7 



excriicians Walker. 

 fasciatus Fabr. 



fraier Desv. 



niosqiiUo Desv. 



taeniatii!^ Wied. 

 impiger Walker. 



unplacabili'i Walker. 



incidens Thomson. 



? rjuinqnefascintvs Say. 

 perturbans Walker. 

 posticalus Wied. 



? me.vicanus Bellardi. 

 mufiicus Say. 

 pungens'Wied. 



? boscii Desv. 



? ciibensis Bigot. 



? terrifans AValker. 

 sigaifer Coquillett. 

 stimulans Walker. 



? lyi'ovocans Walker. 

 taenm'hynchus Wied. 



damnosns Say. 



solUcitans Walker. 

 tarsalis Coquillett. 

 triteriatus Say. 



IV. — Genus Psorophora. 



Our single species is of a yellowish tolor. usually varied with 

 brown, the bases of the tarsal joints white. It is considerably larger 

 than any of our other species of yellowish or brown mosquitoes: 



ciliaius Fabr. 



conterrens AValker. 

 moJestns Wied. 

 ? rubidu-s Desv. 



V. — Genus Megarhinus. 



Our three species are among- th(' largest in this family, and are not 

 known to occur north of the District of C\)luml)ia. They may be 

 separated as folloWs: 



All tarsi marked with wliite riUila Coq. 



Hind tarsi alone marked with wliiti- i>ur(oricemis Roeder. 



None of the tarsi marked with white lurmorrJioidalis Fabr. 



VI.- — Genus Aedes. 



Our two species are among the smallest of our mosquitoes, and 

 haye a pale brownish ground color. They may he distinguished as 

 follows: 



Thorax marked with a median violet blue stripe sappJiirimis O. S. 



Thorax destitute of such a stripe fuscus O. S. 



o 



