulinum Type C was 91.08%; 89.41% and 88.04%.It was showed that the Botulinum Type C fit in with the South China.

In this paper,the C6/36 cell growth rate and karyokinesis, after adding the DM(10μg/ml、20μg/ml、40μg/ml) on culture, were dynamic observed using ictus method for revealing the effects of DM on C6/36 cell line proliferation.The inhibitory effects of higher DM on the cell line proliferation and a doseresponse effects were observed.The inhibited cells were regenerated after recession of DM treatment on the cell line.It was showed inhibitory effects of DM on the proliferation of C6/36 cell was reversible.

To determine protein component, specific protein molecular from normal larvae, pesticidesresistant larvae of Culex fatigans and evaluation of the specific insecticideresistance protein bands.Soluble proteins of the late Ⅲinstar and the early Ⅳinstar larvae of both normal and pesticidesresistant mosquito were prepared.Protein component bands were tested by SDS-PAGE.The normal larvae of Culex fatigans contained mainly 12 protein bands, the 55 and 50KDa were particular protein molecular, and insecticide-resistance larvae to Malathion and Deltamethrin present at 15 and 17 protein bands respectively.The 66KDa that stronger and clearer protein bands was recognized by resistance larvae only.It could be one of the main proteins to cause mosquito larvae resistance.

In the present paper,the writers attempt to deal with the problem of the delimitation of the boundaries of zoogeographical regions in Hubei on the basis of the mosquitoes fauna of the province.Among the 11 genera and 72 species of mosquitoes listed,53 species (or 73.6%) belong to the species entirely or mainly distributed in the oriental region, 11 species (or 15.3%) to those entirely or mainly distributed in the palaearctic region, and 8 species (or 11.1%) to those distributed in both oriental and palaearctic region.Basing on the comparison of the mosquito fauna of the adjacent provinces, including Hunan, Jianxi and Henan, the writers suggests that Hubei province should be included in the oriental region but the North-Western part, lying north of 32° N latitude of the province be included in the palaearctic region.

During recent years, the investigation revealed that the pool amounts at constructing sites were significantly breeding in urban area.The paper reported a result of the mosquito control with Clarias fuscus wich was introduced from Egypt in 1994-1995.A fish about 10g or 12cm long can catch 1200 larvae of Culex pipiens quinquefasciatus;a fish of 500g can catch 26000 larvae at least for one day Before putting in the fish, the average larvae density was 465 worms/spoon (350ml), the biting rat was 147 times/m.h in night at the trial area where there were 37 pools about 2000m ² at a underground constructingsite.Since putting in Clarias fuscus, the densities of larvae and adults were descended quickly and the pools wer not found with mosquito breeding after a week.The average biting rat was 16/m.h at the area where no constructing sites.RPI were 0.013 and 0.095 in the area of trial and contrast.The result shown the densities of larvae and adult mosquitoes was descended 98.7% and 90.5% respectively. Claria fuscus were growing well in the breeding sits and can survive in winter in Fuzhou.The result showed the fish is a good natural enemy to mosquito.

Helina yushuensis sp.nov.(figs.1-3)Male Body length 8.0-9.5mm.It is similar to the species Helina hirtifemorata Malloch, 1926, but differing from the latter with frons wider, about 1.5 times the distance between posterior ocelli inclusive; mid femur with a complete row of pv;mid tibia with 1 ad, 3(5) p; hind femur only with short hairs on ventral surface.Holotype ♂, Yushu County, Qinghai Province, July 13.1981, collected by Sun Baoye, paratypes 4 ♂♂, same as holotype.The types are deposited in the Health & Anti-Epidemic Station of Liaoning Province.

Miltogramma ( Cylindrothecum) curticlaws sp.nov.(figs 1-3) ♂:Body length 5.5-6mm.Eyes bare, similar to Miltogramma ( Cylindrothecum) ibericum (Vill., 1912).But differs from the latter with the new soecies body length 5.5-6mm, interfrontalia gold, palpi yellow, t ₂ 1 v, 1 pd, 1 p and.It is also quite different in the male Phallosome (as shown in the figures).Holotype ♂, Jianchang (Mt.Daheishan), Liaoning province, August 10,1995,collected by Liu Jie, aiiotype♀, paratype 7 ♂♂,5 ♀♀,same as holotype, the type specimens are preserved in the Health and Anti-Epidemic Station of Chaoyang, Liaoning Province.

