r i 



LeConte.] HYLUHGIM. 



Group IV. 



This group consists of two genera, represented by very small species of 

 elongate form, which agree with Hylastes in general appearance and sculp- 

 ture, but differ by the beak being much shorter, and the prosternum very 

 short and not excavated. The genus Crypturgm has been usually associated 

 with the Tomicini, on account of the slender tarsi, but it makes a notable 

 exception to the other members of that tribe by the large exserted head, 

 and the absence of the hood-like prolongation of the prothorax. I have, 

 therefore, thought it best to remove it from that position, and place it with 

 Dolurgus, as a separate group. Though differing in the antennal club, 

 which is solid in Crypturgus, and annulated transversely with the first 

 joint corneous in Dolurgus, these two genera are otherwise closely related, 

 and differ remarkably from neighboring forms by the small number of 

 joints in the funicle. The prothorax is elongate-oval, rounded in front, 

 nearly truncate at base; the scutellum is very small, not depressed, and the 

 basal edge of the elytra is not elevated. The elytra are elongate-cylindri- 

 cal, with the posterior declivity convex; the striae are well marked, and 

 strongly punctured; the interspaces narrow, finely punctulate and slightly 

 pubescent. The ventral sutures are straight and deep; the first and fifth 

 segments are longer than the others. The prosternum is very short, not 

 excavated; the front coxae are contiguous; the tibiae are dilated, and finely 

 serrate; the terminal spur is very small; the tarsi are slender, with the 

 third joint not dilated. 



Antennal club solid; funicle 2-jointed CRYPTURO-US. 



" annulated; funicle 3-jointed DOLURG-US. 



CRYPTURQUS Er. 



1. O. atomus Lee., Tr. Am. Ent. Soc. 1868, 152. 



Canada, Massachusetts, New York; under bark of dead pine branches. 

 Length 1 mm. ; .04 inch. 



DOLURGKJS Eichhoff. 



1 D. pumilus Eichh., Berl. Ent. Zeitschr. 1868, 147; Chapuis, Mem. Soc 

 Roy. Sc. Liege, 1869, 80; Hylastes pumilus Mann., Bull. Mosc. 1843, 297; 

 ibid. 1852, 356; Aphanar thrum \purn. Lee., Tr. Am. Ent. Soc. 1868, 152. 



Alaska. Examination of specimens of Aphanarthrum subsequently ob- 

 tained, shows that my reference of this species to that Madeiran genus was 

 incorrect; there is no resemblance between them, except in the form and 

 number of joints of the antennae. Eichhoff describes the funicle as 4-jointed, 

 but the error is corrected by Chapuis. Length 1.8 mm. ; .07 inch. 



Group V. Hylastes. 



In this group a reversion is made towards Cossonida and some tribes of 

 CurculionidcB, in the antennal funicle and club, the excavated prosternum, 

 and the antennal grooves of the beak, which, though short and stout, is 

 more developed than in any other Scolytida. The tibiw are, however, 



