274 A. L. MELANDER. 



Anteniiffi very short; first -two .joints sbort, yellowish; the third joint globose, 

 black ; the terminal short style black, its basal joint thick, its apical joint slen- 

 der. Proboscis very short, thick, blunt, blackish brown ; palpi minute, recurved, 

 dirty white. Thorax black, cinereo-pollinose, opaque, clothed with pale hairs. 

 Scutellum concolorous. Abdomen black, shining, with pale hairs; hypopygium 

 concolorous. Legs fuscous, the apex of the coxae, the very base of the femora, 

 and the knees often luteous. Knob of the halteres subfuscous. Wings whitish, 

 veins pale, no stigma. 3.3-3.5 mm. 



Yukon River (Kennicott); South Dakota, Idaho, Wyoming. 



These specimens exhibit in addition the following characters : 

 The eyes of the males are large, occupying nearly the whole head, 

 the upper facets large, the lower very small, the two sizes of facets 

 well- separated on a horizontal line. The abdomen of the male is 

 more shining than in the female (of both sexes the base is almost 

 translucent) ; the hypopygium is terminal, of moderate size, consist- 

 ing of two convex, shining, side- pieces, and a dorsal short, back- 

 ward-pointing, curved process. The head and thorax have a slight 

 but distinct metallic tinge beneath the pollinous coating. The 

 wings are broader, shorter and blunter than in bullata ; the costal 

 cell is well filled with brown. Lastly, the pulvilli are of dusky 

 color and of normal size. 



Horiuopeza bullata sp. nov. (Fig. 88). 

 Female. Length 4.5 mm. — Head and thorax opaque black, abdomen shining 

 black. Eyes widely separated. Antennje a little more than one-third the eye 

 height, stubby, black, third joint somewhat velvety, swollen, longer than broad, 

 with a short, thick bristle. Palpi short, directed forward, luteous. Proboscis 

 short, thick, black, in length one third the eye height. Postocular yellow bris- 

 tles serially arranged. Thorax opaque-black, with a light cinereous or yellow 

 tinge; bristles yellow, acrostichals and pan of dorsals small, others long; scutel- 

 lum with six long bristles, the apical pair of which are not close together. 

 Pleurse lightly cinereous-dusted. Abdomen compressed, shining black, with 

 scattered, pale, short hairs; venter rufous to black. Coxae and legs yellowish, 

 uniformly colored, except the dusky tarsi; legs slender, tarsal joints oblong, 

 gradually decreasing in length, four pairs of bristles on the hind tibiae, hind 

 femora with longest bristle-like hairs on the outer side near the tip, middle and 

 front tibiae with a few small bristles, pulvilli enlarged, pale yellow. Halteres 

 yellow, dusky at extreme tip. Wings narrow, clear hynline, nervures pale, 

 brownish along co.sta, no stigma, anal angle prominent, costal cell opalescent. 



While this species closely resembles brevicornis, its habitus is so 

 different as to render it easily distinguishable. The larger size, the 

 narrower, longer, more pointed wings, the large pulvilli, the oval 

 third joint of the antennae which also are a little longer, the opales- 

 cent costal cell, the opaque velvet black of the head and thoracic 



