248 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



brown. Venation in general as in the Florissant (Miocene) G. pri- 

 mogenitalis Scudder, but discal cell much longer. The second basal 

 cell is longer than the first, as in G. hryanti Alexander, from Java ; 

 but the wing differs from G. hryanti, and agrees with the American 

 G. sulphureUa Osten Sacken, in the base of the submarginal cell. 

 The following measurements are in microns: first basal cell on first 

 marginal, 1550; length of discal cell, 910; second posterior on thu-d 

 posterior, 1040. 



Tyi^e. — U.S.G.S. 82. Roan Mountain, Colorado (Scudder collec- 

 tion). 



Holotype.— Cat. No. 66568, U.S.N.M. A stout-bodied fly, with 

 four black bristles on the scutellum, and the abdomen not bristly, 



but extremely delicately pilose, is so 

 placed that the above wing looks as if 

 it were attached to it. The actual 

 wings belonging to the body are lost. 

 Williston and Needham write Goni- 



omyia, but Gonomyia is the original 



Fig. 5.— Gonomyia scudderi. Wixa. sDellinff 



CYTTAROMYIA FENESTRATA Scudder. 



Type. — U.S.G.S. 1095. White River, Colorado (Scudder collec- 

 tion). The wing is 9 mm. long. The original type came from 

 Wliite River, Utah. 



Family CULICIDAE. 



CULEX WINCHESTERI Cockerell. 



Plate 35, fig. 2. 

 Culex winchesteri Cockerell, Nature, March 20, 1919, p. 44. 



Female, 5.2 mm. long; wing about 4.2 mm.; proboscis 3 mm., 

 distinctly curved; palpi about .4 mm.; thorax about 2 mm. long; 

 abdomen stout, its apex obtuse. 



Tyjye. — U.S.G.S., Winchester 17-3. Shales back of house at 

 Smith's Ranch, in the vicinity of Cathedral Bluffs, Colorado. 



Hohtype.—C'^t. No. 66569, U.S.N.M. 



Family MYCETOPHILIDAE. 



DIOMONUS PALAEOSPILUS, new species. 

 Plate 34, fig. 5. 



Length about 7.85 mm.; length of wing 7.6 mm., the dark spot 

 3 mm. from base; head small, its width slightly over 1 mm.; thorax 

 large, about 2.65 mm. wide; antennae cylindrical, the joints much 

 longer than wide. Head and thorax dark brown (probably nearly 



