464 INSECTA. 



Some others, but in which the five last joints are alone perfoliate 

 and form a little club, also constitute a separate genus, that of Pen- 

 taphyllus(l). 



Other Insects of this tribe, whose antennae gradually enlarge and 

 are almost entirely perfoliate, are distinguished from Diaperis and 

 Phaleria by the linear form of their body, and their thorax, which 

 forms a long square or is almost cylindrical. They are the 



Hypophl^us, Fab. Ips, Oliv. 



They are found under the bark of trees(2). 



There, the antennse, exposed at base or but very slightly covered, 

 are abruptly terminated by a large oval or ovoid perfoliate club, of 

 at least four joints, the second of which, in those where it consists 

 of five, is very small. The body is ovoid, or almost hemispherical, 

 and convex. In 



Trachyscelis, Lat. Dej. 



The antennse, hardly longer than the head, terminate in an ovoid 

 club of six joints; all the tibiae are broad, triangular, and fitted for 

 digging, and the body short and most usually hemispherical. They 

 bury themselves in the sand on the sea shore(3). 



Leiodes, Lat. Jlnisotoma, Illig. Fab. 



The body similarly short and convex; but the antennae, as long as 

 the head and thorax, are terminated by an oval club of five joints, the 

 second of which is smaller. The tibiae are narrow, elongated or 

 but slightly dilated; the four anterior ones, at least, are spinous(4). 



Tetratoma, Herbst. Fab. 



The body somewhat more elongated than that of the preceding 

 Insects, ovoid, less elevated above; all the tibiae narrow and without 



rate subgenus. The T. ferruginea, Fab., also appears to constitute another by its 

 antennse, which abruptly terminate in a perfoliate club of three joints, the pre- 

 ceding ones being very small and granose. 



(1) See Catalogue, &c, Dej., and Dahl., and for the other species, Fabricius, 

 Olivier, and Gyllenhal. 



(2) Hypopklxus castaneus, Fab.; Panz., Faun. Insect. Germ., XII, 13; H. line- 

 aris, Fab.; Panz., lb., VI, 16; H.fasciatus, Panz., lb., VI, 17; H. bicolm; Fab.; 

 Panz., lb., XII, 14; #. pini, lb., LXVII, 19. In Hypophlsus and Eledona, M. 

 Leon Dufour found but four biliary vessels; in Diaperis there are six. 



(3) Lat., Gener. Crust, et Insect. IV, p. 379. 



(4) Lat., Ibid., II, p. 180; the Anistomx humerale, axillare, castaneum, orbicu- 

 lare, piseum, ferrugineum of Gyll., Insect. Suec, I, ii, p. 180, and I, et scq. 



