PLATTSODES. 199 



which reproduce the markings of species of Proicetla. Again, 

 while some liave the legs long, there are others in which the tarsi 

 are contracted to such an extent as to consist of only four visible 

 joints (genus Callinomes). 



Owing to their aberrant structure these forms are generally 

 regarded as constituting a group of higher rank than the groups 

 of Ceto:^iini, but the iuquilines of Ants and Termites in very 

 diffei-ent tribes of beetles are subject to certain profound modi- 

 fications which tend to obscure their real affinities and suggest 

 relationships which are only apparent. It is possible that the homo- 

 geneity of the Cbemastochilina may to some extent be due to 

 convergence brought about by similarity of environment. AVest- 

 wood considered the group to be most nearly related to DipJognatha 

 and Protcptia, and Macroma as forming a link with those genera ; 

 but in my opinion the point of contact is to be found rather with 

 the OxYTHYREiuES, through such genera as Spilophorus and 

 Cymopliorus, and Macroma is rather an isolated form. 



Table of tJie Genera. 



1 (6) Base of pronotum sharply excised 



before the scutellum. , 



2 (5) Terminal sph-acles slightly elevated, 



not spiuose. 



3 (4) Pygidium protuberant Platysodrs, p. 199. 



4 (3) Pygidium vertical Spilophorus, p. 201. 



o (2) Termiual spiracles sharply spinose. . . . Cymophorus, p. 203. 



6 [\) Base of pronotum not sharply excised 



before the scutellum. 



7 (14) Body not very compact : prothorax not 



very broad at base. 



8 (13) Tarsi 5-jointed. 



9 (12) Bodv clothed with variegated tomen- 



tum. [p. 204. 



10 (11 ) Head flat Pabapilixurgus. 



11 (10) Head concave behind ( S horned) Goliathopsis, p. 205. 



12 (9) Bodv naked, black or very dark red . . Ccexochilus, p. 206. 



13 (8) Tarsi 4-jointed Callinomes, p. 215. 



14 (7) Body verv compact: prothorax very 



Inroad at base '. Macroma, p. 217. 



Genus PLATYSODES. 

 Platysodes, Westw., Tim. Ent. O.ron. 1874, p. 23. 



Type, Platysodes verloreni, Westw. (Java). 



Eange. Java and Assam, 



Very flat above, moderately elongate and very smooth, bare 

 and shining above and beneath. Head broad and clypeus short, 

 with a straight, reflexed front margin. Prothorax very transverse, 

 with the base excised in the middle. Elytra rather broad at the 

 shoulders, slightly sinuated between them and narrow at the 



