14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



ment of the abdomen distinctly elevated above the hind coxae, so 

 that the sclerites above the latter (metathoracic epimerit of Hendel) 

 are completely united on the middle line, not separated by a mem- 

 branous portion as in other species. It differs from scyhalarixi in. 

 having the arista pubescent, not pilose, in much darker color, and 

 in other respects. 



Male.—Bliick in ground color, including femora; tibiae reddish 

 yellow, tarsi brownish yellow; palpi yellow with brownish apices; 

 frontal stripe very dark red with a glaucous reflection. Head dark 

 brown above, the frontal stripe narrowed upward, the parafrontal 

 portions wide, elevated in middle, with dense long slender bristles, 

 of which about half a dozen of the upper series turn out over the 

 eye, the lower ones being mesially directed. Parafacials reddish on 

 upper half along facial ridges, elsewhere with brown pollen. Vibris- 

 sal region with dense row of bristles. Antennae wholly black, third 

 joint less than twice the second, arista black, densely pubescent. 

 Cheek two-thirds as high as eye, which has a somewhat diagonal 

 position, the cheek with upturned slender hairs below, its posterior 

 half with long and mostly yellow hairs. Palpi infuscated and with 

 many black hairs beyond the middle, just before the middle the hairs 

 are yellow. Thorax with dark pollen and a median glaucous stripe 

 reaching the scutellum, on each side of this a partly double blackish, 

 subshining stripe ; scutellum glaucous on middle, connecting with the 

 thoracic stripe. Chaetotaxy: Acrostichal, only fine, erect hairs all 

 the way; dorsocentral, 2 hairlike anteriorly, about 3 bristles pos- 

 teriorly, the hindmost gradually larger; notopleural, 2; presutural, 

 1; supraalar, 2; postalar, 2; intraalar, 0; sternopleural, 0, 1; scutel- 

 lum, with 2 lateral pairs and an equally long apical pair close to- 

 gether. Pleurae with rather dense but slender long brownish hair, 

 Calypters brown, smallish, with fringe of dark yellow hair. Ptero- 

 pleural and all behind the sternopleura bare. Halteres with brown 

 loiob. 



Abdomen narrow, not much deflexed, shining brownish black, cov- 

 ered above and on sides with dense, erect, but rather short yellow 

 pile, which is more or less mixed with black close to tip; this pile 

 seems to cover the under side also. 



Legs with erect but not very long pile, which varies on the femora 

 from black to brown and a considerable admixture of yellow; front 

 tibiae with long black pile on outer side, middle and hind ones with 

 the same standing out all round; front tarsi with the three inter- 

 mediate joints short, of equal length; pulvilli blackish, claws black; 

 middle tibia with two anterodorsal spines beyond middle, two 

 posterodorsal, one flexor far down toward tip ; hind tibia with three 

 anterodorsal, three posterodorsal (one near base). 



