154 Mr. D. Sharp on 



In this species the thorax is about one-fourth the length 

 of the elytra, whereas in G. rusticus it is about one-fifth. 

 On measuring two specimens of about equal size I find 

 them to be, C. coreanus: thorax 8f, elytra 15i mm. 

 long. G. rusticus : thorax 2f , elytra 15 mm., and these 

 proportions persist (with some variation) in the individuals 

 of different sizes of G. nislicus. The head and thorax of 

 G. coreanus are also considerably narrower, and the 

 antennas more slender. The length of the thorax is 

 4§ mm. The sculpture of this part is denser and finer 

 than it is in G. rusticus. The scutellum is narrower than 

 in C. rusticus, almost flat, with a slender polished line 

 along the middle. 



Although I have only one mutilated female of this form 

 I have little doubt that it represents a species closely allied 

 to G. rusticus but distinct. The structural characters 

 appear to agree with those of C, rusticus. It should be 

 noted that the Japanese form of G. rusticus is very 

 different from C. coreanus. 



Criocephalus obsolettjs, Randall. 



Criocephalus obsoletus, Leconte, J. Ac. Philad. ser. 2, II, 



p. 196 [ = obscurus, id. p. 36]. ! 

 Criocephalus mexicanus, Thomson, Classif. Longic. 1860, p. 



260; Bates, Biol. Cent. Amer. Col, V, p. 15. 



This species is extremely near G. rusticus, but will 

 probably prove to be distinct. I have only one specimen 

 at my disposal. The sculpture of the upper-surface is 

 rather coarser. The thorax has a slight angulation at each 

 side ; the second joint of the antenna is a little longer, 

 and the scutellum is broadly impressed. 



Hah. N. America : widely distributed and apparently 

 not uncommon in Mexico, " in pine forests at the higher 

 elevations." 



I have followed Mr. Gahan, in his arrangement of the 

 British Museum Criocephalus, in considering G. mexicanus 

 of Thomson and Bates to be a synonym of G. obsoletus. 



For remarks on the North American species generally 

 see under G. nubilus. 



Group 2. 



Labium with a pencil of hairs placed in a fovea in the 

 middle near the front. 



