AMERICAN COLEOPTERA. 21 



punctures rather more distinct. The resemblance between these two 

 species has a parallel in another portion of the series, ventricosus and 

 alternatus of which the females are at times very troublesome to 

 separate. 



Numerous specimens were collected by Mr. Crotch along the Santa 

 Ana River, at Sau Bernardino, California. 



HET.SRIUS, Erichs. 



H. tristriatus, n. sp. — Form broadly oval, robust; color castaueous, 

 shining; surface sparsely clothed with recumbent pubescuce intermixed 

 with moderately long yellowish hairs. Head sparsely punctured, front con- 

 cave. Thorax wider thaa long, slightly wider at base than apex ; on each side 

 a deep oblique groove, deeper posteriorly, dividing the surface into a discal 

 and lateral portions; discal division shining, very sparsely punctured; lateral 

 portion divided again in two by a deep transverse groove, the posterior 

 being elongate oval, smooth, shining, the anterior flattened but irregular, 

 dilated in front, and with sparsely punctured surface. Elytra with the sub- 

 humeral (or marginal) stria extending two-thirds the length of the elytra, first 

 dorsal entire arched at tip toward the third, second very slightly shorter, third 

 entire, striae deeply impressed at basal end, their outer margins being elevated. 

 Propygidium sparsely punctured, pygidium smooth with few punctures at the 

 sides only. Prosternum at tip deeply emarginate, stria extending entirely 

 around the tip, anteriorly moderately eonsticted and at extremity truncate 

 and perforate. Mesosternum with distinct marginal line. Metasternum and 

 abdomen smooth, shining. Length .10 inch ; 2.5 mm. 



The appearance of this species is very much that of niorsus, but it 

 is smaller and relatively broader, the thoracic angles are less dilated 

 in front although of similar aspect. The striation of the elytra is en- 

 tirely different and the legs of the present species very much shorter, 

 resembling those of our other species. 



Several specimens of this species were collected by Mr. Crotch, at 

 Calaveras, California. 



PAROIIIAL.IJS, Erichs. 

 P. difiieilis, n. sp. — Oblong oval, sub-depressed, piceous, shining. Tho- 

 rax and elytra moderately coarsely but not densely punctured. Elytra with- 

 out traces of dorsal striae, sutural moderately impressed, extending two-thirds 

 to base. Body beneath much more finely and sparsely punctured than above, 

 mesosternum with entire marginal stria. Length .08 inch; 2 mm. 



This species possesses characters of biatnatus and semimdum. Of 

 the former it has nearly the form and a similar mesosternal line, and 

 with the latter it agrees in the possession of the abbreviated sutural 

 stria. 



Several specimens collected by Mr. Crotch, Mojave, California. 



