172 <!En. H. HORN. M. T). 



merely indicated by small tubercles. These forms approach phtin'cornh, 

 and might be mistaken for that species. The elytral markings also vary. 

 The usual form is — a small scutellar spot on each side, a transverse 

 band which begins at the side behind the middle, and approaches the 

 suture by curving forward and sending as hort process along the suture. 

 The median band occasionally divides, so that the sutural portion is sepa- 

 rated from the lateral portion forming a small detached square spot. 

 Rarely the apices of the elytra are slightly piceous. Specimens rarely 

 occur entirely testaceous. 



Occurs everywhere in the United States, also in Lower California. 



X. serratiis Lee. — Testaceous, sparsely clothed witli ratlier coarse pubescence 

 intermixed with erect hairs; elytra with scutellar and post-humeral spots, and a 

 transverse band at apical third extending along the suture, and often interrupted : 

 head somewhat shining, coarsely punctate, sparsely hairy, front ^lightly concave; 

 thorax transversely oval, moderately shining, finely punctate, sparseh' hairy, horn 

 moderately broad, rather widely margined, coarsely serrate at the sides, crest 

 strongly elevated, margined, scarcely serrate; elytra moderately elongate, humei'i 

 distinct, apices variable in the sexes; surface moderately densely punctured, ami 

 clothed with lather coarse pubescence intermixed with erect hairs; body beneath 

 somewhat shining, minutely punetulate, and sparsely pubescent. Length .14 — 

 .20 inch ; 3.5—5 mm. 



The males have the last ventral segment truncate and vaguely triangu- 

 larly impressed. The apices of the elytra of the male are obliquely 

 truncate, the sutural angle obtuse but not rounded, the outer angle ob- 

 tusely dentiform. The apices in the female are conjointly rounded and 

 rather obtuse. The differences in the horn in the sexes is not very great ; 

 in the male the sides are parallel ; in the female arcuate, so that the latter 

 are somewhat broader. 



The elytral markings are of the monodon type with the addition of 

 the post-humeral vitta, the transverse band is, however, more posterior 

 than in that species. The variations in color from this type are in two 

 directions, — an increase of the extent of the piceous markings and a de- 

 crease, so that on the one hand the surface may be entirely piceo-testa- 

 ceous, or entirely pale, without markings. 



This species can hardly be mistaken for any other when the male is 

 present. The dark varieties approach similarly dark forms of aveliora, 

 but the more strongly serrate liorn and the elevated crest will readily 

 separate the two. 



Occurs from Kansas and Colorado, westward to Oregon and eastern 

 California 



