the genus Griocephalus. 147 



good for the male which has longer antennae.* Even in the 

 female the antennas are not shorter than they are in the 

 N. American Griocephalus asperatus, to which species 

 Megasemum has a great resemblance. Megasemum differs 

 however in the form of the presternum, which is concave in 

 profile instead of convex as in certain Griocephalus, or flat 

 as in other species. It has moreover the clypeus much 

 more elongate, the antennas more distant from the man- 

 dibles and the eyes not extended to the under-surface of 

 the head. 



I describe also a new genus, Gcphalallus, that is closely 

 allied to both Megasemum and Griocephalus. The four 

 genera in question form a natural group to be called 

 Griocephalinie, distinguished from the Aseminie by the 

 presence of only one spur on the front tibiae. 



The four genera of Griocephalinie may be distinguished 

 as follows — 



(1) Griocephalus. Terminal joint of palpi only moder- 



ately broad at tip ; presternum protuberant in 

 front, or flat ; clypeus short. 



(2) Gcplialocrius. Terminal joint of palpi very broad at 



the apex ; presternum, nearly flat ; clypeus very 

 short. 



(3) Megasemum. Terminal joint of palpi only moder- 



ately broad ; prosternum slightly descending ; 

 eyes not extended on under-surface of the head. 



(4) Gephalallus, n. g. Terminal joint of palpi not very 



broad at tip ; prosternum descending ; eyes ex- 

 tending to under-surface of the head. 



The Griocephalinie should come at the beginning of the 

 subfamily Ceramhycides, as being one of the most primitive 

 forms of Longicorn Coleoptera. The only other genus of 

 Longicorns that I have found to agree with Griocephalinie 

 as to the unicalcarate tibiae is the genus Philus, which 

 forms an annectant link between Geranibycides and 

 Prionidcs. This character is not to be looked on as 

 primitive. The primitiveness of Griocephalus depends not 

 on such points as this, but on the fact that it differs but 



* The male of Megasemum has not yet been described. It is 

 similar to the female but has the antennas longer and much more 

 hairy. I have seen only one specimen of this sex, it is in the British 

 Museum Collection. For my knowledge of the female I am indebted 

 to Mr. George Lewis, who met with the species in Japan. 



