60 INSECUTOR INSCITI/E MENSTRUUS 



occupying about two-thirds of sixth and seventh segments, eighth wholly 

 white scaled ; lateral ciliation long and fine, pale yellowish. Wings 

 nearly as broad as in the female ; stems of fork-cells but slightly longer. 

 Claw formula, 1. 1 -1.1 -0.0. 



Length : Body about 4 mm., wing 4 mm. 



Matucana, Peru, 7,300 feet, June-July, 1913 (C. T. Brues). 



Types and paratypes in the collections of the U. S. National Museum 

 and of Dr. C. T. Brues ; one pair deposited in the British Museum. 

 Type. No. 18361. U. S. Nat. Mus. 



Male genitalia : Side pieces from above broadly conical, straight wath- 

 in, convex without, about twice as long as the greatest diameter, sparsely 

 covered with short hairs, a few long ones on the outer side and a row of 

 about seven long ones closely crowded in a line at the tip before the in- 

 sertion of the clasp filament. Beneath the inner area of the piece is cut 

 away to two-thirds of its base, but not any at the tip. The remainder 

 of the piece forms a ridge, elongate, about three times as long as wide, 

 deeply excavate on the inner side in the central third, regularly convex 

 without, the tip shortly truncate at the insertion of the clasp filament ; the 

 inner angle basally of the emargination is densely hairy, with distinct 

 tubercles ; beyond the emargination is a large dark chitinous cone, from 

 the outer aspect of which arise {\) a. heavy brov\Ti rod which expands 

 beyond the middle into a half-disk and ends in a digitate point, and (2) 

 a long thin leaf-like appendage, hardly widening outwardly, truncate at 

 tip, its inner and distal edges deeply dentate, spinose, its outer angle pro- 

 longed into a long point. Within the emargination of the under side of 

 the side piece is a broadly tricmgular lobe, its outer angle fitting into and 

 surpassing the emargination, dark and densely tubercular and bearing a 

 brush of densely crowded setae, especially long and dense at the angle. 

 This triangular lobe is joined by a membrane to a stout chitinous strip on 

 the inner side, at the termination of which are two spine-like rods, inserted 

 in tubercles, with pointed, slightly recurved tips. Clasp filament stout, 

 enlarged a little at the base, bent beyond the middle, where it becomes 

 a little inflated and creased ; tip slender, furcate, with two widely diver- 

 gent points. Harpes broad, triangularly rounded, the inner angle blunt 

 and bearing a dense crown of short spines ; outer angle forming a slender 

 recurved spiral. Harpagones small, plate-like, single, bearing three or 

 four stout curved teeth toward the tip. Unci small, narrow, with rounded 

 tips. No basal appendages. 



