【Abstract】　Objective　To monitor the population density and seasonal fluctuation of mosquitoes in different areas in Hebei, and to provide the science basis for the reasonable control of mosquitoes. Methods　 Mosquitoes were collected by light trap method and landing count method. Results　There were six species caught, belonging to 3 genera. Culex pipiens pallens was the dominant specie, accounting for 85.34%. Cx.pipiens pallens was caught in the residential areas and park, Cx.tritaeniorhynchus and Anopheles sinensis in stable. The mosquitoes density was monitored by light trap method and landing count method, and its peaks lasted from July to September, but the peak was in August. The mosquito density was 10.33 individuals/lamp·h and 16.06 individuals/man·h  respectively.  Conclusion　It  should  put  the emphasis on the control of Cx.pipiens pallens, Aedes albopictus, Cx.tritaeniorhynchus and An.sinensis.

　　【Abstract】　Objective　To monitor the population density and seasonal fluctuation of flies at different areas of Hebei, and compare the trapping efficacy of different baits. Methods　Cage trapping method was used in this study. Results　A total of 19 species were caught, belonging to 4 families, 14 genera. Musca domestica was dominant specie. Muscidae were mainly trapped with putrid fish, accounting for 54.22% of the total. Muscidae and Calliphoridae were mostly caught with a mixture of brown sugar and vinegar, accounting for 39.17% and 36.08%, respectively. The season fluctuation tendency of flies caught with two baits was similar, and the peak was all in August.  Conclusion 　According  to  the  surveillance  data,  the  species  controlled  mainly are M.domestica, Chrysomya megacephala, Lucilia sericata, Boettcherisca peregrine and M.stabulans. Environment improvement and the reduction of bleeding sites are the basic measures to control fly density. The putrid fish is worthy to be recommended as a surveillance method of flies density.

　　【Abstract】　Objective　To monitor the population density and seasonal fluctuation of rodents in different residential areas of Hebei province. Methods　The night trapping method and powder trace method were used in this study. Results　There were 6 species caught, belonging to 2 families 4 genera. Rattus norvegicus was the dominant species (60.99%). Mus musculus, Apodemus agrarius, Tscherskia triton and Cricetulus barabensis followed with it, accounting for 25.30%, 9.38%, 2.89% and 0.48% respectively. The dominant species were different in different districts. The results showed that the peaks of population density were in April and October.  Different surveillance methods were used in Langfang, and the average population density of rodents was 0.87%  by night trapping method, but it was only 3.36% by powder trace method. It was 0.83% and 0.67% in Tangshan and Shijiazhuang, respectively. The population density in the country was higher than that in the town. Conclusion　R.norvegicus is the main control target in Hebei province.

Objective In order to obtain basic information of distribution of Dengue viruses vector mosquitoes:Aedes albopictus in north and northwest of Hebei province. Methods Investigation of mosquito larvae adopted small containers method; investigation of mosquito adults adopted mosq-ovitrap, mosq-lamp trap, electro-suction catch method. Results Ae.albopictus was discovered at Shexian county, container index(CI)=34.41, house index(HI)=25.27, breteau index(BI)=4.96. Conclusion Ae.albopictus was discovered at Shexian which is in southwest Hebei province, Ae.albopictus was not found in the city of Chengde in north of Hebei province and the city of Zhangjiakou in northwest of Hebei province.

Objective To investigate the fauna of genus Hydrotae in Hebei province of China. Methods Using entomogical classification principle and method. Results There are 15 species of genus Hydrotaea in Hebei province,which all destribute in Palaearctic and 5 species only in Palaearctic. Conclusion The species of genus Hydrotaea in Hebei province make up 30.00% of known Hydrotaea in China and have a Palaearctic distribution.

Objective To investigate species of the family Anthomyiidae in Hebei province of China. Methods Using entomogical classification principle and method. Results 66 species,22 genera,12 tribe,4 subfamily were recognized in Hebei province. Conclusion The species of Anthomyiidae in Hebei province make up 13.2% of known Anthomyiidae in China,5.5% of those in the world.