197 
Subcostal cross vein lying just before the origin of the second longitu- 
Ciittalliecy lilies wr appeate Ric chee taseark asst sie re Sslac eis i076 s-wie inferna. 
Subcostal cross vein lying at the tip of the auxiliary vein, beyond the 
origin of the second longitudinal vein.* 
Auxiliary vein ending at a distance beyond the origin of the second 
longitudinal vein equal to the width of the marginal 
cell. 
Great cross vein running in exact continuity with the basal 
portion of the anterior branch of the fourth longitudinal 
VEU ceieicins pic nas soe a Male iensLie a eects ares sts fragilis. 
Great cross vein striking the discal cell beyond the origin of 
the anterior branch of the fourth longitudinal vein. 
stigmosa. 
Auxiliary vein ending barely beyond the origin of the second lon- 
itu inalip VE MIs. ot aveinteientuekeiay<vckekhete maayempohotetiegs primitiva. 
Marginal cell as long as the breadth of the wing. 
Smaller species, the wings less than 6 mm. long.............. fontaine. 
Larger species, the wings more than 7 mm. long............... rostrata. 
Dicranomyia longipes. 
LENG Fh SES 7215 a 
This is one of the largest species of those found at Florissant. 
The auxiliary vein ends barely beyond the origin of the przfurca, 
but the position of the subcostal cross vein cannot be determined. 
The prefurca arises considerably beyond the middle of the wing, 
though nearer to it than in the other species having, like this, 
a marginal cell shorter than the breadth of the wing; the distal 
portion of this cell is of about the same length as the proximal, 
and it terminates by the abrupt descent of the first longitudinal 
vein upon the second. The discal cell is closed, and is much nar- 
rower apically than at base by the length of the third posterior 
cell. The legs are very long and slender. 
Length of wings (in largest specimen), 7 mm. ; fore femora, 5.5 
mm. ; fore tibiz, 6.25 mm.; fore tarsi, 62? mm.; mid and hind 
femora, 7.25 mm. 
Florissant, Colorado. ‘Two specimens, Nos. 214, 5582. 
Dicranomyia stagnorum. 
Pl. 2, figs. 4, 8. 
In this species, the most abundant in specimens known, the 
auxiliary vein terminates barely beyond the origin of the preefurca, 
* This is not quite certain as regards D. stiymosa, but appears to be the case. 
