AMERICAN COIiEOPTERA. 5 



or rounded form and never tomentose at tip, but smooth and shining. 

 The sculpture of both species is extremely variable, and has caused 

 them to be unnecessarily divided. 



T. snberosns. Fab. Sj'st. Ent. p. 31; Harold, loc. cit. p. 119: crenatus, 

 Oliv. Ent. 1, 4, p. 7, pi. 1. flg. 4 ; Beauv. Ins. p. 176, pi. 4b, flg. 6; denticufatun + 

 Beauv. loc. cit. fig. 7, 8; alternatus, Say, Bost. Journ. 1, p. 179; punctatus % Lee. 

 Journ. Acad. 1S54, p. 215. 



This is the species so long known in our cabinets under the latter 

 name. 



The thoracic sculpture is similar to that of nionachtis, but the tuber- 

 cles are much less elevated and less distinctly marked. The sides of 

 thorax are rounded and the emargination in front of the hind angles 

 broad and not nearly as deep as in monachus, etc. The elytral tuber- 

 cles, even in the best marked specimens, are of but slight elevation, 

 and between them are slight tomentose patches. The intervals are 

 biseriately punctured. There is scarcely any trace of subapical urn- 

 bone. Length .40 — .66 inch ; 10 — 17 mm. 



Varieties occur with scarcely any elytral tubercles, the only sculp- 

 ture remaining being the punctures, and in which the surface coating 

 is entirely absent so that the specimens are black and shining. 



I have specimens before me from every section of our country ex- 

 cepting California and the region to the north. It occurs in the Pen- 

 insula of Lower California and thence southward to Patagonia. 



T. punctatus. Germ. Ins. Spec, Nov. p. 113; Harold, loc. cit. p. 124; mor- 

 sus, Lee. Proc. Acad. 1854, p. 216; var. integer, Lee, var. tesselntus, Lee. loc. cit. 



The thoracic sculpture is much more distinctly marked than in any 

 of the forms of the pi'eceding species, and in fact approaches more 

 nearly that of scutellaris, not only in form but also in the glabrous 

 summits of the tubercles. The elytral tubercles are oval, moderately 

 elevated, with tomentose space between them, and placed at a distance 

 from each other greater than the size of the tubercles. The sculpture 

 is of course somewhat variable and several varieties may be noted. 



Var. integer^ Lee. — Sides of thorax with scarcely any evidence of 

 the notch near the hind angles. Elytral tubercles forming five princi- 

 pal series, between which are smaller tubercles not very evident, and 

 the intervals slightly wrinkled. 



Var. morsus, Lee. — Sides of thorax posteriorly feebly notched. 

 Elytral sculpture similar to that of iatfger. 



Var. tesselatus, Lee. — This is the larger form, and its general aspect 

 resembles scutellaris. The sides of the thorax have a mere trace of 



