of the Oroup CerambjciiiEe. " 251 



protliorax and their truncated elytra. Trirachys, Hope, is 

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

 furnished on each side witli a conical spine ; the third to fifth 

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

 minutely) spined at their outer apex, aud the renuiiuing 

 joints are unarmed. 



The species of the present genus have up to now been 

 placed in either Neocentmhyx or Facliydissus^ and a good deal 

 of confusion exists in their nomenclature. The following 

 synopsis of their characters may prove useful : — 



§ A. Prothorax strongly and more or less 

 regularly transversely wrinkled. Disk 

 usually without a central smooth space. 



Antennas 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 ] . JS". aurifaher, White. 



Joints of the antennne 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. yE. achilles, Thoms. 



Antennas 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. JE. Marice, Thoms. 



§B. Prothorax more or less irregularly 

 wrinkled above. Usually with a central 

 smooth space. 



Form broad aud robust. Intergeual groove 

 directly transvei-se or very feebly bisinuate. 

 Pronotum with two obliquely longitudinal 

 impressions, limiting a central smooth space. 

 Apices of elytra quadrispinose 4. JS. ampliata, sp. n. 



Intergenal groove strongly bowed back- 

 wards. Pronotum with two obliquely longi- 

 tudinal impressions, limiting a central smooth 

 space. Apices of the elytra spinose at the 

 suture, dentate externally 5. /E. induta, Newm. 



As in the preceding, but with the apices of 

 the elytra briefly quadrispinose 6. AC, te-itor, Paso. 



Intergenal groove strongly bowed back- 

 wards. Pronotum without longitudinal im- 

 pressions, but with a small transverse smooth 

 space behind the middle. Antennae (S) less 

 than twice the length of the body 7. AL. perphxa, sp. n. 



