193 
shorter than the third posterior cell. Fifth posterior cell of equal 
width with the discal cell. Stigma normal. 
This species is of about the size of the preceding. 
Length of wings, 8.75 mm. ; fore femora, 5.5? mm. ; fore tibiz, 
6.5 mm.; mid femora, 4.75 mm.; mid tibiz, 5.75 mm.; hind 
femora, 5.5 mm. ; hind tibiz, 6.5 mm. 
Florissant, Colorado. Five specimens, Nos. 345, 7381, 7591, 
13051; and from the Princeton collection No. 1.770. 
Cyttaromyia oligocena. 
JEM Siler ee 
Wings scarcely more than four times as long as broad, the mar- 
ginal cell more than one fourth longer than the breadth of the wing, 
the proximal nearly one half longer than the distal portion. Aux- 
iliary vein terminating beyond a point midway between the origin 
of the third and the tip of the first longitudinal vein. Second 
longitudinal vein arising at the middle of the wing, the prefurca 
- about one fourth shorter than the remainder of the vein. Super- 
numerary discal cell broadening a little apically and as long as the 
first posterior cell. Discal cell equal, three times as long as broad, 
its distal extremity lying considerably within that of the supernu- 
merary discal cell, a little shorter than the third posterior cell. Fifth 
posterior broader than the discal cell. Stigma normal. 
This is the largest species of the genus. 
Length of wings, 9.65 mm. ; fore femora, 5.25? mm. ; fore tibiz, 
5-75 mm.; mid femora, 5.52? mm.; mid tibiz, 6.25 mm.; hind 
femora, 6.25 mm. 
Florissant, Colorado. One specimen, No. 13259. 
Cyttaromyia cancellata. 
Py nes ye 
Wings slightly less than four times as long as broad, the marginal 
cell nearly one third longer than the width of the wing, its proxi- 
mal fully a third longer than the distal portion. Auxiliary vein 
terminating somewhat short of a point midway between the origin 
of the third and the tip of the first longitudinal vein. Second 
longitudinal vein arising slightly before the middle of the wing, the 
prefurca almost as long as the remainder of the vein. Supernu- 
merary discal cell very slender, gently broadening apically, longer 
PROC. AMER. PHILOS. SOC. XXXII. 143. y. PRINTED JAN. 10, 1894. 
