140 
Psyche 
[December 
cally. Undersurface sparsely clothed with short golden pile ; 
anterior tibiae tridentate, basal tooth slightly ante-median, 
tarsal claws with inner, truncate tooth ante-median, hind 
tarsi shorter than hind tibiae. Length 10 mm., width 5.5 mm. 
Holotype in the writer's collection, taken at Rancho La 
Golondrina, Rio Sabinas, Muzquiz, Coahuila, Mexico, June 
28, 1938 by Rollin H. Baker after whom the writer takes 
pleasure in naming this species. Forty-three paratopotypes 
deposited in the collections of 0. L. Cartwright, R. H. Baker 
and the author. 
This species appears to be most closely allied to the Texan 
Diplotaxis belfragei Fall but can be readily distinguished 
from it by having the mentum declivous from anterior two- 
fifths rather than the middle, by its smaller size, generally 
more strongly angulate side pronotal margins, by the smaller 
less dense pronotal punctures and by its longer truncate un- 
gual tooth. The mentum is somewhat variable in the type 
series and might conceivably allow specimens to be keyed 
out to the bracket including D. nicer ens Lee. and D. puncti- 
pennis Lee. in Fall's key. Diplotaxis bakeri can be separated 
from D . mcerens by its shallowly emarginate labrum, more 
sparsely and finely punctate pronotum and by its more 
strongly declivous mentum. From D. punctipennis it can be 
separated by its distinctly sinuate side clypeal margins, by 
the smaller and more sparsely placed pronotal punctures and 
by having the inner truncate tooth on the anterior tarsal 
claws distinctly shorter than the claw proper. Diplotaxis 
bakeri superficially resembles D. maura Fall but can be dis- 
tinguished from that species by having the pronotal punc- 
tures smaller and more sparsely placed, by having the basal 
tooth of the front tibiae more nearly median in position and 
by having the tarsal claws more deeply cleft. 
Diplotaxis volatica Cazier, new species 
Small, reddish-brown; upper surface glabrous; labrum 
broadly, arcuately emarginate; mentum feebly oblique be- 
hind, strongly declivous for anterior two-fifths; declivity 
concave from side to side, posterior margin of declivity ar- 
cuate, without raised line or setae; pronotal angles not im- 
pressed ; hind femora sparsely punctate between submarginal 
