26o Natural History Bulletin. 



excavation a transverse groove not connected. The third 

 segment bears before the middle, two tubercles mutually dis- 

 tant one-half its width. 



Habitat. Texas. Unknown to us. 



Decarthron, Brendel. 



Disk of the vertex longer than wide, quadrate, or less nar- 

 rowed in front than in Biyaxis, the frontal foveas wanting. 

 Antennas ten-jointed, the joints entirely rounded, excluding an 

 ankylosis of any two. The prothorax is subglobose, the sides 

 rounded, a single rude funnel-shaped fovea being situated 

 near the middle of the base. The elytra are very broad 

 shouldered, the base bifoveate, the sutural lines always 

 straight, parallel, the discal lines divergent from the base and 

 parallel in the posterior half. Abdomen short and wide, the 

 basal dorsal segment not less than one-third as long as wide, 

 the carinas distant, parallel, almost entire. The intermediate 

 thighs of the male are dilated, constricted in the distal half. 



The following table will serve to separate our species: 



a^ Form of body, broad, robust. 

 b^ Pubescence long, erect. 



Occipital fovese large, front depressed, connected with the foveae 

 bv faint convergent sulci. Length, 1.4 mm. Color, black. 

 $ femoral mark small near the end. - - abnorme. 



Occipital fovese small, lateral grooves parallel, dividing the front, 

 which is not depressed, from the superantennal tubercles, the 

 interval punctured. Length, 1.6 mm. Color, dark red. 

 $, femoral mark large spinous near the middle. - exsectutn. 

 b^ Pubescence short. Male femoral marks small. 



Occipital fovese none, lateral groove interrupted, frontal space 

 plane, punctured. Length, 1.7 mm. Color, brown, brendelli. 

 Occipital foveie faint, pubescence very dense, hiding the sculp- 

 ture of the entire upper surface. Length, 2 mm. Color, 

 brown. ........ strenuuin. 



a^ Form, slender elongate, occipital fove?e prcbent. 

 ci Prothorax impunctate. 



Abdominal carina; including more than one-half the segmental 

 width. Color deep yellow, i femoral spine short, near the 

 distal end. - - loiia^ulum. 



