176 CHBYSOMELIDJE. 



Subfamily III. CRYPTOCEPHALIN^E. 



Of cylindrical compact shape. Head perpendicular, flat ; eyes 

 kidney-shaped, distant or sometimes touching above ; antennae 

 filiform, in some genera short and with dilated terminal joints. 

 Thorax transverse, subcylindrical, sides and anterior portion 

 strongly deflexed. Scutellum generally triangular, sometimes 

 elongate, lanceolate, in one genus (Dioryctus) not visible from 

 above. Elytra not wider than base of thorax, more or less strongly 

 lobed at sides, not covering pygidium, surface punctate-striate. 

 Legs moderately elongate ; tarsi more or less triangular, first joint 

 sometimes longer than second, claws appendiculate or simple. 

 Prosternum of variable shape, more frequently subquadrate, its 

 anterior edge more or less strongly produced and hollowed for the 

 reception of the parts of the mouth, tbe posterior margin generally 

 concave with the angles produced and pointed. 



Within our limits this is one of the most numerously repre- 

 sented subfamilies of the whole of the Chrysomelidae. It comprises 

 an enormous number of species of neat and cylindrical shape and 

 greatly varied colour and pattern. The species of this subfamily 

 can as a rule be separated from the Clytrince, which they somewhat 

 resemble, by the deeply emarginate eyes and filiform antennae. 



They inhabit all parts of the world. 



Key to the Genera of Cryptocephalinae. 



A. Antennae short, terminal joints widened. 



a. Scutellum invisible from above DIORYCTUS, p. 176. 



b. Scutellum visible. 



a'. Eyes nearly, sometimes completely, 



touching above CCENOBIUS, p. 182. 



b'. Eyes not very closely approximate, 



never touching MELIXANTHUS, p. 267. 



B. Antennae long and filiform, joints not or 



scarcely widened. 



a. Thorax transverse. 



a'. Thorax closely fitted to base of 



elytra, base not margined CKYPTOCEPHALTJS, p. 192. 



b'. Thorax not closely fitted to base of 



elytra, base narrowly margined . . PACHYBHACHYS, p. 265. 



b. Thorax* conical, narrowed in front .... MELINOBIUS, p. 269. 



Genus DIORYCTUS. 



Dioryctus, Suffr. Linn. Ent. xiv. 1860, p. 3 : Weise. Deut. ent. Zeit. 



1903, p. 33 

 Atropidius, Chapuis, Gen. Coleopi. x, 1874, p. 175. 



Type, D. porcidus, Suffr., from Ceylon. 

 Range. India ; Japan ; Malay Archipelago. 



