OSTEN SACKEN ON WESTERN DIPTERA. 201 



probably S. punctipennis. On the figure of the wing which I gave (1. c, 

 tab. i, f. 20), the brown spot at the base of the praefurca is nearly in- 

 visible; this was an individual peculiarity of the figured specimen; 

 usually it is much larger. 



GoNiOMYiA sp. — A male specime from Lake Tahoe, July 19, is very 

 like G. suhcinerea^ especially in the venation (Monogr., iv, tab. ii, f. 4), 

 only the legs are darker, the halteres decidedly brown, the pleurae with 

 a distinct brown stripe, which is wanting in G. subcinerea. A female 

 from Saucelito, Marin County, Cal., April 2, is comparatively larger, 

 and has the wings slightly tinged with brownish. 



Section IV. — Limnophilina. 



LiMNOPHiLA TENUIPES Say, Osten Sacken, Monogr., iv, p. 210. — I 

 have two females from Lake Tahoe, July 19, which I cannot distinguish 

 from this species. 



LiMNOPHiLA LUTEiPENNis Osteu Sacken, Monogr., iv, p. 217.— Found 

 abundantly near San Bernardino, Cal., in March. I cannot find any 

 difference between these specimens and eastern ones. 



LiMNOPHiLA APRILINA Osten Sacken, Monogr., iv, p. 223. — A male 

 from Summit Station, Sierra Nevada, July 17, does not show any per- 

 ceptible difference from eastern specimens. A male and a female from 

 San Eafael, Marin County, Cal., April 13, have very dark brown and 

 well marked thoracic stripes; the coloration of the wings is much 

 darker, the spots along the anterior margin are larger ; that at the end 

 of the first longitudinal vein, for instance, almost coalesces with the 

 brown cloud at the base' of the first posterior cell. These specimens 

 may perhaps be considered a different species. 



LiMNOPHiLA MONTANA Osten Sacken, Monogr., iv, p. 227.— Two males 

 and a female from the Geysers, Sonoma County, California, May 5-7. 

 The specimens have become somewhat greasy, so that the coloring can- 

 not be compared with that of the eastern specimens ; the wings are ex- 

 actly the same. The male forceps shows the peculiar structure of the 

 subgenus Dactylolabis, to which the species belongs. 



LIMNOPHILA MUNDA Osten Sacken, Monogr., iv, p. 226. — Specimens 

 from San Eafael, Cal., May 14, and Sonoma County, May 5-7, resemble 

 this eastern species very much, but require a closer comparison. 



LIMNOPHILA ADUSTA Ostcu Sackcu, Monogr., iv, p 215. — Two speci- 

 mens from Webber Lake, Sierra County, seem to belong to this species, 

 or rather group of species. 



LIMNOPHILA DAMULA n. sp. — Gray; antennae black; wings spotted 

 with brown. Length 6-7™™. 



Rostrum, antennae, and palpi black; thorax gray, with faint brown 

 stripes; halteres whitish; abdomen brownish-yellow in the male, nearly 

 brown in the female; ovipositor yellowish ; legs yellowish-brown. Vena- 

 tion like that of a Bactylolabis (INIonogr., iv, tab. ii, f. 7) ; that is, 

 the first submarginal cell long, rather angular at the proximal end, its 



