INSECUTOR INSCITI.E MENSTRUUS 49 



third joints slender, smooth, upturned, the third with a few 

 short setae, all black-scaled. Antennae plumose, the last two 

 joints long and slender. Occiput clothed with appressed black- 

 ish scales, the margins of the eyes broadly white-scaled ; erect 

 forked scales on the nape brownish. Mesonotum dark brown, 

 thickly clothed with narrow curved bronzy-brown scales, the 

 submedian rows of black setse forming two darker lines. 

 Pleurae dull greenish with a few white scales. Coxae pale, 

 a little greenish. Abdomen subcylindrical, flattened, expanded 

 at tip ; dorsal vestiture deep black, slightly bluish, no dorsal 

 bands, a series of rounded white lateral spots, basally on the 

 segments, faint on the first four segments, distinct on the next 

 three ; ventral segments broadly black-scaled at apices, dull 

 whitish at bases, the colors suflFused, not sharply banded ; 

 lateral ciliation of weak, short recurved hairs, very slight. 

 Wing-scales black, the stems of the fork-cells short. Legs 

 rather long and slender, clothed with black scales ; femora 

 white beneath, narrowly so nearly to apex, no knee-spots ; 

 femora and tibiae with a very few black bristles. 



Length : Body, about 3 mm. ; wing, 2.5 mm. 



Female. — As in the male except palpi short, about three 

 times as long as the clypeus ; antennae with the joints sub- 

 equal ; abdomen with the white lateral spots larger, subtri- 

 angular, venter sordid white-scaled, only the last segment 

 marked with black. 



Length : Body, about 3 mm. ; wing, 2.8 mm. 



Type, Cat. No. 20304, U. S. Nat. Mus. 



Occurring rarely in the large pool described under erythro- 

 thorax. The pupae are very minute, even smaller than those 

 of Uranotcenia anhydor. The larva was not found. 



Culiseta incidens Thompson. 



The larvae were found in drainage pools in a canyon at the 

 north end of town. An egg-boat, taken from such a pool, 

 was bred to maturity. The males all emerged first, then the 

 females. There were about twice as many females as males 

 bred from this boat. 



