148 



.ifosQrrroi'js 



rhiiius, have been studied by iiivi'sti gators working upon 

 the transfer of blood-inhal)itins' i)arjisitic germs by nios- 

 fpiitoes, and I have urged that physieians and bacteriol- 

 ogists in our S(jutlu'rn States pay souk^ attention to tlieni 



from this point of view. 



Xotliiug- was known 

 about the early stag-es of 

 Psoroi)liora until the end 

 of August, 1900. In the 

 early ])art of the summer 

 (ill -luiie). a larg'e series 

 of living- specimens was 

 captured at St. Elmo, Va., 

 by one of my assistants, 

 Mr. F. 0. Pratt, and we 

 expected that we should 

 be able to secure eggs 

 without diihculty and to 

 study the insect in its dif- 

 ferent stages. The femah'S 

 were jtjaced aliv(> in large 

 battery jars, under condi- 

 tions which had rei)eatedly 

 been successfnl w ith nu^scpiitoes of the genera Cnlex and 

 Anoi)heles, bnt no eggs were deposited. 'I'his Itronght 

 me to tlu^ concbision that either the confined specinn-ns 

 were not impregnated or that they had already de|)osited 

 all their eggs, or that their biceding lial)its ditler from 

 those of othei- moscpiitoes. On August ;5(lth some very 

 large mosquito larvae and pupie were received from Mr. 



Fic. 10. -"^'diiMU' Larva nt' J'somph- 

 orii cilidtd : (■iil;n_i;v(l. (Aulliur's 

 illusliatioii. ) 



