108 INSECTA. 



Here the antennae are long, setaceous and simple, or at most 

 slightly spinous or furnished with fasciculi of hairs. 



The thorax is always large, very uneven, and hardly wider than it 

 is long. 



DoRCACERUs, Dej. — Cerambyx, Oliv. 



The species of this subgenus are distinguished from all the others 

 by their large A^ertical head, Avhich is almost as wide as the thorax 

 taken in its greatest transversal diameter; plane and densely pilose 

 before. The antennse are very remote. The pryesternum is not 

 raised into a carina, and terminates simply in a point. The scutel- 

 lum is small*. 



Trachyderes, Dalm. — Cerambyx, Fah. 



Where the thorax is large, much wider than tlie head, and the pos- 

 terior (and frequently the opposite) extremity of the prpesternum is 

 raised into a carina ; where the scuttellum is elongated, the elytra 

 are widest at base, and become narrower as they progress towards 

 the extremity ; and where the antennee are not furnished with fasci- 

 culi of hairs f. 



LOPHONOCERUS, Lut. 



Where the head is also narrower than the thorax, and the poste- 

 rior extremity of the prsesternuni is carinated ; but this thorax, as 

 well as the scuttellum, is proportionally smaller. The elytra are 

 widened towards their extremity, or at least do not become narrower; 

 the third joint of the antennae, and the three following ones are fur- 

 nished with fasciculi of hairs X. 



There, the antennae are shorter than the body, and pectinated or 

 serrated. The thorax is transversal and dentated laterally. The 

 elytra are widened posteriorly. 



Ctenodes, Oiiv., Kliicj. § 



Now the thorax, either almost square or cylindrical, or orbicular 

 or nearly globular, is much shorter than the elytra, at least in those 

 in whicli it is extended in width, and the i)r<«sternum presents neither 

 carina nor pointed prolongation at its posterior extremity. The scu- 

 tellum is always small, and the legs are approximated at base. 



A single subgenus, 



Phcenicocerus, Lat., 



Is removed from the following ones by the form of the antennae of 

 the male, the joints of which, commencing with the third, are pro- 

 longed into long and narrow laminae forming a large fascis or fan. 



* Cerambyx barhatus,0\\-v.; Dej.; Catal., p. 105. 



t Schoenherr, Synou. Insect., I. 3, p. 364. 



X Cerambi/x barbicornes, Oliv. ; — Trachyderes hirticornis, Sclicenli. ; — Cerambyx 

 Mrticornis, Kirby. 



§ Oliv., Col., VI, 59, bis, I, 1 ; Schoenb., Synon. Insect. I, 3, p. 3-16 ; — The 

 Ctenodes zonufa, minuta, geniculafa, K]ug, Eutom. Bras., XLII, 1, 2, 3. As the only 

 knowledge I have of these Insects is through drawings, I merely place th'em here 

 from analogy. 



