200 
spoken of the marginal as the subcostal cross vein. The specimen 
described by me as Zipula tecta certainly belongs to the Limno- 
binz, and is most probably referable to this species. 
Lower White River, at the boundary between Colorado and 
Utah. 
Dicranomyia primitiva. 
Dicranomyia primitiva Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., iti, 748 
(1877); Zert. Ins. N. A., 570-571, pl. 5, figs. 20, 21, 65-67 (1891). 
The auxiliary vein in the only well-preserved specimen of this 
species is excessively faint, but appears to terminate barely beyond 
the origin of the preefurca and the subcostal cross vein to be at its 
tip. I have accordingly placed it in the table next D. fragilis and 
D., stigmosa. 
Lower White River, at the boundary line between Utah and 
Colorado. 
Dicranomyia fontainei. 
JENS yy ie, Li 
This is one of the smallest of. the Florissant species, and differs 
from all the others in having the marginal cell as long as the breadth 
of the wing. The auxiliary vein is also much longer than in the 
others, extending far beyond the origin of the preefurca and ap- 
parently, though this is obscure, with the subcostal cross vein at its 
tip. Further, the first longitudinal vein falls upon the second at a 
slighter angle, giving the marginal cell an unusually pointed tip. 
The preefurca arises not very far beyond the middle of the wing, 
and the distal portion of the marginal cell is not much more than 
half as long as the proximal. The discal cell is closed, though the 
cross vein separating it from the third posterior cell is very faint, as 
is also the great cross vein, which appears to strike the inner lower 
angle of the discal cell. The second and third posterior cells are 
subequal, the second slightly the longer. ‘The legs are poorly pre- 
served on the two specimens known, but the hind femora appear 
to be somewhat shorter than the wings. 
Length of wings, 5.5-5.75 mm. ; hind femora, 5 mm. 
Named for Prof. W. M. Fontaine of the U. S. Geological 
Survey. 
Florissant, Colorado. Two specimens, Nos. 173, 13715, the 
latter partly overlying a specimen of D. tnferna. 
