AMERICAN COLEOPTERA. 269 



Anterior tarsi of male with three joints rather broadly dilated. 

 Posterior femora of male toothed. 



Tooth of femora long, hind tibiae arcuate Iliibbardi n. sp. 



Tooth short and near the middle of femur. Tibiae straight. 



Form oblong-oval, not broader in front, hind angles of thorax very 



obtuse or rounded. 



Anterior tibiae of male sinuate within; punctuation of thorax dense 



and conspicuous. Femoral tooth very small. ..dcntatum Lee. 



Anterior tibiae of male arcuate; punctuation of thorax rather sparse 



and inconspicuous. Femoral tooth very evident. ..celatum n.sp. 



Form oval, broader in front, hind angles of thorax distinct almost 



rectangular. 



Anterior tibiae of male sinuate within; punctuation of thorax fine 



and rather sparse. Femoral tooth small patum n. sp. 



Posterior femora of male without trace of tooth. 



Hind angles of thorax distinct, sometimes acutely rectangular. 

 Body evidently broader in front, the elytra rather rapidly narrowing to 

 apex with feebly arcuate sides as in Ptoma-phagus. 

 Surface subopaque, densely punctured, sutural stria entire; larger 



species (.10 — .12 inch) niagiiicolle Mann. 



Surface rather shining, thorax sparsely punctate, sutural stria evanes- 

 cent near base, smaller species .06 inch pusillum n. sp. 



Body oblong-oval, not wider in front, elytra behind the humeri usually 

 wider than the thorax. 

 Thorax densely punctured with fine equal punctures. 

 Middle and hind tarsi compressed and distinctly shorter than the 



tibiae, species larger .10 — .12 inch clavatutu Mann. 



Middle and hind tarsi slender, very nearly as long as the tibiae, 



species smaller .08 inch inerine Mann. 



Thorax with coarse rather deep punctures with finer ones in the 



intervals tlioracicunt n. sp. 



Hind angles of thorax rounded. 

 Punctuation rather coarse and submuricate, form more convex and more 

 obtuse in front; color piceous, legs rufous.. ..asperatum n. sp. 

 Punctuation fine, form depressed, oblong; color brown to rufous. 



nevadense n. sp. 



C. bidentatiim Sahib. — Oblong-oval, a little more obtuse in front, piceous 

 or castaneous, finely pubescent. Head coarsely punctured. Antennae attaining 

 the middle of the thorax, rufous at base, club piceous. Thorax about one-fourth 

 wider at base than long, sides gradually arcuately narrowing to apex, base 

 truncate, hind angles obtuse, surface very densely punctate. Elytra as wide at 

 base as the thorax, sides gradually arcuately narrowing to apex, sutural stria 

 finely impressed, arcuate at middle, attaining both base and apex, surface very 

 faintly substriate, densely punctured, similar to the thorax with the punctures 

 slightly muricate, each bearing a short fine hair. Body beneath densely 

 punctulate but more finely than above. Femora more sparsely punctate. 

 Length .10 — .12 inch; 2.5 — 3 mm. 



Male. — Anterior tibia slender, straight, squarely truncate at tip, outer edge 

 extremely finely spinulose, the spurs short, stout, the anterior slightly lobed 

 at the sides, the tarsus slender, filiform and glabrous. Middle tibiae straight. 



