INSECUTOR INSCITI^ MENSTRUUS 23 



Still be identical (males and larvae of some unknown) though 

 most are plainly distinct, and of one pair (impiger and ven- 

 trovittis) I am not sure of the correspondence. 



Canadian representative. Calif ornian representative. 



Aedes punctor Kirby Aedes hexodontus Dyar 



lasarensis F. & Y. tahomsis Dyar 



pionips Dyar (unrepresented) 



impiger Walk, (decti- ventrovittis Dyar 



cus H., D. & K.) 



prodotes Dyar cataphylla Dyar 



intrudens Dyar fisheri Dyar 



diantaeus H., D. & K. (unrepresented) 



pullatus Coq. (unrepresented) 



Of the excrucians group, the two Californian species, m- 

 crepitus Dyar and palustris Dyar, are representatives of 

 mutator Dyar and m^imesis Dyar of the arid region, not of the 

 three species of the Canadian one. The ubiquitous vexans 

 Meigen and cinereus Meigen occur in both, the latter also in- 

 vading the Coastal fauna to some extent. Besides the strictly 

 prairie species, canadensis Theob. is really an intrusion in the 

 Canadian fauna proper, and its absence from the Californian 

 mountains is reasonable. Culiseta, Culex and Anopheles are 

 entirely oblivious of these regions, their distribution depend- 

 ing upon other factors. 



Aedes cyclocerculus, new species. 



Female : Head brownish yellow scaled, dull whitish on the 

 sides ; mesonotum brownish yellow scaled, whitish around the 

 antescutellar space ; two diffused dark brown median bands ; 

 posterior-lateral stripes broad, black-brown, distinct. Abdo- 

 men with basal segmental white bands, widening at the sides ; 

 venter whitish-scaled, the segments black-scaled on the sides. 

 Legs black, femora white below ; knee-spots white. 



Male : Ground-color scales lighter yellow and sparser than 

 in the female, the dark markings broad. White abdominal 

 bands narrow ; ventral scaling mixed with black. Genitalia : 

 Side pieces over three times as long as wide, the clasp with 



