Longicornia Malayana. 259 



The African genera are, however, very distinct and have scarcely 

 anything in common with the Malayan. 



One hundred and ten species occur in the Wallacean collection, 

 which I have distributed into twenty-eight genera. In the following 

 tabulation it has been necessary to adopt characters some of which 

 separate at a long interval nearly allied genera. 



Genera. 

 Mesosternum declivous. 

 Head exserted. 



Prothorax armed at the sides. 



Eyes large, sub-approximate in 

 front. 

 Antennae spinously rugose . . . Balocera, Lap. 

 Antennae smooth. 



Elytra parallel Apriona, Chev. 



Elytra narrowing to the apex Megacriodes, n. g. 

 Eyes of moderate size, not ap- 

 proximate in front. 

 Femora and tibiae compressed .. Sarothrocera, Wh. 

 Femora and tibiae not compressed. 



Elytra toothed at the shoulders Anhammus, Thorns. 

 Elytra not toothed at the 

 shoulders. 

 Prothorax spined at the sides. 

 Scape with a cicatrix. 

 Head subquadrate in 



front Monochamus, Serv. 



Head transverse in 



front Dihammus, Thorns. 



Scape witho!«i a cicatrix. . Orsirfi*, n. g. Aj,--' 



Prothorax only slightly 

 toothed at the sides. 

 Lower lobe of the eye 



vertical Nephelotus, n. g. 



. Lower lobe of the eye 



broadly rounded .... Trysimia, n. g. 

 Prothorax cylindrical, unarmed. 



Posterior legs short Olenecamptus, Chev. 



Posterior legs long Cylindrepomus, Bl. 



Head not exserted Gerania, Serv. 



s 2 



