148 



MOSQUITOES 



rhinus, have been studied by investigators working- upon 

 the transfer of blood-inhaljiting parasitic germs by mos- 

 quitoes, and I have urged that physicians and bacteriob 

 ogists in our Southern States pay some attention to them 



from this point of view. 



Nothing was k n o w n 

 about the early stages of 

 Psorophora until the end 

 of August, 1900. In the 

 early part of the summer 

 (in June), a large series 

 of living specimens Avas 

 captured at St. Elmo, Va., 

 by one of nw assistants, 

 Mr. F. C. Pratt, and we 

 expected that we should 

 be able to secure eggs 

 without difficulty and to 

 study the insect in its dif- 

 ferent stages. The females 

 were placed alive in hirge 

 battery jars, under condi- 

 tions which had repeatedly 

 been successful with mosquitoes of the genera Culex and 

 Anoi^heles, but no eggs were deposited. This brought 

 me to the conclusion that either the confined specimens 

 were not impregnated or that they had already deposited 

 all their eggs, or that their breeding habits differ from 

 those of other mosquitoes. On August 30tli some very 

 large mosquito larvie and pupae were received from Mr. 



¥nr. 40. — Youdsj: Larva of Psoroph- 

 ora ciliaia ; enlari;cnl. (AuIIkji's 

 illustration.) 



