ANNALS OF THE LYCEUM. 387 



.extended towards the tip, where it gradually approaches the scu- 

 tel; scutel transverse and transversely carinated; beneath 'lark- 

 green, polished on the venter; edge of the postpectus and venter 

 with a dull fulvous line. 



Length seven-twentieths of an inch. 



The quercata Fabr., is described to be green, with a fuscous 

 vitta on the elytra, and a spot on the thorax ; it therefore differs 

 [251] from the present insect. The surface of the elytra ap- 

 pears covered with minute imbricated points, which are more 

 acute and obvious towards the tip. 



[This and the three following belong so Agrilus ; B. ova rcata 

 is totally different, being an Anthaxia. — Lec.] 



3. B. arcuata. — Dark bronze; elytra black; thorax with an 

 elevated line at the posterior angles. 



Desc. Body slender : head punctured, with a longitudinal in- 

 dented line, and obsolete indentation each side on the front : thorax 

 inequal, transversely conflueutly punctured ; an elevated, arcuated 

 line, extends from the posterior angle almost to the middle of 

 the lateral margin : scutel transverse and transversely carinated : 

 elytra indented at base ; at tip rounded and denticulated : be- 

 neath dark greenish, polished, particularly on the venter. 



Length three-tenths of an inch. 



Of a similar form to the preceding species ; but it is altogether 

 destitute of the marginal colored line of the thorax, and those 

 of the elytra; the elevated line of the thoracic also angles distin- 

 guishes it. The imbrication of the elytra is similar to the pre- 

 ceding species. 



4. B. polita. — Cupreous, polished ; thorax with an elevated 

 line at the posterior angles. 



Desc. Body slender, highly polished, cupreous : head ; 

 with green, punctured ; longitudinal indented line obsolete : an- 

 tennae blackish : thorax a little inequal; transversely conflueutly 

 punctured; an elevated arcuated line extends from the posterior 

 angles almost to the middle of the lateral margin : scutel trans- 

 verse and transversely carinated : elytra indented at base ; at tip 

 rounded and denticulated. 



Length rather more than one-fifth of an inch. [ 252 ] 



Found by Mr. Thomas Nuttall on the bank of the Mississippi 



river. In many of its characters it resembles the arcuata, but is 



