218 A. L. MELANDER. 



ments of female abdomen not shining:, with fuscons hairs, styles short. Coxse 

 black, front ones anteriorly and middle ones on outer surface with whitish hairs 

 and bristles; all femora black, except reddish at knees; middle femora moder- 

 ately thickened, front femora less, hind ones not at all; tibife reddish, spur on 

 middle ones moderate; tarsi blackish, except dusky at extreme base. Wings 

 hyaline, with faint brownish tinpje; veins strong, fuscous, anal vein usually obso- 

 lete at base ; second basal cell the longer, its outer vein oblique, first posterior 

 cell broadest in the middle, converging towards ends. In the female there is 

 usually a coalescence for a greater or less distance of the costa and first longitu- 

 dinal. Length 2-2.25 mm. 



Sixteen males and eleven females; San Diego Co., California, 

 March. 



Seven specimens from Juliaetta, Idaho, appear to belong to this 

 species. The veins are weaker, the legs less strongly black, and the 

 palpi dusky. One female; Albion, Idado (J. M. Aldrich). 



Platypalpiis apicalis Loew. 

 Cent. V, 79. 



Black, shining. Head less shining, face closely white pollinose. Antennae 

 black, the third joint short ovate, the base narrowly luteous. Proboscis black; 

 palpi whitish. Side margins of the thorax and the pleurae very obsoletely white 

 pollinose, moderately shining. Abdomen shining. Legs, together with the 

 coxse, yellow, the last tarsal joint black, front and hind femora above marked 

 with an ovate black spot; front femora moderately thickened, middle femora a 

 little thicker than the front ones, with short black hairs below ; the apical tooth 

 of the middle tibiae short. Wings hyaline, veins fuscous, toward the base yellow- 

 ish, the third and fourth longitudinal veins parallel ; first basal cell equal to or a 

 little longer than the second ; the posterior basal cross-vein complete ; sixth vein 

 abbreviated toward the base. Length 2.2 mm. 



Pennsylvania. Common at Wood's Holl, Mass. 



Platypalpus diversipes Coquillett. 

 Proc. Wash. Acad. Sci. vol. ii, 1900, p. 422. 



Black, palpi and halteres whitish, legs yellow, bases of coxae, upper side of the 

 front femora, broad apices of the other femora, of tibiae, and whole of tarsi, except 

 base of first joint, black; third joint of the antennae only slightly longer than 

 broad ; front femora considerably thickened, about two-thirds as thick as the 

 middle ones; first and second basals subequal, veins yellowish brown. Length 

 1.5 mm. 



Alaska (Kincaid). 



Flatypalpus incultiis Coquillett. 

 Proc. Nat. Mus. 1896, p. 439. 



Black, shining, including the pleurae. Front coxae yellowish, others black ; 

 front and middle legs yellowish, upper and lower sides of femora blackish brown ; 

 tarsi and hind legs, except bases of tibiae, blackish brown ; front femora slightly 

 thicker than the others, middle femora scarcely as thick as the hind ones; legs 



