1940] New North American Diplotaxis 139 
angulate side pronotal margins, by its more proximally 
placed basal tooth of front tibiae, by the long pile on the tibiae 
and by the longer tarsal claws. From D. beyeri it can be 
distinguished by its subtruncate anterior clypeal margin and 
convex rather than sinuate side clypeal margins, by its less 
densely punctate pronotum and by the long tibial pile. From 
D. illustris Fall it can be separated by its reddish-yellow 
color, by its more strongly reflexed clypeal margins, by its 
angulate canthi, more strongly rounded lateral pronotal mar- 
gins, by its much wider anterior tibiae, by the post-median 
position of the basal tooth of the anterior tibiae, and by the 
less dense tibial pile. 
Diplotaxis bakeri Cazier, new species 
Medium sized, black; upper surface glabrous; labrum 
broadly, arcuately emarginate; mentum feebly oblique be- 
hind, strongly declivous in anterior two-fifths, declivity con- 
cave from side to side, posterior margin convex but without 
raised line or setae ; thoracic angles not impressed ; hind fe- 
mora impunctate between submarginal rows of setigerous 
punctures ; tarsal claws post median in position. 
Head with punctures separated by about their own widths 
above, more densely placed anteriorly, front only slightly 
raised along clypeal suture ; clypeus densely punctate, punc- 
tures separated by about one-fourth their own widths, suture 
entire, margins shallowly reflexed, anterior margin shal- 
lowly sinuate medially, angles evenly rounded, side margins 
shallowly sinuate, canthi not angulate; antennse ten-seg- 
mented. Pronotum. convex, side margins subangulate medi- 
ally, sides strongly constricted anteriorly, narrowly con- 
stricted basally, anterior angles sparsely produced ; anterior 
margin narrower than basal margin ; surface shining, 
sparsely minutely punctate, punctures separated by two to 
three times their own widths, more closely placed laterally, 
medially with faint indication of longitudinal impression. 
Elytra with shallow costae evident, intercostal spaces irregu- 
larly punctate, punctures separated by about one to two times 
their own widths, surface minutely alutaceous, costae with 
single median row of small punctures; humeral umbone 
prominent ; sides widest at apical third, evenly rounded api- 
