102 INSECUTOR INSCITI^ MENSTRUUS 



Anopheles occidentalis Dyar & Knab. 



Anopheles larvae were common in protected spots around 

 the shores of Lake Whatcomb, Bellingham, Washington, May- 

 Si, 1917, The specimens were not bred, having been acci- 

 dentally left behind on a train in the hurry of making a quick 

 connection, but are presumably of this species. 



NOTES ON AEDES AT LAKE PEND D'OREILLE, 



IDAHO 



(Dipt era, Culicidce) 

 By HARRISON G. DYAR 



A brief stop was made, July 3-4, 1917, at Sandpoint, on 

 Lake Pend d'Oreille, and a trip taken to Sunnyside, an hour's 

 ride down the lake. The altitude is 2,096 feet above sea level. 

 The country is mountainous and well forested with conifers 

 down to the lake margin. The following species of A'edes 

 were taken : 



Aedes aestivalis Dyar. 



Seventy-three females and twenty-eight males. The meso- 

 notum is whiter than in typical aestivalis from Kaslo, British 

 Columbia, only a few being of the yellow color. This was 

 noticeable to the naked eye, for when the mosquitoes would 

 alight on dark clothing at dusk they looked like little flakes of 

 cotton. Under a lens, most are ash gray with a broad central 

 brown stripe, rarely narrowly divided on mesial line. There 

 is a sprinkling of white scales on the wing along costa and 

 subcostal vein. 



The genitalia as described in the monograph (vol. iv, p. 742) 

 should be slightly corrected. The basal lobe of the sidepiece 

 is not accompanied by a stout hooked spine, but by a group of 

 stiff setae the outmost of which is thickened and has a large 

 insertion, the spine not being fully differentiated as our de- 

 scription implies. The filament of the harpagone should be 

 described as angularly widened near base. The apical lobe of 

 the sidepiece is sparsely setose, being bare only at the tip on 



