1943] 
New Species of Cebrio 
35 
than usual and the process of the last segment is acute. Prono- 
tum a little more densely but more shallowly punctured than 
the head. Posterior angles divergent. Striae of the elytra some- 
what indistinct on the basal half, with the punctures obsolete. 
Intervals with confused punctures. The striae and punctures 
are more distinct on the apical half. Prosternal process rather 
slender, tapering evenly from base to apex, quite abruptly ele- 
vated. Apex of last abdominal segment slightly convex. 
C. convexifrons Knull has the third segment of the antennae 
serrate but the general coloration and the form of the head 
serve to distinguish it from that species at a glance. Length, 
13 mm. 3 mm - wide across the base of the elytra. 
Holotype: male, Tuba City, Arizona, July 19, 1935. Gift of 
C. T. Brues (M.C.Z., No. 26074). 
Cebrio atokanus sp. n. 
Male. Moderately slender, only moderately tapering behind. 
Castaneous. Antennae and underside a little paler. Easily dis- 
tinguished by the small third segment of the antennae, which is 
scarcely half as long as the fourth, and by the broad fourth 
segment. 
Head rather densely but finely punctured. A slight V-shaped 
ridge runs from the bases of the antennae back to the middle of 
the head, marking off the anterior portion, which is slightly 
lower than the rest of the head. Sides of labrum oblique and the 
apex moderately shallowly excavated. Last segment of the 
maxillary palpi as long as the third, and more slender than the 
third. Apex rounded. Third segment of the antennae only 
slightly longer than the second and barely half as long as the 
fourth. The fourth is very broad. The following segments are 
about as broad as the fourth across the process but become pro- 
gressively narrower across the base. Process of the last seg- 
ment distinct, obtuse. Pronotum less densely punctured than 
the head. Posterior angles small, divergent. Elytra with inter- 
vals distinctly punctured, the punctures being separate from 
each other. Striae rather feeble, the punctures dying out, toward 
the base. Process of the prosternum linear, slender. Apex of 
last abdominal sternite convex. Length, 12 mm. Width, across 
the base of the elytra, 3 Him. 
Holotype: male, Atoka, Oklahoma (Indian Territory) June 
13, 1915. H. F. Wickham, Hayward Coll. (M.C.Z., No. 26075). 
