Coleopterological Notices, V. 537 



repre?ented by two oblique grooves at the sides not extending 

 beyond the eyes, and there are four distinct tibial denticles, of 

 which the basal is however small. 



PSILOSCELIS Mars. 



The following species belongs- near 7-ej)leta Lee, but is smaller 

 and more depressed. 



P. corrosa n. sp. — Oblong, depressed, piceous-black, moderately shining, 

 densely punctate, the punctures large variolate and intermingled with others 

 which are minute but deep, sparse toward the elytral suture but dense else- 

 where, subcontinent on the elytra and almost obliterating the striae, rather 

 fine beneath. Head transverse, densely, rugosely punctate, without a distinct 

 marginal stria, the antero-lateral angles acute ; mandibles stout, porrect. 

 Prothorax four-fifths wider than long, the sides very feebly convergent from 

 base to apex and feebly arcuate ; marginal stria deep and distinct, not attain- 

 ing the apex ; lateral stria coarse, only visible in basal third where it is very 

 close to the marginal, represented thence anteriorly only by feebly defined 

 and detached fragments ; disk densely and very deeply punctate even toward 

 the middle. Scutellum very small, smooth and polished. Elytra not quite as 

 long as wide, one-half longer than the prothorax and scarcely at all wider ; 

 sides subparallel, feebly arcuate; striae coarse but shallow and not well de- 

 fined ; outer subhumeral represented by a short longitudinal and outwardly 

 arcuate stria in basal third, not attaining the base ; inner subhumeral entire; 

 first and second dorsals entire, the third obliterated toward base ; fourth only 

 visible near the apex. PropiiyicUum large, coarsely but not very densely punc- 

 tate, the punctures rounded and umbilicate ; pygidium rather small, strongly 

 and closely punctate. Prosternum not striate, the lobe long, deflexed, strongly 

 rounded, margined ; disk behind the lobe with two distant punctures. Meso- 

 sternum with a small feeble median emargination ; marginal stria subentire. 

 Legs stout ; anterior tibiae broadly triangular, with four broad external teeth 

 a)ranged in two pairs ; posterior tibiae parallel, very strongly compressed, the 

 external edge thin and with a single series of four or five distant spinules. 

 Length 4.3 mm. ; width 2.4 mm. 



Wyoming (Cheyenne). 



The antennal cavities are deep and at some distance behind the 

 apical angles, fully exposed, and not at all concealed by the anterior 

 margin of the prosternum. 



This interesting species is probably myrmecophilous, but no note 

 to this effect accompanies the unique specimen, for which I am 

 indebted to its discoverer, Mr. Hugo Soltau. 

 AkxXals N. Y. Acad. Sci., VII, Dec. 1893.— 35 



