10 
center on apical half. Venation resembling that of Tiphia imornata, the 
vein closing marginal cell gradually curving away from costa consider- 
ably before apex of cell, so that the apex of cell is far removed from 
costa; vein closing apical submarginal sloping backward, so that while 
the anterior portion of apex of the cell is at apex of marginal the pos- 
terior portion of apex is very much distad of it. Legs, especially the 
tarsi, with long soft white hairs, fore and mid tarsi with their joints 
short and broad; hind tarsi, except the apical joint, slender. 
Length, 10-12 mm. 
Type, Texas. No other data. 
A female, with same data, which is in the collection may belong to 
this species. I append a summary of its characters :— 
Differs in color from the male acuta in having the antennae rufous 
below and the wings more evenly yellow. 
Structurally, differs in having the clypeus with a broad impunctate 
lower margin and its outline rounded; the oral opening extends even 
farther back, leaving but a narrow line between it and back of head; 
the first dorsal abdominal segment is shorter and broader, with the trans- 
verse median incision straight; the pygidium is covered on the entire 
surface with large, deep, contiguous punctures; the sixth ventral segment 
with the lateral margins conspicuously sinuate ; the tarsi are less conspicu- 
ously hairy and are not so thick, and the basal joint of hind pair has a 
deep groove on posterior surface; and the venation differs in that the 
vein does not close the marginal cell. 
TIPHIA LUTEIPENNIS Cresson 
Mr. E. T. Cresson kindly furnished me with notes and sketches of 
the type specimen of this species, which enabled me to determine that 
luteipennis is distinguishable from the foregoing species by the follow- 
ing characters: oral opening broader; clypeus apparently smooth; 
pygidium punctate to apex, but the corresponding ventral segment much 
broader, with a broader impunctate margin and an almost regularly 
rounded apex (in acuta it is roundly emarginate) ; tarsi without long 
hairs at base, whereas in acuta there are long hairs which are most con- 
spicuous on the mid pair. 
Described from Colorado. 
TIPHIA CANALICULATA, Sp. 0. 
Male. —Differs from acuta in having the antennae longer, the joints 
normal; the face more evenly punctured; clypeus broad at apex, regu- 
larly and broadly rounded, with a distinct impunctate margin; post-man- 
dibular triangle distinct though small; the back of head, pronotum, and 
mesopleura with a few small punctures interspersed between the large 
ones; lateral margin of sixth ventral abdominal segment with two 
rounded incisions on each side, the central projecting part sharp; the 
