116 INSECUTOR INSClTli^ MENSTRUUS 



Aedes mimesis, new species. 



I propose the name mimesis for the unnamed form, since 

 both sansoni and vittata apply to the river-pool species, the 

 type being the male from Drummond, Montana, mentioned 

 below. The type number is 21553, U. S. Nat. Mus. 



The larva of mimesis will be the larva from Kaslo, Brit:sh 

 Columbia, which so closely resembles that of abfitchii. As to 

 the genitalia, I have a specimen from Drummond, Montana, 

 which differs distinctly from sansoni and comes very close to 

 palustris of California. This is entirely as it should be, sansoni 

 of the Rockies representing increpitus of the Sierras, while 

 mimesis of the Rockies represents palustris of the Sierras. 

 The genitalia runs as follows : 



Basal lobe of sidepiece conical, setose, with a stout seta on the inner 

 angle, but without a strong spine. Filament of harpago small, 

 sickle-shaped. 



Spines of basal appendages long palustris Dyar 



Spines of basal appendages moderate mimesis Dyar 



The habitat of mimesis appears to be more restricted than 

 that of sansoni. I encountered the species only at Drummond, 

 Whitehall, and Bozeman; a small series from Aweme, Mani- 

 toba (June 13-July 10, 1910, N. Criddle), are all mimesis; no 

 sansoni being present. 



Psorophora signipennis Coquillett. 



Three specimens, Laurel, Montana, July 15, 1917, biting 

 after sunset on the prairie. Previous records of this species 

 are from Mexico, Texas, and New Mexico. The present 

 record extends the known range considerably. 



Aedes vexans Meigen {sylvestris Theobald). 



Males were observed swarming after sunset at Big Timber 

 in the river bottom, in little open glades under willows and 

 on the dark side of bushes. The species is abundant, flying 

 both on the prairie and river bottom, though much more 

 abundant in the latter location. Larvas were found breeding 

 in temporary irrigation pools. 



Hatching experiments were not conducted with this 

 species, hut the inference is that part of the eggs will hatch 



