INSECUTOR INSCITI^ MENSTRUUS 3 



broken in the middle. Wing-scales dark, the costa, first and 

 third veins often appearing darker. 



Types, three males. No. 24953, U. S. Nat. Mus. ; Anchorage, 

 Alaska (3), June 11, 1921 (J. M. Aldrich) ; Camp 327, Alaska 

 Engineering Commission, Alaska (1), July 12, 1921 (J. M. 

 Aldrich). 



Also females as follovv^s : Anchorage, Alaska, July 21, 1921 

 (J. M. Aldrich) ; Hurricane, Alaska, July 15, 1921 (J. M. 

 Aldrich) ; Popofif Island, Alaska, July 8, 9, 11, 13, 16, 1899 

 (T. Kincaid). 



THE AMERICAN AEDES OF THE IMPIGER 

 (DECTICUS) GROUP 



(Diptera, Ctilicidce) 

 By HARRISON G. DYAR 



The species are here considered solely as they occur in 

 North America. It is probable that one or more of them are 

 the same as species occurring in north Europe, and if this is 

 established, it will effect a change in nomenclature, namely, 

 the sinking of lazarensis under communis DeGeer; but as the 

 American forms will doubtless remain as races, the change will 

 not be radical. The male hypopygium is not clearly diagnostic 

 of species in all cases, and does not define the races at all; 

 much the same condition existing as with the punctor group, 

 discussed heretofore (Ins. Ins. Mens., ix, 69-80, 1921). The 

 larvae are more characteristic, defining the species well. Two 

 series exist, the lazarensis series in which the male hypopygium 

 has the apical lobe of the side piece well haired, and the impiger 

 series, in which it is nearly bare. 



Series 1 

 Species 1 



Aedes (Ochlerotatus) prolixus Dyar. 



Acdes prolixus Dyar, Ins. Ins. Mens., x, 2, 1922. 

 Marked like normal eastern lazarensis, except that the bands 

 tend to fuse centrally. The genitalia are distinctive. The 



