THYCE AND POLYPHYLLA 327 



each more densely squamose, the two inner vittae extending to apical 

 fourth, the outer less distinct but entire, bending around the apex 

 almost to the suture; body beneath as in cavifrons. Length 27.5 mm. 

 Texas (one specimen, found on the Rio Grande)., .subvittata Lee. 

 A Apparently similar to the preceding but larger and with much less 

 developed outer vitta of the elytra, pale ferruginous, shining, 

 cylindric, convex, not very stout, the vestiture sparse, white and 

 squamiform; vertex strongly, closely punctate, with dense scales 

 laterally and long erect brownish hair, the concave clypeus much 

 constricted at base, with very prominent angles and broadly 

 bisinuate apex; antennal club three times as long as the stem; 

 prothorax evidently more than twice as wide as long, the sides 

 strongly but obtusely angulate behind the middle; surface with 

 rather coarse and sparse but shallow punctures, each with a large 

 scale, the scales dense in the impressed median line and also in a 

 short subbasal vitta near each side; erect hairs distinct throughout 

 medially, more abundant apically, the hairs borne by the reflexed 

 margins unusually short and posteriorly reclined ; scutellum densely 

 squamose medially, except at apex, and also with some scales 

 laterally; elytra nearly one-half longer than wide, a fifth or sixth 

 wider than the prothorax, circularly -rounded behind, the scales 

 everywhere sparse, except in the two inner very ragged and more 

 or less discontinuous dense vittae, the outer dense vitta wholly 

 wanting except posteriorly, where it sometimes curves around the 

 apex almost to the suture, the latter densely squamose as usual; 

 scales about three times as long as wide; pygidium with small, 

 sparse and unevenly distributed scales; abdomen concolorous, 

 sparsely squamose, densely at the segmental apices, the erect 

 hairs sparse; anterior tibial teeth all very strong; middle tarsi 

 not quite as long as the tibiae; last palpal joint with an elongate and 

 well defined flattened area from basal sixth to apical fourth. 

 Length 28.0-30.0 mm.; width 12.7-13.3 mm. Two examples. 

 Female larger, still more shining and much more sparsely squa- 

 mose than the male, the head and clypeus much more sparsely 

 punctate, the latter more parallel, with less expanded apex; 

 antennal club as long as the three preceding joints combined, 6- 

 jointed, the inner joint two-thirds the length of the others; pro- 

 thorax formed as in the male but more convex and with extremely 

 remotely scattered punctures, each bearing a similar scale, the 

 dense median line finer, the sublateral vittae barely traceable; 

 scutellum glabrous, excepting an isolated spot of dense scales at 

 the middle; elytra without trace of vittae and only with very small 

 and extremely remotely scattered scales, the suture dense as usual; 

 pygidium glabrous and more convex along the middle, also gla- 

 brous sublaterally, elsewhere with small and remotely scattered 

 scales; hind tarsi slender, three-fifths as long as the tibiae, the 

 intermediate broken in the type; last joint of the maxillary palpi 

 not differing much from that of the male. Length 32.0 mm.; 

 width 14.0 mm. One specimen. 



Texas (near El Paso), Dunn bisinuata n. subsp. 



