NOKTII AMERICAN COLEOPTERA. 45 



rough, punctures Vcariolate ; labrum very feebly emargiiiate anteriorly, sides 

 broadly rounded, "fringe of setae very strong, setae fulvous ; supra-orlntal 

 ridges acute and distinct ; antennae moderate in length, rather slender, third 

 joint slightly longer than the fourth. Prothorax distinctly wider at base 

 than at the vertex, where it is much wider than the head ; base generally 

 arcuate, distinctly and strongly trisiniiate, apex very broadly aud feebly 

 emarginate ; sides most strongly arcuate in front of tlie middle, slightly con- 

 vergent posteriorly, feebly sinuate anteriorly ; anterior angles very slightly 

 rounded, posterior slightly obtuse, but not at all rounded ; prouotum mar- 

 gined anteriorly and posteriorly, narrowly reflexed at the sides, edges acute ; 

 disk moderately convex, rather finely and closely punctured in the middle, 

 punctures becoming larger and closer toward the sides. Elytra at base 

 slightly wider than the contiguous pronotum ; sides just perceptibly diver- 

 gent posteriorly and nearly straight for three-fourths the length from the 

 humeri, disk nearly three and one-half times as long as the pronotum, 

 rather strongly convex, narrowly reflexed at the sides, somewhat acutely 

 rounded behind ; rather strongly, closely, and minutely punctate in the 

 middle, punctures much larger at the sides, in the middle they are slightly 

 more distant in the rows than the distance between the latter ; the 

 surface is, in addition, very feebly undulated, minutely and irregularly 

 creased, minutely granulated, and, toward the sides, having numerous 

 elevated points. Under surface of abdomen strongly convex, very finely 

 punctate, very closely so on the last segment ; prosternum strongly and 

 closely pitted. Legs rather long ; posterior tarsi as long as the tibiae, first 

 joint as long as the fourth, longer than the second and third together, second 

 longer than the third. Length 9.2 mm. ; width 3.5 mm. ; size very uniform. 



Arizona (Morrison). 



The mentum is strongly and roundly emarginate at apex, through 

 a distance equal to nearly one-third its width at base ; the exposed 

 surface is strongly punctate posteriorly, and obliquely rugulose ante- 

 riorly. The spurs of the anterior tibiae are as in emarginatum. 



EMMEXASTUS. 



E. Iiauillus n. sp. — Form robust, very convex. Entire body covered 

 very sparsely with extremely short, semi-erect setae, which are almost invisi- 

 ble. Upper surface very dark piceous-brown, nearly black, legs and under 

 surface much paler, piceo-rufous, the former slightly the paler, antennae 

 still paler, piceo-rufous. Head much broader than long ; anterior margin 

 transverse and straight, angles broadly rounded ; interocular surface rather 

 convex, deeply, very closely, rather coarsely and roughly, though eveuly 

 punctate ; eyes small, very feebly convex ; antennae as long as the width of 

 prothorax, second joint two-thirds as long as the third and as long as the 

 fourth, joints five to eight shorter, successively and feebly decreasing in 

 length, last three joints strongly flattened, ninth and tenth broader than 

 long, sub-triangular, eleventh slightly longer than wide, oval. Prothorax 

 four-fifths wider than long ; anterior and posterior margins straight and 

 transverse, the former about one-fifth shorter, slightly longer than the width 



