2 G. 11. HORN, M. T). 



2. First joint of an ton nte with dark brown hairs; club dark srsibroxu**. 



First joint with rufous hairs; club rufous or cinereous 4. 



4. Elytral tubercles round, their entire surface tomentose iiiOiiacliiiM. 



Elvfral tubercles oblnng, the anterior portion of each glabrous aNpci*. 



3. Sides of thorax near the hind angles rather deeply incised ; elytra not dis- 



tinctly tuberculatp..^ subcrosuJ*. 



Siilos of thorax not or very feebly incised; elytra with well nniikod rows of 

 glabrous tubercles pHH<-«ntus. 



These species liave a facies totally different from thosi; of I lie next 

 group arisinj; principally from tlu^ torni of the thorax as well as its 

 sculpture. The hase of the thorax here is always subpediineulate and 

 consr((U(Mitly near the sides is always distant from the base of the 

 elytra, the hind aniiles are always obtuse and the margin in front of 

 them either with a well marked incisure or a feeble sinuation. These 

 characters are entirely absent in the next group and even in those 

 species in which the base of the thorax is deeply sinuous on each side 

 { Soitor;i\, (ithrrni/nt us, etc.). there is no space between the base of 

 thorax and elytra, when in the normal position. 



T. sCHtellai'i!^, Say, Joum. Acad., 1S2.3, p. 2.38 ; Lee. Proc. Acad., 1854, p, 

 214; Coleop. Kansas, pi. 1, tig. 4; tevnnns, Lee: suti/.ralia, liCc; umbonatus, 

 Lee. loc. cit., p. 21-) ; Harold, Col. Hefte, ix., ^. p. 56. 



By the characters already mentioned this species may be readily 

 known. The three synonyms above cited all indicate well marked 

 varieties which appear to lead insensibly from one to the other. 



A'ar. frxtntiis, Lee. — The largest form. Elytra broadly oval and 

 with rows of tubercles closely placed longitudinally, but with moder- 

 ately well marked intervals between the rows. Sides of thorax near 

 the base with a slight sinuation. 



Var. scutrl/an'n, Say. — Elytra rather less broadly oval. Tubercles 

 more distinct, flatter, not confluent longitudinally but with well 

 marked intervals between them and without any intervals between the 

 rows. Sides of thorax entire. 



Var. siitiirali.s. Lee. --Tubercles more convex and exhibiting a tenden- 

 cy in the rows to alternate with larger and smaller tubercles, which are, 

 however, clo-sely placed longitudinally and laterally. Sides of thorax 

 entire. 



Var. iimljonatiis, Lee. — Elytra distinctly more oblong. Rows of 

 tubercles decidedly alternating, the tubercles rather closely placed but 

 of irregular polygonal form. Sides of thorax entire. The thoracic 

 sculpture CMiisist.s of four oval tubercles usually smooth and shining, 

 placed along the basal margin, the central pair somewhat larger; in 

 front of the outer basal tuljcrcie is another of smaller size and less 



