588 TERTIARY INSECTS OF NORTH AMERICA. 



SCIARA SCOPULI. 

 PL 10, Fig. 1C. 



A little slab brought home by Dr. Packard has two flies upon it in close 

 proximity, one preserved on a dorsal, the other on a lateral aspect, The 

 venation in both is obscure, but they apparently belong to the Sciarina at 

 least. The head is rather small, the antennae are rather coarse, cylindrical, 

 equal, shorter than the thorax. Legs very long, exceedingly slender, the 

 tibia? without apical thorns, or rather without conspicuous thorns, all the 

 legs covered with excessively delicate aculiform hairs. Wings with only 

 two distinct veins, which run nearly parallel, not far from the front border, 

 and the second of which terminates a little above the middle of the tip, and 

 below it a deeply forked vein, apparently much as in Sciara proper. 



Length of body, 3.'25 mm ; of antennae, l mm ; of legs, 4.25 mm ; of wings, 



Omni 



Green River, Wyoming. One specimen, No. 2. (Dr. A. S. Packard ) 



MYCETOPHILA Meigen. 

 MYCETOPHILA OCCULTATA. 



PI. 5, Figs. 44, 45, 54, 55. 



Mycetophila occultata Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., Ill, 753 (1877). 



A single poorly preserved specimen and its reverse present an upper 

 view of the insect, with the wings folded over the back, the legs crowded 

 together, and the antennas lying beside the body. The antennae are about 

 as long as the head and thorax, the joints scarcely longer than broad, 

 nearly cylindrical, scarcely at all moniliform. The legs are comparatively 

 slender, hairy, and unarmed, not very long. The character of the venation 

 shows the insect to belong to the Mycetophilidse, but what genus is repre- 

 sented is somewhat obscure through doubt of the exact location of some of 

 the veins ; neither the auxiliary vein nor any of the basal veins above it can 

 be seen, nor can the axillary be traced; judging from the other veins, it is 

 probably allied to Mycetophila, although, in the possible presence of a 

 second cross-vein uniting the cubital veiu with the extremity of the radial, 

 it should be referred to a distinct genus, probably allied to Empheria and 



