34O MEMOIRS ON THE COLEOPTERA 



and slightly separated punctures, bearing long squamules and rather 

 short, very sparse inconspicuous erect hairs, the surface squamose 

 near the eyes; clypeus concave, very strongly, rather closely punctate, 

 the apex broadly and subangularly sinuate, the angles well rounded, 

 the sides thence to the base converging, the yellow scales long, atten- 

 uate, rather close-set, smaller, very dense and as usual more erect 

 apically; antennal club missing in the type; prothorax not more than 

 twice as wide as long, subtrapezoidal in outline, very much as in 

 arguta but more broadly and strongly lobed at base; punctures 

 rather coarse and strong, very close-set as a rule but sparse in an 

 area near the median vitta anteriorly; scales yellow, all decumbent, 

 long and finely attenuate, broad basally, narrower elsewhere and 

 very small laterally, without trace of erect hairs at any part, the 

 medial and sublateral vittae broad, very dense and whitish, the latter 

 broadly interrupted anteriorly; sctitellum with a large medial 

 dilated squamose area; elytra broad, not a third longer than wide, 

 fully two-fifths wider than the prothorax, rapidly rounding behind 

 in apical third; surface with large irregular smooth and punctureless 

 rugosity at each side of the intervals, the intermediate regions with 

 small and gradually attenuated, sparse yellowish scales, the dense 

 sutural and less than usually ragged discal lines white, the second 

 discal line broad, subinterrupted near basal third in the type; 

 pygidium slightly wider than long, triangular, extremely densely 

 clothed with yellowish squamules and short hairs almost throughout, 

 the vestiture not closely decumbent and a little less dense along the 

 middle; legs ferruginous. Length 26.5 mm.; width 12.2 mm. New 

 Mexico (Jemez Springs), Woodgate. The unique type is some- 

 what imperfect latifrons n. sp. 



22 Oblique dense line behind the humeral umbo disconnectedly pro- 

 longed posteriorly, the posterior part generally evident, though 

 sometimes obsolete; this section includes the largest American 



species of the genus 23 



Oblique dense line behind the humeri never prolonged posteriorly. . . .25 

 23 Antennal club enormously developed, longer than the head and 

 prothorax and nearly seven times as long as the stem. Body very 

 stout, oblong-oval, shining, castaneous in color; vertex and basal 

 part of the clypeus with abundance of long erect coarse brown hair, 

 the former with broad scales near the eyes; clypeus deeply concave, 

 sparsely punctate and without scales basally, with close-set short 

 stiff hairs or hair-like scales apically; apex broadly and feebly sinuate 

 or faintly bisinuate, the angles generally well marked, sometimes 

 everted and prominent, the sides parallel nearly to the base, then 

 converging; antennae dark brown; last palpal joint slender; prothorax 

 short, much more than twice as wide as long, the sides obtusely 

 and feebly subangulate near the middle; punctures rather coarse, 

 very sparse, each partially filled by a large oval yellow scale, the 

 scales becoming more slender laterally; median line subentire; 

 sublateral vittae and base toward the vittae densely and more albido- 

 squamose; erect hairs distinct toward the middle at apex; scutellum 

 densely, rather narrowly squamose along the middle; elytra large, 



