194 
than the first posterior cell. Discal cell equal, fully three times as 
long as broad, slightly longer than the third posterior cell, its dis- 
tal extremity on a line with that of the supernumerary discal cell. 
Fifth posterior no broader than the discal cell. Stigma very faint. 
Length of wings, 9 mm. 
Florissant, Colorado. One specimen, No. 86. 
Cyttaromyia clathrata. 
Pla ee 8 
Wings more than four times as long as broad, the marginal cell 
more than one fourth longer than the breadth of the wing, its 
proximal not more than one fifth longer than its distal portion. 
Auxiliary vein terminating midway or at slightly less than midway 
from the origin of the third to the tip of the first longitudinal vein. 
Second longitudinal vein arising at or scarcely before the middle of 
the wing, pretty strongly arcuate at base, the prefurca only a 
little more than half as long as the remainder of the vein. Super- 
numerary discal cell long and slender, very slightly enlarging api- 
cally, considerably longer than the first posterior cell. Discal cell 
enlarging apically, almost four times as long as broad, about as 
long as the third posterior cell, its distal extremity lying consider- 
ably within that of the supernumerary discal cell. Fifth posterior 
broader than the discal cell. Stigma faint. 
This is the smallest species of the genus. 
Length of wings, 7.25 mm. ; fore femora, 5 mm.; fore tibiz, 6 
mm. ; mid tibiz, 5.75 mm.; hind femora, 5.25 mm. ; hind tibia, 
6 6mm. 
Florissant, Colorado. Three specimens, Nos. 3520, 8649 of my 
collection, No. 1510 U. S. Geological Survey. 
ORYCTOGMA (épuztés, dypos) gen. nov. 
I separate here a single species which seems to belong to the 
Cylindrotomini and to be most nearly allied to Cylindrotoma and 
Liogma, but which differs from them as from other living Cylindro- 
tomini in that the first longitudinal vein not only ends distinctly in 
the second, as in Cyttaromyia, Dicranomyia, and others, but is also 
connected apically with the costa by a cross vein as distinct as its 
own deflected apex, the apical portion of the vein appearing rather 
to fork and send one shoot in each direction. The disposition of 
