236 AMERICAN COLEOPTERA. 



zoidal in form. Platyderus is rather close, but in this the hind 

 angles of the prothorax are somewhat better defined, and the pro- 

 notal vitta is always narrow and incomplete, and frequently nearly 

 or quite absent. 



I'oleiiiius biiiotatus n. sp. — Head black behind the anteiiiiie, pale in 

 front from side to side, mouth and space between tlie gular sutures also pale; 

 prothorax rufotestaceous, with two discal black spots; elytra and metasternum 

 black; abdomen, legs and base of antennae rufotestaceous, tarsi dusky; pubes- 

 cence grayish, short, but sufficiently plentiful to give the elytra a pruinose 

 appearance. Head finely not closely punctulate, prothorax very minutely 

 sparsely punctulate, elytra feebly subscabrous, somewhat shining, elevated lines 

 obsolete. Prothorax with sides only slightly convergent in front, hind angles a 

 little obtuse and not very sharply defined, front angles wanting. Length 7 mm. 



Chiricahua Mts., Arizona (Hubbard and Schwarz). 



The type above described is a male, having the sides of the pro- 

 thorax rather deeply acutely nicked at the middle. The single 

 female at hand differs from the male only in being slightly stouter 

 and in having the abdomen dusky at base; the sides of the pro- 

 thorax not incised. Differs distinctly in coloration from all previ- 

 ously described species. 



MALACHIIDJE. 



Ti'ieliochroiiM sopliiaet n. sp. — Moderately elongate, black, scarcely at 

 all ajneous, legs bright lufous throughout; antennfe rufous, the outer joints infus- 

 cate. Pubescence somewhat sparse, cinereous, subvecumbent, intermixed witli 

 numerous longer suberect blackish hairs; marginal fringe of prothorax irregular, 

 consisting of shorter cinereous and very much longer blackish hairs; marginal 

 fringe of the elytra rather long and entirely pale. Head fully three-fourths as 

 wide as the prothorax, sparsely finely punctate, polished ; labrum ratlier strongly 

 transverse, piceous, apical margin narrowly pale; antennae slender, gradually 

 feebly incrassate, fifth joint obviously longer than wide and scarcely at all wider 

 than the sixth ; seventh not dilated, slightly longer than wide; tenth as wide as 

 long; eleventh nearly twice as long as wide. Prothorax one-third wider than 

 long, widest at basal third, sides moderately arcuate and conveigeut in front, 

 basal angles more narrowly rounded and obtuse. Surface nearly evenly rather 

 strongly punctate, the punctures separated by their own diameters or a little 

 more, inteispaces polished throughout. Elytra distinctly wider than the pro- 

 thorax. parallel, two-thirds longer than wide, punctuation at base similar to that 

 of the prothorax, becoming a little finer and less close toward the apex. Lower 

 surface with rather plentiful cinereous pubescence, abdomen minutely punctate, 

 metasternum scarcely visibly so; prosternal length before the coxae equal to the 

 thickness of the coxa from front to back. Front and middle tibiae each with four 

 marginal spines above tlie apical ones. Length 3.25 mm. 



New Mexico ; Las Cruces (Cockerell), on Sophia. 



