250 MEMOIRS ON THE COLEOPTERA 



Body oblong, moderately stout and convex, somewhat shining, castaneous 

 in color; head rather small, narrowed behind the large convex eyes, 

 which are separated by a third (cf ) to four-fifths ( 9 ) their width ; an- 

 tennae (d*) extending to apical third of the elytra, stout, the closely 

 imbricated joints very short, rather rapidly narrower only at apex; 

 prothorax small, much more than twice as wide as long, formed nearly 

 as in debilis, except that the median tooth is at and not before the 

 middle of the sides, the hind angles more externally prominent and 

 acute and the apex more transverse, with a small sinus near each side, 

 finely, sparsely punctate, very coarsely and unevenly at the sides; 

 scutellum bluntly ogival at tip; elytra (c?) three-fifths longer than 

 wide, fully a third wider than the prothorax, the sides distinctly con- 

 verging from base to the obtusely rounded apex and feebly arcuate, 

 the punctures large and well separated but shallow and unevenly 

 impressed, the raised lines feeble and very obtuse; sterna all densely 

 pubescent; tarsi long and very slender, the pads beneath denser than 

 in imbricornis and with a narrower sulcus; in the female the elytra 

 are parallel, with more strongly and subevenly arcuate sides, and 

 the antennae are slender, extending not quite to basal two-fifths of 

 the elytra and they are 23- or 24-jointed, the outer joints small and 

 bilaterally acute. Length (cf) 31.0, (9 ) 26.0 mm.; width (cf ) 12.0, 

 (9 ) n.o mm. Texas and Colorado. The Colorado female possibly 

 does not belong to the Texas male, being much smaller and of dif- 

 ferent shape, but the prothorax is identical in form, differing much 

 in this way from either of the varieties given below. [P. fissicornis 



Hald., Proc. Acad. Phila., Ill, p. 125] fissicornis Hald. 



A Form more slender than in the preceding and much darker in 

 color, black or faintly piceous-black, the abdomen feebly rufescent, 

 the legs and antennae blackish-brown; surface very shining; head 

 notably small, very much narrower behind than across the eyes, 

 which are very convex and separated by three-fourths their 

 width, the antennas ( 9 ) slender, with the basal joint rather stout 

 as usual, not extending behind basal third of the elytra, 22-jointed; 

 prothorax nearly twice as wide as the head, much more than twice 

 as wide as long, not subparallel as in the preceding but gradually 

 angulate to the middle of the sides from just before the prominent 

 acute basal angles and just behind the small and obtuse apical 

 teeth; elytra parallel, with evenly and distinctly arcuate sides, 

 much shorter than the abdomen, less than three-fifths longer than 

 wide, at the middle two-fifths wider than the prothorax, the punc- 

 tures rather large but feebly impressed, everywhere widely sep- 

 arated, the two inner raised lines distinct; sterna subglabrous 

 as in the preceding female; tarsi more slender, almost filiform, the 

 pads beneath very slender and rather thin. Length (9) 27.0 



mm.; width 10.4 mm. Texas parviceps n. subsp, 



B Form stouter, much larger, similarly parallel, more oblong, the 

 head and prothorax very much more developed, similar to parvi- 

 ceps in coloration, in the shining lustre and sparse though large 

 elytral punctures, the surface becoming more rugose apically; 

 head moderate, nearly three-fifths as wide as the prothorax, the 



