318 The Philippine Journal of Science 1915 



own inclinations as to whether they dub these groups genera or 

 subgenera. 



It is doubtful if any of the species under Idiocerus in the 

 Fauna of British India are typical Idiocerus, and it is impos- 

 sible from the meager descriptions there given properly to refer 

 all of them. Idiocerus niveosparsus is apparently a Chunra, I. 

 clypealis is an Idioscopus, and /. unimaculatus is apparently a 

 Pedioscopus. The remainder of the species there described 

 appear, from the color descriptions, to be different from anything 

 known to me in the Philippines. 



The structure and sculpturing of head, the proportions of 

 head, pronotum, and scutellum, the venation of tegmina, the 

 sculpturing of scutellum, and the form of genitalia must be 

 fully described or figured for these species, or their certain 

 identification will be impossible. Some of the species are re- 

 markably similar in coloration, and some are very variably 

 colored. Some of the species show a remarkable sexual di- 

 morphism in colors, particularly on the face, to which I have 

 called attention in the following descriptions. 



There are few single characters which could be used for safe 

 generic separation in the Idiocerini, since most of the characters 

 are subject to more or less variation or even lapse in abnormal 

 cases. The average condition must be used, and the general 

 habitus and general census of characters must be constantly 

 considered. The habitus does not always lend itself to clear 

 description, but is readily appreciable in figures or specimens. 

 The following synopses are not comprehensive and are intended 

 only to show the relationships of the forms occurring in the 

 oriental fauna, 



BYTHOSCOPIN^C 



Synopsis of the tribes. 



a}. Tegmina with an appendix (usually very large) ; pronotum with a very 

 narrow connection with propleuras, or a visible connection lacking; 

 head usually wider than pronotum, rarely not as wide or only as wide. 



Idiocerini. 



a^ Tegmina usually without a distinct appendix, or, if with a very small 



and narrow one, then vertex usually considerably longer at middle 



than at sides; pronotum usually broadly connected with propleurae, a 



carina usually separating the two. 



6\ Head about as wide as, or wider than, pronotum; as seen from above 



often strongly angulate; face about as long as wide or longer; 



supra-antennal ledges usually very weak; the scrobes usually 



shallow Agalliini. 



6°. Head usually distinctly narrower than pronotum; as seen from above 

 usually very broadly rounded; face wider than long; supra-antennal 

 ledges very strong; antennal scrobes deep Bythoscopini. 



