198 
and the subcostal cross vein lies as much before that origin as 
a little more than half the width of the marginal cell. The 
prefurca arises at about three fifths the distance from the base of 
the wing to the tip; the marginal cell is distinctly shorter than the 
breadth of the wing, its distal portion almost as long as the proxi- 
mal. The first longitudinal vein descends obliquely but with some 
abruptness upon the second. The discal cell is closed, broadest 
apically, the second and third posterior cells of equal length, and 
the great cross vein strikes the lower inner angle of the discal cell. 
The legs are long and very slender, and the tarsi show the peculiar 
arcuation of the apical joint characteristic of Dicranomyia; the 
tibize have no spurs. 
One specimen (No. 3683) has the discal cell open and contin-’ 
uous with the third posterior cell; in others the cross vein closing 
the cell is weak. 
Length of wings, 5-6.5 mm., aver. 5.5 mm.; fore femora, 4.75 
mm. ; tibia, 5.6 mm.; tarsi, 6.5 mm.; mid femora, 5.2 mm.; 
tibie, 5.25 mm. ; tarsi, 5.75 mm.; hind femora, 5.5 mm.; tibie, 
6.25 mm.; tarsi, 5.5 mm. ‘The leg measurements are from the 
smallest specimen. 
Florissant, Colorado. Thirty-one specimens, Nos. 60, 73, 223, 
581, 710, 774, 779, 808, 982, 1486, 2687, 2927, 3683, 6273 and 
6416, 8439, 8472, 8751, 8865, 8904, 9127, 9626, 9665, 10268, 
12230, 12612, 12760, 13043, 13684 of my collection ; Nos. 1.727, 
1.791 of the Princeton collection; No. 1512 U. S. Geological 
Survey. 
Dicranomyia inferna. 
TAB tis aired BY 
Here the auxiliary vein terminates a very short distance beyond, 
and the subcostal cross vein lies at an equal distance before the 
origin of the preefurca, which arises beyond the basal two fifths of 
the wing. The marginal cell is short, considerably shorter than 
the breadth of the wing, and the distal portion considerably shorter 
than the proximal. The first longitudinal vein descends with 
considerable abruptness upon the second, which curves gently 
upward to meet it. The discal cell, which is closed, is slightly the 
broadest apically, and the second and third posterior cells are of 
equal length. The legs are long and slender, but in no case very 
fully preserved ; they are relatively a little shorter than in the two 
preceding species, the hind femora being shorter than the wings. 
