236 
Length of wings, 16-17.5 mm. ; of legs in the largest specimen : 
fore femora, 9.75 mm.; tibiz, ro mm. ; tarsi, at least 11 mm. ; 
mid femora, 10.5 mm.; hind femora, 11.5 mm.; tibiz, 11.75 
mm. ; tarsi, 13 mm. 
Florissant, Colorado. Two 2 specimens; Nos. 6062, 13075 ; 
besides which there is a specimen belonging to the U. S. Geological 
Survey, also a $ (No. 1482), from which the measurements of the 
legs were taken. , 
Tipula subterjacens. 
Pl. 8, figs, 3, 5. 
Wings about four times as long as broad, generally rather less 
than more than that, uncolored except for the rather faint and 
rather small stigma. Auxiliary vein terminating well before the 
middle of the inner marginal cell; poststigmatal cross vein varia- 
ble, sometimes short and transverse, at others distinctly oblique 
and moderately long ; trapezoidal cell rather short. Przefurca dis- 
 tinctly shorter than the width of the first and second basal cells at 
its base. Petiole of second posterior cell about half as long as the 
discal cell ; fifth posterior cell much broader at base than at margin. 
Discal cell moderate, about twice as long as broad. Sixth longi- 
tudinal vein moderately distant from the fifth. Legs slender, the 
tibize distinctly slenderer than the femora and scarcely longer than 
they, while the femora are rather less than two thirds as long as the 
wings, and the tarsi are half as long again as the tibia. Abdomen 
pale, with more or less distinct, sometimes almost wholly obliterated, 
dark narrow median and lateral stripes. 
Length of wings, 17.5-20 mm.; of legs in one 2 (No. 9157) as 
follows: fore femora, 9? mm.; mid femora, 1o mm.; tibiz, 9.75 
mm. ; tarsi, 14.5 mm.; hind femora, 11 mm.; tibiz, 8.5 mm. ; 
tarsi, 14.5 mm. 
Florissant, Colorado. Described from seven specimens, one 
3, five 2, one uncertain; Nos. 1866, 4437, 4632, 7222, 8539 
and 9157, 13737, 14972. Besides these No. 2083 and probably 
2063 of the U. S. Geological Survey collection belong here. 
Tipula lethza. 
PIP Os ieee. 
Wings four times as long as broad, uncolored except for the small, 
generally distinct, triangular stigma. Auxiliary vein reaching the 
