OP PHILADELPHIA. "17 



short, robust, flliform, wliite remote hairs : head transversely in- 

 dented at the base of the very short rostrum, and with a very 

 jirofoundly impressed abbreviated frontal line : antenna*, termi- 

 nal joint oval, acute : thorax inecjual, widest in the middle, jjunc- 

 turcs dilated, preeeded eaeh side by small tubercles; anteriorly 

 profoundly excavated, for the reception of the proboscis: elytra 

 with double series of dilated punctures, each puncture preceded 

 })y an obtuse, slightly elevated tuhercU', and each double series of 

 ])unctures above separated by a slightly elevated interstitial line: 

 liumcral angles projected forwards, and embracing the lateral 

 base of the thorax ; obtuse at tip, and nigged. 



Length seven-twentieths of an inch. 



Male more than one-fifth of an inch. 



Not unconHiion near tlie head waters of the Arkanj^a river; 

 where I obtained a few specimens, when with jMajor ].,ong's party. 



It is remarkable by the profound excavation in the antt^rior 

 face of the trunk, for the reception of the rostrum; the antennae 

 also do not perfectly agree with [255] tho.se of the genus; these 

 and other distinctions would authorize the formation of a new sub- 

 genus, which may be named . 



[The type of Lithoduit; jifterwards named ThecesOnms by Say; 

 ante 1, 2(37. — Lec] 



BOSTKICHUS Fabr. [TOMICUS Latr.] 



1. B. EXESUS. — Rufous; elytra excavated at tip, each six or 

 eight- toothed. 



Bostriifius cxesns Melsh. Oatal. 



Body with short, numerous, ochraceou> hairs : liead ferrugiiiuus, 

 with numerous small elevations : antenna;, club rather large : 

 thorax ferruginous, rough, with numerous elevated points before; 

 behind with rather distant punctures : elytra darker rufous thau 

 the thorax, with punctured .striae ; punctures large, transverse ; 

 posterior declivity excavated, with large punctures, and armed 

 on each side with six or eight teeth ; the first and third being 

 sometimes obsolete, the fifth a little larger. 



Length more than one-fifth of an inch. 



Eats a straight, zig-zag, or waved pas.sagc between the bark 

 and wood of the yellow pine, (^Fi'nvs niUiJi Michaux.) when cut 



1826.] 



