20 GEO. H. HORN, M. D. 



peus broad at base, equal to half the apex, and nearly as wide as the distance to 

 the eyes ; thorax a little longer than wide, sides posteriorly nearly straight, arcu- 

 ate at apical third, disc moderately convex, at base a moderately broad triangular 

 depression, at the bottom of which the median line is distinctly impressed and 

 extends forward to the middle becoming gradually obsolete, surface moderately 

 densely punctate, distinctly rugose at the sides ; elytra faintly striate at the base 

 and sides, the surface more finely and sparsely punctate than the thorax ; body 

 beneath moderately densely punctate, more sparsely and coarsely in front ; pro- 

 pleural triangle twice as long on the outer side as wide at base, the antennal 

 groove shallow, deeper in front, not sharply limited internally ; mesopleurte 

 sparsely j)unctate in front and externally ; legs piceous, tarsi brown. Length .38 

 inch ; 9.5 mm. 



This species and the next are remarkable in having the antennal 

 grooves badly limited on their inner side. The present species is 

 more shining and with almost invisible pubescence. In general ap- 

 pearance it resembles cyluidricol/is, but is larger and less convex. 



Occurs in Oregon and Washington Territory. 



D. basalis Lcc. — Form moderately elongate, slightly attenuate posteriorly, 

 black, subopaque, clothed with very short brown pubescence, but with the basal 

 third of the elytra more densely clothed with longer, yellowish cinereous pubes- 

 cence ; antennse dark brown, slender, filiform, slightly longer thau to the hind 

 angles of the thorax, second joint as long as the fourth, third a little longer than 

 the next two, four to ten gradually longer, eleventh nearly as long as the two pre- 

 ceding ; head convex, densely and rather roughly punctured ; clyi^eus as broad at 

 base as half the apex and nearly as wide as the distance to the eyes ; thorax as 

 broad as long, sides posteriorly straight, arcuately nari'owing at apical third, disc 

 moderately convex, a vague depression at the middle of the base, median line 

 feebly impressed extending forward nearly to the middle, surface very densely 

 punctured and at the sides rugose; elytra substriate, the surface moderately 

 densely punctured, more finely than on the thorax ; body beneath more sparsely 

 and more finely punctured than above, the punctures of the prosternum coarser ; 

 triangle of the propleurse not twice as long as wide at base, the antennal groove 

 shallow and scarcely at all limited internally ; mesopleurse sparsely punctate ; legs 

 brown, the femora darker. Length .24 - .34 inch ; 6 - 8.5 mm. 



The antennal grooves are even more shallow than in nitens, a char- 

 acter which seems to have been entirely overlooked by Bonvouloir. 

 The paler pubescence forms a broad band at the base of the elytra 

 and becomes gradually wider externally. 



The very shallow and feebly limited antennal grooves of these two 

 species seem to indicate some relationship with those species of Ne- 

 matodes in which there is a beginning of an antennal groove near the 

 front angle of the thorax. 



This species occurs in the mountainous regions of Northern Cali- 

 fornia and Nevada. 



