CERAMBYCIDAE. 289 



perpendicular, the mandibles short, acute, the palpi somewhat 

 unequal, short, dilated. 



The antenna? are elongate, slender in the 9, thickened at the 

 base in Z ; sparsely punctured, and pubescent, not sericeous. 

 The episterna of the metathorax are narrow, parallel, and have 

 very distinct scent pores near the hind end. Tibiae not carinate 

 in our species. 



This group evidently belongs to the same series as the pre- 

 ceding, with which it connects closely, though assuming a form 

 which is characteristic. The prothorax is very elongate and 

 cylindrical, as in certain Elaphidion, but the antennae are never 

 spinose. 



The two genera belonging to our fauna may be thus distin- 

 guished : — 



Front coxal cavities closed behind. Compsa. 



Front coxal cavities open behind. Heterachthes. 



Of Compsa, two species are found in Lower California ; the 

 genus is easily distinguished by the character given above, and 

 by the joints 3-fi of the antennas being distinctly carinated ; one 

 of the species C. puvclicoUis Lee, is remarkable for the dull 

 color, and coarsely punctured prothorax. 



Group IV. — Curii. 



The singular characters of the two species of Curius Newm., 

 compel us to sepai*ate them afe a distinct group, which is easily 

 recognized by the coarsely granulate eyes, and very strongly 

 clavate thighs, armed beneath with a broad tooth. The form is 

 elongate, in the typical species depressed, dull, and slightly 

 pubescent ; in C. scambzis cylindrical, polished, and glabrous, 

 resembling Ibidion. The front is small, declivous, the antennal 

 tubercles not prominent, the palpi somewhat unequal, the man- 

 dibles small and acute; the antenna? are slender, longer than the 

 body, annulated, finely punctulate and pubescent. The front 

 coxae are globose, prominent, nearly contiguous in C. dentatu^, 

 separated in C. scambus, and the cavities are open behind; the 

 middle coxaj are entirely inclosed by the sterna, and the side 

 pieces of the mesothorax are uiidivided ;* the first joint of the 



* This character is otherwise only known to us in the tribe Ancylo- 

 cerini, also a very anomalous form. 

 19 



