AMERICAN ENTOMOLOGY. 101 



I 



2p*7/>* 7 sphere, and Afyoy ; neck, in allusion to the form of the 

 thorax. 



Spii.eroderus STENOSTOMUS. — Specific character. Black; 

 elytra dark cupreous, basal thoracic lines distinct. 



Cychrus stenostomus Weber. Obs. Ent. p. 43, Knoch, neue 

 Beytr. p. 190, pi. 8, f. 13. Schonh. Sys. p. 106. Nobis, Trans. 

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



Splieeroderus stenostomus Dejean, Spec. Coleopt. vol. ii. p. 1.3. 



Desc. Head black, glabrous, impunctured : antennas 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 profoundly impressed, obtuse, punctured : elytra dark 

 cupreous, striaa numerous, obtuse; interstitial lines narrower 

 than the strias, 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. 



Tbe left figure of the plate. 



Sph.eroderus bilobus. — Specific character. Violaceous; 

 beneath black ; margins not reflected ; basal thoracic lines 

 obsolete. 



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

 vol. ii. p. 73. 



Sphseroclerus bilobus Dejean, Spec. Gen. Coleopt. vol. ii. p. 16. 



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

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

 violaceous, 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, 

 strice nunier. ;us, punctured : pectus beneath, postpectus and ab- 

 domen each side, punctured. 



Obs. This is somewhat smaller than the stenostomus, from 



