324 A. L. MELANDER. 



Einpis nodipes sp. nov. (Fig. 143). 

 Male. Length 6.5 mm. — A slender species. Cinereous, plumbeous. Eyes 

 maroon-colored, separated as narrowly as the posterior ocelli, facets moderately 

 small; palpi small, fuscous, with one short subapical black hair; proboscis 

 scarcely one and one-half times the head-height, reddish, the black labella not 

 reaching to the tip; antennae slender, shorter than the head-height, black, pice- 

 ons at the base, first joint over two times the length of the second, third joint 

 three times the length of the. first, lanceolate, the arista as long as the first joint; 

 bristles of the occiput sparse, minute, in two transverse series. Thorax plum- 

 beous gray, the dorsum with four narrow brown vittse, the outer much abbrevi- 

 ated anteriorly; the intervittal bristles minute, the marginal macrochteta^ short, 

 few in number; four short bristles in the row in front of the halteres, pronotal 

 bristles wanting (broken ?) ; but two small scutellar bristles. Abdomen slender, 

 cinereous, opaque, witliout macrochfetie ; hypopygiura small, closed, central fila- 

 ment much swollen at base, the basal part exposed, remainder hidden, middle 

 lamellae convex, shining, truncated above, hiding the small upper lamellse. Legs 

 including the coxae yellow, slender, tips of trochanters and of femora minutely 

 black, taisi brownish toward ti]), tarsi slender, long, spinose beneath, metatarsi 

 not thickened, macrochaetae of legs moderate; trochanters unarmed ; hind femora 

 swollen near the tip, the outer infei-ior angle of the swelling with a fringe of 

 black bristle-like hairs; hind tibise with a similar swelling near its base, but cili- 

 ate on both sides with black hairs, hind tibiae on inner side at the tip fimbriate 

 with short yellow scales; hind femora not reaching the hypopygium, scarcely as 

 thick on basal portion as the apical part of the tibiae. Halteres pale yellow. 

 Wings subhyaline, veins thin, dark fuscous, stigma obsolete; third vein furcate 

 before the tip of the marginal cell, the posterior branch ending beyond the tip 

 of the wing ; the first section of the front border of the disc.al cell one-fourth the 

 length of the second ; second posterior cell very narrow at its base; no long cos- 

 tal bristles. 



A single male ; Magdalena, New Mexico. 



Einpis serperaslrorum sp. nov. (Figs. 136, 145). 

 Length 6-7 mm. — Olivaceous gray species of exceedingly great variability in 

 the color of the appendages. Palpi reddish to black, with a few hairs; proboscis 

 wholly black, sometimes reddish on basal part, labella never exceeding the pro- 

 boscis in length. First antennal joint two times the length of the second. 

 Occipital bristles sparse, or dense ; thoracic bristles sparse; scutellum with two 

 small widely separated bristles, females often with four; the row in front of the 

 halteres consisting of from three to five small bristles. Hypopygium small, ter- 

 minal, not higher than the abdomen, or sometimes slightly larger, upper lamellae 

 concealed, central filament flat exteriorly, completely hidden, the tip not expla- 

 uate. Legs including the coxae wholly black, or wholly yellow, except the 

 darkened tarsi, rather stoutish ; the hind femora reaching the tip of the abdo- 

 men in the female, but comparatively shorter in the male; the hair-like bristles 

 rather dense on the front metatarsi and on the outer portion of the hind tibiae of 

 the male; all the parts of the female leg slender; of the male the front meta- 

 tarsi are swollen slightly beyond the thickness of their tibiae, the remainder of 

 the legs, except the hind knees, simple; hind femora widened laterally on the 



