570 TEETIAEY INSECTS OF NORTH AMERICA. 



Another specimen is a female, with remnants of wings, having most of 

 the veins scarcely traceable ; enough of the right wing remains to be sure 

 that it is this species, with which the size agrees. 



Fossil Canon, White River, Utah (W. Denton.) 



Still another is similarly preserved ; but on account of the partial 

 folding of the wing no stigma can be seen, and the first longitudinal 

 vein seems to unite, or almost unite, with the second so far from the 

 branching of the latter that I was at first inclined to separate it; but the 

 difference proves to be very slight. The antennae of this specimen are 

 pretty well preserved, but so bent as not to allow of direct measurement; 

 the size agrees well with other specimens, although it is slightly smaller 

 than the second specimen mentioned, which, however, is rather larger than 

 the average. The specimen is a female. 



Fossil Canon, White River, Utah (W. Denton). 



A head preserved on the same stone as the last specimen probably also 

 belongs to this species. 



In the last specimen to be mentioned we have the upper surface of an 

 abdomen of a male Dicranomyia, apparently of this species, twisted so as to 

 present a lateral view of the tip, showing the structure of the under surface 

 of the appendages. The under inner edge is evidently thickened, and a 

 slight hook projects a little beyond the broad lobe; as the lobe itself is pre- 

 served in a different view from what holds in the other specimens, and there- 

 fore has a slightly different contour, the specimen is judged to belong to this 

 species only from the size of the abdomen and of its anal lobes. 



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



DICRANOMYIA PRIMITIVA. 



PI. 5, Pigs. 20, 21, 65-67. 



Dicranomyia primitiva Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., Ill, 748(1877). 



Two specimens, a little smaller than D. stigmosa, but still more closely 

 resembling D. pubipennis, together with a third, which is simply a body, to 

 which is attached the costal outline of a wing, and near which lies a leg, 

 represent the female of this species. The two first mentioned are rather 

 iaintlv preserved, but permit the venation to be traced with certainty. 

 lliuiigh with difficulty, and with one of them a portion of a detached (mid- 

 dle or hind) leg may be seen. The neuration of the wing differs from that 



