CERAMBYCID^E 347 



gradually slightly smaller from base to apex, the short hairs cinereous, 

 distinct; legs rufous throughout, gradually more obscure distally; pro- 

 sternum transversely rugulose, very finely, closely punctato-rugulose 

 laterally. Length (9) 10.0 mm.; width 2.3 mm. Arizona (Canon of 

 the Colorado), T. Mitchell Prudden. 



A distinctly isolated species, distinguishable by its coloration and 

 strong punctures. The female prosternum in many species has a 

 feeble inequality of sculpture, suggestive of that so strongly de- 

 veloped in the male. 



Mr. Schaeffer is mistaken in stating (Journ. N. Y. Ent. Soc., 1911, 

 p. 124) that longicollis Csy., is the same as lepidus Horn. Even 

 were his remarks as to the great variability of the sternal sexual 

 characters of the male, strictly an expression of the reality and 

 not due in large part to confounding different species or subspecies, 

 it can nevertheless be proved that longicollis is distinct from lepidus; 

 for the prothorax is not only more elongate than in lepidus but it 

 differs in color, being broadly clouded with piceous laterally, and 

 the elytral punctures are more numerous and, not only not more 

 distinct and closer apically, as stated by Dr. Horn of lepidus, but 

 still smaller than basally and not at all less sparse. The antennae 

 also are much longer, being about three-fourths longer than the 

 body in the male. But, as a matter of fact, the prosternal char- 

 acters of the male are of much importance and, as shown by the 

 material before me, do not vary intraspecifically in the manner 

 stated by Mr. Schaeffer, although there is some variability as in 

 nearly all secondary sexual structures. The difference between 

 longicollis and lepidus in this respect is very great indeed. 



Tribe CLYTINI 



Clytus and numerous allied genera differ from the preceding tribe, 

 not only in the general facies of the body, but in many special 

 characters relating to form of the head, type of ornamentation, 

 antennal structure and other features; the eyes are similarly al- 

 ways very finely faceted and are narrowly emarginate. Disregard- 

 ing the group Anaglypti and the genus Euryscelis, which has 12- 

 jointed antennae, our generic groups of the tribe may be briefly 

 defined in the following manner: 



Basal process of the abdomen bluntly rounded or truncate at apex 2 



Basal process acute 7 



