COLEOPTERA. 181 



seventh much longer and slightly less robust than the eighth, ninth nearly 

 as large as the tenth ; maxillary palpi long and slender, pale fiavo-testaceous 

 throughout, third joint as long as the first two together. Prothorax widest 

 in the middle, where it is much narrower than long, and scarcely more than 

 three-fourths as wide as the head ; sides thence slightly more convergent 

 posteriorly than anteriorly, nearly straight in both ; prominently angulate 

 at the widest section ; anterior margin slightly longer than the posterior, 

 equally and extremely feebly arcuate ; surface just visibly and minutely, 

 swollen near each basal angle, elsewhere very evenly convex ; punctures 

 very deep, round, nearly evenly distributed, rather small, distant by less 

 than one-half their widths. Elytra at base about equal in width to the 

 head ; sides nearly parallel, distinctly arcuate, very slightly longer than the 

 width at base ; together broadly, roundly, and rather strongly etnargiuate 

 behind ; suture one-fourth longer than the pronotum ; surface somewhat de- 

 pressed, very feebly impressed along the suture, very even ; punctures rather 

 coarse, very close, evenly distributed, deep, distant by about one-half their 

 widths ; interspaces nearly flat, highly polished, very intense black. Abdo- 

 minal segments decreasing uniformly and very gradually in width, first as 

 wide as the contiguous elytra, sub-cylindrical after the first ; border nearly 

 obsolete, except on the first where it is prominent ; surface very deeply, 

 closely, and evenly punctate ; punctures as large as those of the pronotum ; 

 transverse carinae slightly cusped in the middle. Legs moderate in length, 

 slender, black, tarsi pale fulvo-testaceous ; first joint of the posterior as long 

 as the last two together, also as long as the second and third together, second 

 nearly twice as long as the third ; fourth joints small, lobes small ; third 

 joints very deeply emarginate at tip. 



Male. — Unknown. 



Female. — Sixth ventral segment broad and very obtuse behind, produced 

 in the middle in the form of a broad cusp, point very feebly rounded, sides 

 near the cusp feebly sinuate. 



Length 4.4 mm. 



Arizona, 3. 



The punctuation, very deep, close, and regular, reminds us of that of 

 pinguis, from the Pacific Coast. The integuments in this species are 

 of an intense black, differing from the usual grayish-black of the more 

 closely-allied species. The large head, sub-quadrate depressed elytra, 

 very pale palpi and tarsi, and deep dense punctuation, will aid in 

 identifying it. 



The conformation of the tarsal claw is shown on the plate ; it is 

 much more slender and less abnormal than in other species in this 

 vicinity. 



26. A. o?>soletllS n. sp. — Form rather slender, sub-cylindrical. Pubes- 

 cence short, rather coarse, moderately sparse, evenly distributed, cinereous. 

 Head rather small, scarcely twice as wide as long ; interocular surface nearly 

 flat, three-fourths wider than the eye; equally divided by the sulcations, 



