AMERICAN ENTOMOLOGY. 101 



lf%'i>A, sphere, and Aejo^^ neck, in allusion to the form of the 

 thorax. 



Sl'H.ERODERUS STENOSTOMUS. — Specific character. Black; 

 elytra dark cupreous, basal thoracic lines distinct. 



Ci/chrus stenostomus Weber. Obs. Ent. p. 43, Knoch, ueue 

 Beytr. p. 190, pi. 8, f. 13. Schonh. Sys. p. 166. Nobis, Trans. 

 Amer. Philos. Soc. (new series) vol. ii. 72. 



Sphseroderus stenostomus Dejean, Spec. Col^opt. vol. ii. p. 15. 



Drt^c. Head black, glabrous, impunetured : antenna) brownish 

 towards their tips : thorax black, tinged with blue, rounded, widest 

 in the middle, contracted behind ; base narrower than the elytra, 

 punctured; basal edge rectilinear; dorsal line very distinct; 

 basal lines jjrofoundly impressed, obtuse, punctured : elytra dark 

 cupreous, striae numerous, obtuse; interstitial lines narrower 

 than the striae, obtuse ; edge dark blue ; humeral edge not dilated 

 nor reflected : epipleura punctured : pectus punctured at base : 

 postpectus and venter each side at base, punctured. 



Obs. This species is not uncommon in Pennsylvania, I have 

 also received a specimen from Mr. Charles Pickering, taken in 

 Massachusetts. 



The left figure of the plate. 



Spii.iiroderus bilobus. — Specific character. Violaceous; 

 beneath black ; margins not reflected ; basal thoracic lines 

 obsolete. 



Cjjchrus bilobus nob., Trans. Amer. Phil. Soc. (new series) 

 vol. ii. p. 73. 



Sphserode7'us bilobus Dejean, Spec. Gen. Coleopt. vol. ii. p. 16. 



Desc. Body beneath black : head black, with a slight viola- 

 ceous tint : antennae and palpi pale piceous : thorax cupreous- 

 A*iolaceous, polished, broadest rather before the middle, much 

 narrowed behind ; lateral margin not dilated nor reflected ; base 

 depressed and much punctured ; basal lines obsolete ; basal edge 

 rectilinear, not wider than the pedicle of the postpectus ; disk 

 somewhat bilobated, being convex each side, and gradually in- 

 dented in the middle by the dorsal line ; anterior margin de- 

 pressed, and rugose in the middle : elytra cupreous-violaceous, 

 strire numerous, punctured : pectus beneath, postpectus and ab- 

 domen each side, punctured. 



Obs. This is somewhat smaller than the stenostomus, from 



