of the Group Cerambjcinse. 251 



prothorax and their truncated elytra. TriracJiys, Hope, is 

 the most nearly allied genus, but in this the prothorax is 

 furnished on each side with a conical spine ; the third to hf th 

 joints of the antennge in the male are distinctly (the sixth 

 minutely) spined at their outer apex, and the remaining 

 joints are unarmed. 



The species of the present genus have up to now been 

 placed in either Neoceramhyx or Pacliydissus^ and a good deal 

 of confusion exists in their nomenclature. The following 

 synopsis of their characters may prove useful : — 



§ A. Protliorax strongly and more or less 

 regularly trausver8ely wrinkled. Disk 

 usually without a central smooth space. 



Antennse distinctly spined in both sexes. 

 Pronotum with two well-marked longitudinal 

 slightly oblique impressions. Intermediate 

 and posterior femora denticulately produced 

 on each side at their apex ] . yE". aurifaher, W^hite, 



Joints of the antennae in the male almost 

 without spines at their outer apical termina- 

 tion. Pronotum with two rather faint longi- 

 tudinal impressions. Femora without teeth 

 at their apex 2, ^. achilles, Thorns. 



Antennae in the male without spines at the 

 outer termination of the joints, with the scape 

 very feebly rugose. Pronotum without lon- 

 gitudinal impressions on the disk or with but 

 the faintest trace of them. Femora without 

 teeth at the apex 3. ^. Clarice, Thoms. 



§ B. Prothorax more or less irregularly 

 wrinkled above. Usually with a central 

 smooth space. 



Form broad and robust. Intergenal groove 

 directly transverse or very feebly bisinuate. 

 Pronotum with two obliquely longitudinal 

 impressions, limiting a central smooth space. 

 Apices of elytra quadrispinose 4. ^. ainph'cda, sp. n. 



Intergenal groove strongly bowed baclt- 

 wards. Pronotum with two obliquely longi- 

 tudinal impressions, limiting a central smooth 

 space. Apices of the elytra spinose at the 

 suture, dentate externally o. ^. induta, Newm. 



As in the preceding, but with the apices of 

 the elytra briefly quadrispinose 6. A'\ textur, Pa.sc. 



Intergenal groove strongly bowed back- 

 wards. Pronotum without longitudinal im- 

 pressions, but with a small transverse smooth 

 space behind the middle. Antennae ( cJ ) less 

 than twice tlie length of the body 7. ^. perpkxa, sp. n. 



