370 SCOLYTID^]. 



[LeConte. 



by a wide gular space. The first and second ventral segments are very 

 large, the others short. 



1. T. flmbricornis, n. sp. 



Slender, cylindrical, yellowish brown. Head (^) shining, flattened, 

 with a small fovea on the vertex. Prothorax longer than wide, sparsely 

 asperate in front and slightly hairy, then not densely punctured for a short 

 distance, and nearly smooth behind the middle, and at the sides. Elytra 

 with rows of small punctures; punctures of the interspaces smaller and 

 more distant, and from them proceed short, clavate, pale bristles in regular 

 rows; declivity convex, not at all impressed or retuse, sutural line very 

 slight. The eyes are transverse, slightly emarginate and coarsely granu- 

 lated. Front tibiae broad from the base, sides parallel, outer edge acute, not 

 serrate. Length 1.8 mm. ; .075 inch. 



Lancaster County, Pennsylvania. Abundant in twigs of hickory; easily 

 recognized by the characters given above. The first and second ventral 

 segments are each as long as the others united; third, fourth, and fifth short, 

 equal, last dorsal slightly visible from beneath. The bristles are not striate 

 as in Hypothenemus, but finely granulated. 



Tribe II. SCOL.YTINI. 



The species of this tribe are easily known by the peculiar conformation 

 of the ventral surface, which is, namely, flattened or concave, and obliquely 

 ascending from the posterior end of the first segment to the fifth ; the first 

 and second segments are closely connate, and the other three are separated 

 by straight sutures, about equal in length, and united are hardly longer 

 than the oblique part of the second segment. The antennal club is pubes- 

 cent on both sides, nearly solid and marked with indistinct but strongly 

 curved, or rather angulated, sutures; the scape is short, the first joint of 

 the funicle rounded, the remaining joints (five in number) closely united 

 forming a pedicel to the club. The thighs are stout, the tibiae rather broad 

 and compressed; the front pair are not serrate on the outer edge, which is 

 quite sharp ; the outer apical angle is armed with a long curved hook, and 

 the inner angle is nearly rectangular but not armed with a spine ; the outer 

 margins of the middle and hind tibiae are feebly serrate, they are truncate 

 at tip, and armed with two spines or spurs at the outer angle, and a much 

 smaller spine at the inner angle ; the tarsi are slender, as long as the tibiae ; 

 the third joint is deeply bilobed, the fourth small, the fifth long, with 

 simple divergent claws. 



The side margin of the prothorax is distinctly defined, a very rare 

 character in Rhynchophora, and the front coxae are separated by the pro- 

 sternum, which is very short in front of the coxae. In some of the species 

 the ventral segments of the $ are ornamented with spines, or acute tuber- 

 cles such as have been already mentioned in Proctorus (p. 212) and Pla- 

 typus (p. 343). 



But one genus represents this tribe. 



