DIPTERA— MYCETOPHILID^. 589 



Tetrag-oneura. The presence of a such a vein being doubtful, we have pre- 

 ferred to point out its affinity to Mycetophila. The radial vein ends in the 

 middle of the outer two-thirds of the costa, and at its tip a distinct stigma, 

 nearly three times as long as broad, occupies the space between the radial 

 and costal veins. The tip of the wing is broken on one specimen and 

 obscured on the other, so that the length of the costal vein can not be deter- 

 mined, although it appears to extend slightly beyond the tip of the cubital 

 vein ; the cubital is connected by the cross- vein to the radial but a short 

 distance from its origin, and bends but little upward from the median vein 

 to reach it ; the middle discal vein, on the contrary, bends downward con- 

 siderably, and foi'ks at a distance from the base, less than half-way from the 

 median cross-vein to the tip of the radial vein, and an unusually broad 

 space is left between its upper branch and the cubital vein, while the fork 

 of the hind vein is nearer the base than the separation of the cubital from 

 the median vein. 



Length of body, 3.5°"°; antennae, 1.1""; wings, S.S"" ; tibise (of fore 

 legs 1), 0.75°"" ; tarsi (of same legs), 0.4"". 



Chagrin Valley, White River, Colorado. One specimen. (W. Denton.) 



ANATELLA Winnertz. 



Anatella tacita. 



PI. 10, Fig. 13. 



A single specimen with damaged wings is referred here. The antennae 

 are as long as the thorax, slender, equal, covered with fine short hairs The 

 legs are long and slender, the tarsi apparently longer than the tibiae, the 

 latter armed apically with a pair of exceedingly long unequal spines, and 

 all the legs thickly clothed with rather coarse spinous hairs. Wings dusky, 

 the venation obscure, but apparently as in Anatella, there being no sign of 

 any auxiliary vein beyond the base, the stalk of the ujjper discoidal vein 

 apparently short and the fork of the lower a little further out than that of 

 the upper discoidal vein. 



Length of body, 4""; of antennae, 1.5""; of tarsi, 1.75""; of wing 

 (estimated), 3.2"". 



Green River, Wyoming. One specimen, No. 14. (Dr. A. S. Packard.) 



