228 AMERICAN COLEOPTERA. 



AtliOii»« niigsilis u. sp. — Brown or piceous-brown, extreme margins of 

 clypeus, prothorax— especially the hind angles — and elytra including the suture, 

 more or less evidently hut indefinitely paler; antennse, legs and margins of ven- 

 tral segments more obviously paler; pubescence short, brownish-gray, rather 

 inconspicuous; form moderately slender. Antennse (male) about two and one- 

 half joints longer than the prothorax, second joint one-third as long as the third, 

 the latter slightly but visibly longer than the fourth; third and fourth joints 

 widest, the latter three-fourths as wide as long. Head strongly closely punc- 

 tured, front moderately deeply impressed. Prothorax about one-fifth longer 

 than wide, base but little wider than the apex, sides very broadly arcuate, a little 

 sinuate before the hind angles, which are short and scarcely or but sligthly di- 

 vergent; surface polished and closely punctate, the punctures rather coarse, dis- 

 tinctly umbilicate and nearly in mutual contact at sides; a little finer at middle, 

 where they are separated as a rule by from one-quarter to three-quarters their 

 own diameters; hind angles carinate. Elytra finely striate, interspaces nearly 

 flat and finely punctate. Punctuation and pubescence beneath as usual ; first 

 joint of hind tarsus nearly equal to the next three ; tarsal lobes very small and 

 indefinite. Length 10-12 mm. ; width 2.8-3.3 mm. 



Southern California— San Bernardino Mts. and e].«ewhere in the 

 Southern Sierras and adjacent foothills. 



The above description is drawn from the male, the female differ- 

 ing in the usual way, viz. : the somewhat broader form, more con- 

 vex prothorax, with sides more strongly rounded, and the shorter 

 antennse. 



Structurally nugalis is very close to what I have interpreted as 

 nigripilis Mots. The latter is entirely black or very nearly so, the 

 form slightly stouter, the frontal impression more sharply defined 

 and more obviously triangular in outline, the prothorax with a very 

 narrow, incomplete, smooth, median line, which is never at all indi- 

 cated in nugalis. Nigripilis is a common species in the coast 

 region from the vicinity of San Francisco to Oregon, and probably 

 farther north. Specimens in my collection from Kaweah and Yose- 

 mite are doubtfully referred to nugalis. These in their darker color 

 and form approach nigripilis. Others from Sylvania are equally 

 puzzling, but are for the present placed with nigripilis. It is prob- 

 able that one or two distinct but closely allied species are here 

 involved, but their definition is not possible witli the material at 

 hand. 



AtliOUK recHcollis n. sp. — Similar to the preceding, except in following 

 particulars: antennse more slender, the fourth joint but slightly more than half 

 as wide as long, frontal impression deeper and more sharply defined, distinctly 

 triangular in outline; prothorax narrower, the sides not in the least arcuate at 

 middle, straight or just visibly sinuate from the hind angles almost to the ante- 

 rior margin ; punctuation coarser and a little less close than in nugidis. 