One new blackfly, Simulium ( Gomphostilbia) laoshanstum sp.nov.were described on the female, male, pupal and larval specimens collected from Laoshan, Qingdao, Shandong province, China.All the specimens are kept in the Medical Entomology Collection Gallery, Academy of Military Medical Sciences, Beijing.This new species closely related to S.( G.) pingxiangense An and Hao, 1990 from Pingxiang, Guangxi province, China and S.( G.) ela Davies, 1987 from Sri Lanka and S.( G.) sundaicum Edwards, 1934 from East Java, however, it is clearly different from S.( G.) pingxiangense An and Hao, 1990, S.( G.) ela Davies, 1987 and S.( G.) sundaicum Edwards, 1934 by the structure of gonapophysis, genital fork, cibarium of the female and median sclerite, paramere of the male, by the branching of the pupal respiratory filaments and form of postgenal cleft in the mature larvae.Holotype ♀, paratype 3♂, 4 pupa, 3 mature larvae, Qingdao Laoshan, Shandong, 45m(36.3°N, 120.5°E) 18 May,1994.

The present paper deals with diversity of blood-sucking insects (mosquitoes and biting midges et al) by analysing the data obtained from most parts in China during 1987～1988.All the data were summarized in table 1～3.The results of the present study may be summarized into 2 main points: 1.The probability of interspecific encounter (PIE) index was lower in northern region than in southern region.2.The species numbers in southern region was more than that in northern region, and species′ dominant degree was higher in northern region than in southern region.

It was reported that 8 species of cockroaches were examined in urban environment of Guang province.The cockroaches infested 52.09% of all types of houses inevetigated, and Periplaneta americana was the most important species in the area.The distribution and living habits of cockroaches were also discussed.

Ixodoidea have been known 2 families 6 genera and 18 species in Ningxia.In Which 1 genera (Rhipicephalus Koch) and 4 species ( Ixodes persulcatus schulze, Ixodes ovatus Neumann, Hacmaphysalis concinna Koch, Rhipicephalus sanguineus Latreille) are new record, 141 ticks were collected in Liupan Mountain, 68.8% were Ixodes persulcatus schulze, which is the predominant species in above place.In accordancc with distribution on the faunisties and regionalization of insects, ticks in Ningxia are distributed on three insect regions (Ⅰ～Ⅲ) and three insect subregions(Ⅲ ₁～Ⅲ ₃).

The results of the epidemiological investigation showed that Leptotrombidium ( L.) subpalpale was distributed mainly in the focis of wild rat type HFRS, which was a dominant species in this area, the constituent rate was 60.34%.The density of larva was higher in November and December.It's geographic distribution was correlated with the HFRS cases distribution in the focis, and the Apodemus agrarius, main infections resources of HFRS, bore high 314.83 (November) and 239.75 (December) of chigger mite index.From the L.(L.)subpalpale larva collected from HFRSV antigen positive rats and from the L.(L.)subpalpale larva captured with small blackboards, and then bited the mice infected with HFRSV, we isolated one HFRSV strain for each, which confirmed that L.(L.)subpalpale be subject to HFRSV and that forms the determined factor for L.(L.)subpalpale as the vector of HFRS.

This article reported the isolation of Rickettsia tsutsugamushi ( Rt.) from Leptotrombidium palpalis in China for the first time.4 strains were obtained from 4 groups of chiggers (71-150 chiggers as a group).Enlargement of liver was observed in experimented mice inoculated with isolates, but the spleen′s enlargement was rarely observed.Serological identification of 4 strains revealed strong positive reaction with Rt.(Gilliam strain).More research was needed to confirm whether L.palpalis can act as a vector of Rt.from chiggers to rodents or from chiggers to men.