DIPTERA— MYCETOPHILIDJ^:. 599 



which, beyond this point, has a gentle sinuous course, and diverges rather 

 strongly from the fourth ; the sixth vein can not be traced, although the 

 axillary field is broad, very much as in Diadocidia, and the inner margin 

 distinct 



Probable length of wing, 3.6™'"; its breadth, 1.45"""'. 



Green River, Wyoming. One specimen, No. 125 (F. C. A. Rich- 

 ardson). 



Mycetophilid^. spp. 



PI. 10, Fig. 12. 



Scudd.. Bull. U. S. Geo!. Geogr. Siirv. Terr., IV, 750-751 (1878). 



Three other species of Mycetophilida? occur among the specimens col- 

 lected by Mr. Bowditch and myself at Green River, Wyoming, but they 

 are indeterminable from their fragmentary condition. One of them. No, 

 4134 (PI. 10, Fig. 12), has indeed the remnant of a wing, but the portion 

 of the venation preserved is only sufficiently characteristic to enable us to 

 judge that it belongs in this family Tiie thorax is strongly arched, and the 

 full and tapering abdomen indicates a female. The head is gone. 



The thorax and abdomen are 3.5"°™ long, and the wing probably 

 3""" long. 



Another of them, from the same place, No. 4114, has a portion of the 

 base of a wing in which the forking of the fifth and sixth longitudinal 

 veins is very close to the base, as in Sackenia, but nothino- more can be 

 said concerning it ; the thorax is very globular and the abdomen short. 



Lengtli of thorax and abdomen, 3.65™"'. 

 - The third species is represented by two specimens on one stone (No. 

 4205) which came from the high buttes opposite Green River Station, and 

 is the only fly which had the slightest value found in four days' search at 

 that spot. One of the specimens is a pupa and the other an imago, apjiar- 

 ently of the same species and distinct from either of the preceding, with a 

 longer thorax and slenderer abdomen, provided with large ovate anal lobe.s. 



Length of thorax and abdomen, 5'"'". 



