SIMULIUM. 33 



Basal fringe of abdomen pale yellow, surface hairs on segments 

 sparse, pale, longer on apical segments, and more numerous. Legs 

 with pale pilosity, hairs brown, shorter, and not so numerous as in 

 hlvittatum, the paired apical hairs on first and third joints of fore 

 tarsi shorter than in that sx3ecies ; claws simple. 



Length, 1-1.5 mm. 



Three females, Las Cruces, N. Mex., June 25, 1895 (T. D. A. 

 Cockcrell). These are the specimens on which the record of ochra- 

 ceinn "Walker is based in Entomological News for 1897, page 100. I 

 have not seen the specimens upon which the record at page 172 of 

 the same volume of that publication was based, but they probably 

 belong either* to this species or to hivittatum,. 



Male. — Brown. Face white-dusted, antennae brown, paler on basal 

 t wo joints, palpi brown. Scutum opaque, evenly covered with whitish 

 gray pollinosity ; prescutum and adjoining margin of scutum yellow; 

 pleura? brownish yellow, whitish pollinose ; scutellum yellow, margins 

 of scutum adjoining scutellum and laterally brown; postscutum 

 brown, with whitish pollinosity. Abdomen yellow, with dorsum of 

 segments 1-2 narrowly, and remaining segments broadly blackened, 

 apical three segments broadly silvered on sides. Legs yellow, browned 

 on fore tarsi, mid and hind coxae, apical two joints of mid tarsi, apices 

 of femora and apices of tibia? of hind legs (hind tarsi broken off in 

 specimen) ; claws trifid. Wings clear, thick veins yellow, venation 

 normal. Halteres bright yellow, base of stalk darkened. 



Eyes with upper facets very large, with lower facets very minute, 

 hairs on face and palpi pale, postocular cilia weak, pale. Scutum 

 with close-lying, whitish-yellow, hair-like, regular pilosity, which 

 is longer in front of scutellum; pleural tuft wliitish; scutellum with 

 white pilosity and longer, upright, white hairs. Abdominal basal 

 fringe pale yellow, hairs on segments sparse, of moderate length, 

 white. Legs with sparse, pale pilosity and scattered, longer, pale 

 hairs; fore tarsi not distinctly thickened, the apical paired hairs 

 weak; hind femora and tibia? broad; hind tarsi broken off, but un- 

 doubtedly possessing the normal characters of Slmidlum. 



Length, 1 mm. 



Locality: AA'illiams, Ariz. (H. S. Barber), one male. 



It ma}^ be that this is really a distinct species from the female 

 described herewith, but there are so many points of agreement that I 

 have decided to consider it as the male of notatum rather than describe 

 it as new, as I was at first tempted to. The only point which causes 

 me to doubt the safety of this course is the absence of any indication 

 of the Avhite pollinose spots on the scutum, which, if the general rule 

 holds with this group, ought to be even more distinct in this sex than 

 in the female. 



10125°— 14 3 



