OSTEN SACKEN ON WESTERN DIPTERA. 273 



Thorax deep velvet-black, with black, moderately long, erect pile ; pleu- 

 rae somewhat shining, and, in a very oblique light, slightly grayish polli- 

 nose. Abdomen moderately shining, beset with sparse black pile, which 

 is more dense on the under side and round the tip ; first segment pos- 

 teriorly with a fringe of white pile; some few white hairs on the side 

 of the second segment on its hind margin. Halteres dark brown,, the 

 stem yellowish-brown. Wings infuscated, but less so than in the other 

 species of the genus, darker along the anterior margin, the region of 

 the stigma dark brown ; brown clouds on the cross-vein at the base of 

 the fourth posterior cell and on the bifurcation of the third vein, but 

 both very little conspicuous ; second basal, anal, and axillary cells hya- 

 line; the fifth vein is margined with brown, the sixth is not. The hind 

 femora on the under side, besides the usual pile, have four or five stiff, 

 spine-like bristles. 



Hal). — Vancouver Island (G-. R. Crotch). 

 f 6. Epibates harrisi n. sp., $. — Black; thorax and abdomen clothed 

 with long, grayish-white pile; wings hyaline, anterior margin brown 

 (the root, costal, first basal, and marginal cells). Length 14 mm . 



Epistoma black, shining; occiput thickly clothed with grayish- white 

 pile. Thorax deep black, opaque, clothed with whitish-gray pile, sparsely 

 on the dorsum, more densely on the pleurae; the rigid, sharp points on 

 the dorsum are distinct. Abdomen cylindrical, black, with grayish-white 

 recumbent pile, rather uniformly spread over all the segments (on- the 

 hind margins of each of the segments 3-7 in the middle, there is a 

 small spot, denuded of gray pile, and therefore appearing darker black; 

 these spots are too regular to be an accidental denudation of the speci- 

 men, which is nevertheless possible) ; on the sides of the first four seg- 

 ments long, white, erect pile; on the sides of the following segments, 

 beginning with the fifth, a fringe of long, erect, black pile. Femora 

 black, with some white pile; tibiae and tarsi dark brown. Halteres yel- 

 lowish-white, with a brown knob. Eoot of the wings, costal, first basal, 

 marginal, and the proximal end of the first submarginal cells brown, 

 somewhat darker around the stigma and on the small cross- vein : the 

 remainder of the wing hyaline; veins brown ; anterior margin with dis- 

 tinct denticulations. 



A single male, in T. W. Harris's collection in the Boston Museum of 

 Natural History ; a label with H. Gray upon it. It is very probably 

 from the Northern United States, as nearly all the specimens of the 

 collection. 



7. Epibates NIGER Macquart, Hist. Nat. Dipt., i, 390, 2 (Apatomyza) ; 

 Dipt. Exot., ii, 1, 111, tab. xi, f. 1 [id,). 



" Length 4J lines. Black, with gray pile. Palpi reaching the tip of 

 the antennae; first joint elongated, cylindrical, hairy; the second a lit- 

 tle less long, glabrous, attenuated at the base and tip. Wings spotted 

 as in the preceding species (Wiedemann's Apatomyza punctipennis from 

 the Cape) ; anterior margin denticulate on its posterior half in the male." 



Hab. — Georgia. 



