Coleopterological Notices, VI. T6Y 



the polished surface tniuiitely, not densely punctate and not entirely con- 

 cealed by the vestiture; basal tomentose line wide laterally but subobsolete in 

 the middle; horn very broad and strongly developed, one-half as wide as the 

 pronotal disk in the female, slightly narrower in the male, not constricted at 

 base, rounded, finely deutellate, densely asperate, the crest moderately ele- 

 vated and defined by a somewhat broken elevated margin laterally, not de- 

 fined at the apex. Elytra about twice as long as wide in the male, rather 

 shorter in the female, slightly wider at apical third and nearly twice as wide 

 as the prothorax, rounded at apex in both sexes; humeral impression very 

 feeble, the scutellar obsolete; disk finely and closely punctate but not very 

 dull, the pubescence dense, even, whitish and somewhat coarse; erect setiE 

 abundant, moderate in length. Length 2.7 mm. ; width 0.8 mm. 



Texas (Galveston). 



This species is also allied to monodon, differing in its smaller 

 size, narrower form, larger thoracic process, whiter pubescence, 

 larger eyes and still more minute and much denser el3'tral punc- 

 tures; the sides of the prothorax are more oblique anteriorly, the 

 horn being much more gradually formed than in monodon. It is 

 represented hy three specimens, in which the sexual characters 

 are very feeble. 



IV. desertus. — Eather stout, slightly shining, pale yellowish-testaceous 

 throughout, the elytra with a small spot at each side of the suture near the 

 base, and a transverse zig-zag fascia behind the middle, strongly produced an- 

 teriorly along the suture beyond the middle, frequently subuniting by a feeble 

 ray with each of thesubbasal spots; sides behind the humeri faintlj' darkened. 

 Head subeciual in width to the prothorax, densely pubescent, minutely punc- 

 tate, reticulate, somewhat dull, the eyes rather large, equal in length to the 

 tempora; antenna? slender, slightly incrassate, fully two-fifths as long as the 

 body. Prothorax rather small, globular, finely and simrsely punctate, shining 

 through the somewhat dense vestiture, the basal line dilated at the sides; horn 

 well developed, diii'ering somewhat noticeably in the sexes; in the male smaller 

 and narrower, more acuminate, not at all constricted at base and coarsely, 

 deeply dentellate, in the female larger and broader, feebly and finely deutel- 

 late, broadly rounded and almost entire toward apex, feebly narrowed at base; 

 crest abrupt, strong, limited throughout by a strongly elevated, acute and en- 

 tire ridge. Elytra distinctly less than twice as long as Avide, twice as wide as 

 the prothorax, broadly rounded behind in both sexes, the sides parallel and 

 almost evenly arcuate throughout; humeral impression very feeble, the 

 scutellar wanting; disk densely, deeply and rather coarsely punctate, the de- 

 cumbent pubescence coarse, whitish, moderately dense, the erect setaj long, 

 very abundant, coarse and conspicuous. Under surface densely pubescent as 

 usual. Length 2.7-3.5 mm.; width 1.0-1.15 mm. 



Arizona (Tu9son). 



This is a well marked species of the monodon group, easily' dis- 



