AMERICAN PHILOSOPHICAL SOCIETY. 593 



cave curvature : labrum hardly prominent, not visible -wlien 

 viewed from above : antennae very short, not reaching the vertex, 

 the three basal joints together about as long as all the others 

 combined ; thorax in breadth at least [ 160 ] twice the length, 

 with transverse confluent punctures : scutel bright green : elytra 

 with transversely confluent punctures ; serrate from near the 

 humerus ; surface obsoletely undulated : beneath cupreous : an- 

 terior thighs with a prominent acute spine. 



Length seven-twentieths of an inch. 



A small and distinct species. 



[Belongs to Actenodes Lac. Gen. Col. 4, 72. — Lec] 



13. B. IMPEDITA.* — Elytra bluish-green, grooved and punc- 

 tured. 



Inhabits Pennsylvania. 



Head confluently punctured, green with a eupreotis reflection : 

 antennae steel-blue, at base green : labrum green, ciliate at tip : 

 thorax cupreous, with green confluent punctures ; on some parts 

 of the disk the punctures are sparse : scutel oval, regularly con- 

 cave, green ; elytra densely punctured, with five dilated grooves 

 and four elevated lines, the latter sparsely punctured; green, 

 gradually shaded into a blue vitta along the middle ; suture and 

 outer margin cupreous ; tip somewhat truncated : beneath green 

 cupreous. 



Length three-fifths of an inch. 



The specimen was taken near Philadelphia. It i« evidently 

 related to saUshun'ensis, as described by Weber, to decora ¥., and 

 splendens F., of China. But Weber's description states the 

 former to have striated elytra, without elevated lines. The 

 splendens has only three elevated lines on the elytra, and the 

 decora is larger, with the tip of the elytra two-toothed. Neither 

 can it be the striata Oliv., as the elytra are not slightly bidentate, 

 nor are their two inner elevated lines abbreviated. A variety 

 found by my brother, B. Say, in New Jersey, is much tinted 



* Dr. Harris is of opinion that this species, the aundenta of Linnaus 

 and Olivier, and the striata of Fabricius are the same ; and that the 

 decora F. and salisburiensis Weber and Herbst, are identical. The latter 

 differ from the auruhnta L., in not having elevated lines on the elytra. 

 183G.] 38 



