AMERICAN COLEOPTERA. 227 



beinf^ tabulated in a positive manner. The following may serve 

 for the two sexes, the males being easily known by their peculiar 

 characters. 



Elytral sculpture almost entirely obliterated, traces of the rows of punctures 

 remaining only at base. Thorax moderately long, distinctly broader in 

 front, not coarsely punctate. Oblita. 



Elytra with the usual distinct rows of punctures. 



Thorax nearly cylindrical, coarsely and densely punctured. Striae of elytra 

 with deep punctures, extending to three-fourths punctata.. 



Thorax more robust, considerably broader in front, rather sparsely punc- 

 tured. Strise of elytra with feeble punctures < x -ending barely to middle. 



fuscnla. 



C oblita, n. sp. — Pale brownish, moderately shining, sparsely pubescent, 

 form elongate. Head darker, moderately densely punctured, eyes feebly promi- 

 nent. Antennae ferruginous, nearly half the length of body. Thorax nearly 

 a third longer than wide, base slightly narrowed, slightly constricted in front 

 of middle, and rather strongly compressed posteriorly, ante-scutellar impression 

 well marked, surface very sparsely punctulate. Scutellum broader than long, 

 slightly emarginate at tip. Elytra twice as wide as base of thorax, humeri 

 distinct, sides parallel, tip conjointly rounded, disc sparsely and irregularly 

 punctate, the strise evident for a very short extent at base, a median indistinct 

 transverse fascia. Body beneath very sparsely punctate. Length .44 inch; 

 11 mm. 



Male. — Fifth ventral very deeply emarginate, sixth longer than wide, sides 

 straight and gradually narrowing to apex, angles slightly prolonged, acute, 

 between which the tip is rounded. Penultimate dorsal emarginate, last dorsal 

 elongate oval, narrower than the ventral, tip feebly emarginate. The angles 

 of the last ventral segment are carinate, the lower face especially at base 

 obtusely elevated at middle. (PI. I, fig. 12). 



Female. — Unknown. 



One specimen from Camp Grant, Arizona. 



The elytral sculpture may possibly be a peculiarity of the unique 

 before me, but in any case the male characters suffice to distinguish 

 the species from any other. 



C. punctata, Lee. — Pale brownish testaceous, form slender, sparsely 

 pubescent, legs with rather long hairs. Head rather coarsely and densely 

 punctate, eyes moderately prominent. Antennae ferruginous, longer than one- 

 third the body. Thorax nearly twice as long as wide, cylindrical, slightly con- 

 stricted in front of middle and feebly compressed behind it, no ante-scutellar 

 impression, disc coarsely and densely punctate. Scutellum oval, narrower at 

 base. Elytra less than twice the width of thorax at base, humeri distinct, 

 sides slightly divergent posteriorly, apices conjointly rounded, disc with striae 

 of moderately . coarse punctures extending three-fourths to apex, becoming 

 gradually finer and confused at tip, and with a pale fascia behind the middle, 

 extending along the margin toward the apex. Body beneath paler than above, 

 sides of metasternum with coarse but sparse punctures, abdomen still paler, 

 sparsely punctulate. Length .30 inch; 7.5 mm. 



