Coleopterological Notices. T5 



head, with very small eyes, and long strongly arcuate tempora, its 

 parallel fonu and relatively smaller, very coarsely punctate elytra, 

 at once distinguishing it from any other. 



A. princeps n. sp. — Rather convex, parallel, pale flavate tlirongliont ; 

 head slightly darker, fuscescent ; antennae feebly infuscate toward apex ; in- 

 teguments polished ; pubescence sparse but rather long and distinct. Head 

 fully as wide as the prothorax, rather strongly and densely punctate except 

 in the middle and anteriorly ; punctures moderate ; median post-vertical 

 impression feeble ; nuchal constriction very strong ; eyes moderate, slightly 

 jjrominent, the tempora nearly twice as long, strongly arcuate and a little more 

 prominent ; antenn;e rather slender, feebly incrassate, distinctly longer than 

 the head and prothorax ; basal joint subequal in length to the next three, 

 second very slightly longer than the third, sixth fully as long as wide, tenth 

 ratlier longer than wide and wider than long on the uncompressed and com- 

 pressed sides respectively. Prothorax three-fifths wider than long ; sides 

 broadly, obtusely subangulate at anterior third, thence distinctly convergent 

 and nearly straight to the broadly rounded basal angles ; base broadly sub- 

 transverse : apex very broadly, feebly arcuate ; apical angles slightly obtuse 

 and scarcely perceptibly rounded, not at all prominent ; disk strongly, arcu- 

 ately impressed on each side of the median impunctate area, the impressions 

 abruptly reflexed and continuing anteriorly nearer the sides, inclosing an 

 impunctate callus ; elsewhere rather strongly and densely punctate. Elijtra 

 about two-fifths wider and two-thirds longer than the prothorax, not qviite as 

 long as wide, strongly impressed along the suture toward base ; disk rather 

 depressed, rather coarsely, deeply and densely punctate, the punctures gener- 

 ally separated by a little less than their own diameters. Abdomen just visibly 

 increasing in width from base to apex, slightly narrower than the elytra ; sides 

 straight ; surface very finely, sparsely punctate, just perceptibly clouded with 

 fuscous toward apex, the latter again paler. 



Male. — Sixth segment very broadly arciiately emarginate throughout its 

 wiiltli, the edge in middle third fimbriate with a line of excessively short and 

 minute pointed membranous hairs, the surface with two diverging tufts of long 

 setfe, the intermediate broadly triangular apical portion scarcely impressed but 

 devoid of pubescence. Seventh segment broadly, angularly emarginate, the 

 surface having in middle two-fifths a transverse strongly and posteriorly angn- 

 late line of densely placed obliquely inclined spinose setse, the anterior inclosed 

 surface feebly imjjressed and devoid of pubescence ; surface laterally, beyond 

 the line of set*, having numerous very long stiff bristles. Eighth segment 

 nearly normal, not impressed. 



Female . — U nk now n . 



Length 4.4 mm. 



Nevada. 



In its wonderfully distinct sexual characters, large size, pale 

 coloration and longer pubescence, especially of the pronotum, this 



