160 MEMOIRS ON THE COLEOPTERA 



fourths longer than wide, widest at three-fifths, the converging sides 

 basally feebly arcuate, with a small deep angular nick just behind 

 the basal angles, which are thereby rendered prominent, the basal 

 carinule very short and feeble; surface dull, with the inner vestigial 

 costule forming a rather wide and feebly convex line, the others 

 obsolete, the creases small and rather close, producing feeble rugos- 

 ity, the punctures rather strong but unequal suturally, the flanks 

 rugose with deep transverse wrinkles; legs very slender. Length 

 (cf) 20. o mm.; width 8.2 mm. Kansas (locality unrecorded). 



gracilior n. sp. 



Body less convex, the elytra more or less strongly oboval, much less con- 

 vex or flattened medially, rarely broadly impressed along the suture. 5 

 5 Prothorax, at least in the male, larger, fully three-fourths as wide as 



the elytra 6 



Prothorax notably small, sometimes but little more than half as wide as 



the elytra in either sex 9 



6 Sides of the prothorax rather widely concave for the present group. . 7 



Sides very narrowly concave 8 



7 Form only moderately elongate, rather shining, black or feebly 

 picescent; head rather strongly and narrowly impressed transversely, 

 finely and sparsely punctate, more coarsely and closely along the mar- 

 gins only; prothorax about a third wider than long, the sides parallel, 

 evenly and rather strongly rounded, the apex moderately deeply, 

 subcircularly sinuate, the angles rather blunt; punctures minute and 

 sparse, the sides rather widely and deeply concave, sparsely and 

 distinctly punctate, the strongly elevated edge thin; elytra strongly 

 oboval and posteriorly inflated, the sides strongly rounding to the 

 base, the apical lobe small but evident; surface feebly impressed 

 suturally, rather smooth, creased, only very finely, feebly and sparsely 

 punctulate even suturally, the vestigial costules nearly obsolete; 

 humeral carinule also obsolete; legs moderate in length, very slender. 

 Length (tf , 9) 18.5-19.0 mm.; width 9.5-10.0 mm. Arizona 

 (locality not recorded). Near the Pima villages on the Gila River, 



LeConte obovatus Lee. 



A Similarly rather stout, opaque, the elytra strongly shining, deep 

 black throughout; head feebly and broadly impressed transversely, 

 with similar rather strong but sparse punctures, the last palpal 

 joint (d 71 ) thinner, more than twice as long as wide; prothorax as 

 in obovatits but relatively larger and with the apical sinus more 

 transverse at the bottom, the surface much more densely opaque 

 than in the preceding species; elytra much more broadly flat 

 above, more elongate and less rounded in the male, very abruptly 

 convex and becoming vertical at the sides, the small but deep 

 sparse punctures very distinct throughout, becoming gradually a 

 little stronger and uneven in size toward the suture; humeral 

 carina short and very feeble, not elevated but defined by the 

 feeble dorsal concavity within; abdomen shining; legs rather 

 longer than in the preceding but slender. Length (cf, 9) 18.5- 

 22. o mm.; width 9.5-10.0 mm. Arizona (San Bernardino Ranch, 

 Cochise Co.) nitidipennis n. subsp. 



