THYCE AND POLYPHYLLA 337 



Antennal club large, three to six or seven times as long as the stem; dense 

 elytral lines of white scales even, never ragged, sometimes though 

 very rarely broken and then with a clean and not irregular break; 

 females abundant, sometimes much more numerous than the males . 22 



1 8 Middle tarsi short, the fifth joint longer than the three preceding 

 combined; elytra very strongly and deeply rugose. Body small in 

 size, of short subcylindric, posteriorly very obtuse form, shining, 

 black, the sides of the pronotum, pygidium, legs and antennae more 

 or less distinctly rufescent; vestiture sparse; vertex and basal parts 

 of the clypeus with strong and well separated punctures, the vertex 

 with sparse and not very long, suberect hairs, also some scales along 

 the sides; clypeus feebly sinuate medially at apex, with rounded 

 angles, the sides thence converging to basal fourth, then diverging 

 to the base, the broadly reflexed apex and the sides with dense 

 yellowish scales, the median parts basally sparsely squamose; 

 antennal club shorter than in any other species, distinctly less than 

 twice as long as the stem, but little more than four times as long as 

 thick, rather feebly bent apically; last palpal joint small, convex, 

 the rough patch on the outer side very small, feeble and indefinite; 

 prothorax twice as wide as long, the sides parallel in basal, converging 

 in apical, half; punctures coarse, well separated, remote at some 

 points, much smaller and closer toward the sides, the vestiture sparse, 

 varying from elongate attenuate scales to longer stiff inclined hairs, 

 the median and the broad and anteriorly interrupted sublateral vittae, 

 composed of short broad scales; scutellum with small short dense 

 scales broadly along the middle; elytra less than a third longer than 

 wide, rapidly and very obtusely rounded at apex, parallel, barely a 

 fourth wider than the prothorax, the strong coarse anastomosing 

 rugosity interspersed with fine punctures bearing small yellowish 

 squamules, which are four times as long as wide, each elytron with a 

 sutural, three discal and a short post-humeral narrow and ragged line 

 of whitish scales, which are short and broad and barely in mutual 

 contact; pygidium large, transversely triangular, with all the sides 

 equally arcuate, the surface very smooth, shining and with very 

 small scales and fine short hairs, becoming dense basally, elsewhere 

 more or less sparse; middle tarsi much shorter than the tibiae. 

 Length 21.0 mm.; width 10.0 mm. Arizona (Grand Canon of the 

 Colorado), Prudden. Female unknown rugosipennis n. sp. 



Middle tarsi longer, the fifth joint shorter than the preceding three com- 

 bined; elytra more sparsely, finely and feebly rugulose, more cir- 

 cularly rounded behind 19 



19 Pygidium subglabrous and polished, with rather fine and feeble, very 

 sparse and subasperulate punctures, each bearing a small slender 

 subdecumbent hair, these hairs without intermixed squamules and 

 becoming rather close-set toward base. Body oval, convex, rather 

 small in size, somewhat shining, castaneous, the abdomen black, 

 pale at tip; vertex with strong deep and close-set punctures, which 

 are smaller and less close on the moderately reflexed clypeus, having 

 a number of moderately long erect hairs and with elongate attenuate 

 T. L. Casey, Mem. Col. V, Oct., 1914. 



