132 On the Coffee-horer of Southern India. 



Gen. Xylotrechus. 

 Xylotrechus, Chevr. Ann. Soc. Ent. Fr. 1860^ p. 456 ; 



Clyt. d'Asie, p. 59 (1863). 

 <iClytus, Fab., Lap. & Gr., et al. 

 =XyIotrechiis (1st div.), Thorns. Essai, p. 221 (1860). 

 := Xylotrechus, Thorns. Syst.Ceramb.pp. 190,424(1864) . 

 Type. — X. Sartorii, Chevr. 



Other species belonging to this genus are Uciatiis, Lin., 

 Chinensis, Chevr., vicinus, Lap. & G., quadrij^e^s, Chevr., 

 ocellatus, L. & G., &c. 



The diagnostic characters given by Mr. Thomson (Syst. 

 Ceramb. p. 424) are as follows : — 



Clytus. Antennce breves, artic. 3° seq. longiore. 

 Prothorax subglobosus, oblongus. 

 Pedes postici elongati, (^ femora postica corpus 

 transientia. 



Clytanthus. ^w^ewice graciles,breve, artic. 3° seq. longiore. 

 Prothorax rotundatus. 

 Elytra apice truncata. 



Prost. append, angusta ; vnesost. append, lata. 

 Corpus elongatum, angustatum. 



Xylotrechus. Frons plus minusve longitud. carinata. 

 Antenna; breves, artic. 3° seq. longiore. 

 Prothorax subovalis. 

 Elytra pavilo brevia. 



Prost. append, angusta; mcsost. append. lata. 

 Pedes postici elongati. 



When it is borne in mind that Mr. Thomson has another 

 genus, Clytosaurus, which comes between Clytanthus and 

 Xylotrechus, it will be seen how very slight are the dif- 

 ferences which separate these various groups. 



The only conclusion at which I arrive with certainty is 

 this — that there is still much to be done with this group 

 of Clytince before their classification can be deemed satis- 

 factory. M. Chevrolat appears to me to have failed to 

 give any distinct characters by which his Anthohoscus, 

 Clytus (true), Xylotreclms, Clilorojihorus, and Sjohcgesthcs 

 can be discriminated ; and whilst grateful for the reduc- 

 tion of these five groups into three, and for the merger 

 of M. Mulsant's EcJii^inccrus and Isotomus, I cannot 

 but feel that Mr. James Thomson has left us in obscurity 

 as to the real boundaries of Clytus, Clytaatlms, and 

 Xylotrechus. 



