THYCE AND POLYPHYLLA 349 



29 Form oblong-suboval, black throughout, the legs and antennae red 

 and yellow ferruginous respectively; decumbent sparse vestiture 

 pale yellow, the dense vittae white; head short, coarsely and deeply 

 punctate throughout, the vertex with rather abundant erect hair and 

 with dense whiter scales near the eyes; clypeus deeply concave, 

 clothed with long attenuate scales, some very broad along the base 

 and with smaller very dense scales laterally and apically, the apex 

 feebly, subangularly sinuate medially, the angles rounded, the sides 

 thence converging to the base; antennal club between three and 

 four times as long as the stem; prothorax barely twice as wide as long, 

 the sides broadly and feebly subprominent submedially from a dorsal 

 viewpoint, more strongly angulate viewed obliquely; punctures 

 coarse, deep, close-set or sparse at various points, each with a very 

 slender hair-like scale, a little broader near the base, without erect 

 hairs, the vittae moderate, the sublateral broadly interrupted before 

 the middle; scutellum broadly, densely squamose along the middle; 

 elytra rounding behind in apical two-fifths, a third wider than the 

 prothorax, the squamules rather well separated, three to four times 

 as long as wide, separated from the dense white lines by a distinct 

 glabrous interval; pygidium but little wider than long, nearly flat, 

 triangular, very densely clothed with small whitish squamules, 

 mingled with minute and more erect hairs, the squamules nearly 

 wanting along the median line, the sparse hairs remaining, also 

 rather sparser laterally; middle tarsi about as long as the tibiae. 

 Length 26.5-31.0 mm.; width 13.0-14.8 mm. Six specimens. 



Female nearly similar to the male, with the usual sexual differences, 

 the clypeus shorter and much less concave, the antennal club barely 

 more than half as long as the stem; prothorax not quite so short and 

 with the punctures still coarser and generally denser, the squamules 

 not so slender; scutellum similar; elytra rather broader and more 

 sensibly subinflated posteriorly, the vestiture nearly as in the male; 

 pygidium almost exactly as in the male, the squamules rather less 

 slender; the first tooth of the anterior tibiae is distinct but barely a 

 third as high as the second. Length 29.0-34.0 mm. ; width 14.3-16.3 

 mm. Two specimens. 



Mexico (San Luis Potosi) *potosiana n. sp. 



Form (9 ) stouter, oblong-oval, dark castaneous in color throughout, the 

 abdomen not black; integuments rather shining; scattered vestiture 

 yellow and squamiform; head short and broad, the vertex coarsely 

 and deeply punctate, the erect hairs very short and sparse, the scales 

 dense medially, toward apex and near the eyes; clypeus abruptly 

 reflexed at apex, three times as wide as long, the apex arcuato-trun- 

 cate from a dorsal, broadly bisinuate from a posteriorly oblique, 

 viewpoint, the angles distinct, not rounded, the sides subparallel, 

 feebly arcuate, the surface strongly, closely punctate and with 

 narrow pointed yellow scales throughout; antennal club not so 

 thick as usual and three-fifths as long as the stem; prothorax twice 

 as wide as long, broadly angulate at the sides, the angle still visible 

 from a vertical viewpoint, the sides parallel and feebly sinuate 

 basally in the latter case; punctures rather coarse, deep and close- 



