Biological Papers. 133 



NOTES ON SOME MOSQUITOES OF DOUGLAS COUNTY. 



By Chauncey Overman, University of Kansas, Lawrence. 



'^pOWARDS the latter part of the month of September, 1905, 

 -■- mosquitoes became so exceedingly numerous that the daily 

 papers referred to the "plague of mosquitoes," This condition was 

 due to the excessive rainfall and the warm weather which prevailed 

 throughout the month, conditions favorable to rapid propagation.. 



At the suggestion of Professor Hunter, several hundred were 

 collected, with a view of ascertaining the proportion of the Anoph- 

 eles or malaria-carrying genus. Of the total number collected, 150 

 were selected as representative, and were classified. All the speci- 

 mens were taken within two miles of the University and within 

 about the same distance of the Kansas river. The majority taken 

 were on rather low ground, although they were quite plentiful on 

 the University campus. About twenty per cent, were taken in 

 bedrooms. Most of the collecting was done with a cyanide bottle, 

 although a net was used on a few occasions. The period of col- 

 lection was from September 20 to December 6, 



During the early part of the season the proportion of males was 

 not more than five per cent., but after the first of November it in- 

 creased to fully thirty per cent. The distribution as to sex was as 



follows : 



Males, 19 12.66 per cent. 



Females, 131 87.33 



Total . . . 150 100.00 per cent. 



Distribution as to genus was as follows : 



Anopheles, 21 14 per cent. 



Culex, 129 86 



The number of species was distributed as follows : 



Genus Culex. 



C. pipiens Linn., 73 48.66 per cent. 



C. sollicitans Walk., 15 10.00 



C. consobrinus Desv., 13 8.66 " 



C. inconspicuous Grossbeck, 7 4.63 " 



C. restuans Theob., 5 3.00 



C. territans Walk., 5 3.00 



C. melanurus Coq., 4 2.40 " 



C. tarsalis Coq., 2 1.20 



C. perturbans Walk., 2 1.20 



C. stimulans Walk., 1 60 



C. impiger Walk., 1 60 " 



C. signif er Coq. ,1 60 " 



