OP PHILADELPHIA. 817 



short, robust, filiform, white remote hairs : head transversely in- 

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

 profoundly impressed abbreviated frontal line : antennae, termi- 

 nal joint oval, acute : thorax inequal, widest in the middle, punc- 

 tures dilated, preceded each side by small tubercles; anteriorly 

 profoundly excavated, for the reception of the proboscis : elytra 

 with double series of dilated punctures, each puncture preceded 

 by an obtuse, slightly elevated tubercle, and each double series of 

 punctures above separated by a slightly elevated interstitial line : 

 humeral angles projected forwards, and embracing the lateral 

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



Length seven-twentieths of an inch. 



Male more than one-fifth of an inch. 



Not uncommon near the head waters of the Arkansa river; 

 where I obtained a few specimens, when with' Major Long's party. 



It is remarkable by the profound excavation iu the anterior 

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

 also do not perfectly agree with [255] those of the genus; these 

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

 genus, which may be named . 



[The type of Lrthodns; afterwards named Thccesterims by Say; 

 ante 1, 267. — Lec] 



BOSTRICHUS Fabr. [TOMICUS Latr.] 



1. B. EXESU8. — Rufous; elytra excavated at tip, each six or 

 eight-toothed. 



Bostrichus exesus Melsh. Catal. 



liody with short, numerous, ochraceous hairs : head ferruginous, 

 with numerous small elevations : antennae, club rather large : 

 thorax ferruginous, rough, with numerous elevated points before ; 

 behind with rather distant punctures : elytra darker rufous than 

 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. 



P]ats a straight, zig-zag, or waved passage between the bark 

 and wood of the yellow pine, (^Piims 7m'tis Michaux.) when cut 

 1826.] 



