CERAMBYCIM; 197 



and less pubescent, the punctures separated on the glabrous ele- 

 vations; elytra similar, except that the sculpture is still coarser, 

 subconfluent; abdomen black throughout and polished, finely, 

 sparsely punctate, the last segment (9 ) not parabolic but with the 

 median part of the apex truncate and limited by distinct though 

 obtuse angles, barely as long as the preceding segment; femora and 

 tibiae partially red. Length (cf 9 ) 11.5-17.0 mm.; width 3.8-5.5 

 mm. Colorado (Fraser 8000 feet and in Boulder Co.) and New 



Mexico (Las Vegas) montanum n. sp. 



Form stouter, the coloration more rufous; head with less coarse and dense 

 punctures, the glabrous part of the tempora rather shorter, not quite 

 half as long as the eyes, which are more developed than in any other 

 species, separated by less than twice their own width (of 1 ) or but 

 slightly less (9); antenna? well developed, of the usual structure; 

 prothorax as in montanum but with less coarse or dense punctures; 

 elytra broad, feebly cuneiform, red, with irregular blackish macu- 

 lation, the punctures unusually deep, coarse and contiguous though 

 relatively not so coarse as in montanum, the humeri less prominent; 

 abdomen red, with black segmental margins and median line, the 

 punctures not so fine or sparse and more rugulose than in montanum, 

 the fifth segment ( 9 ) more narrowly and arcuately truncate medially. 

 Length (cf 9 ) 14.5-19.0 mm.; width 5.0-6.3 mm. Mexico (Guer- 

 rero) *mexicanum n. sp. 



There are certain very marked sexual differences in the conforma- 

 tion, sculpture and vestiture of the last dorsal abdominal plate of 

 the female, and in this feature the distinction between mexicanum 

 and thoracicum, for example, is well marked, the plate being large, 

 concave, medially channeled and feebly pubescent in thoracicum 

 and smaller, more convex, not channeled, densely pubescent and 

 apically bilobed in mexicanum. These characters, in conjunction 

 with those mentioned above, seem to show that there are a number 

 of true species in this genus, in spite of the universally rather 

 similar habitus scarcely more marked, however, than in Omophron 

 or Heterocerus. 



Pyrotrichus Lee. 



This genus was referred by LeConte to the tribe Encyclopini, 

 differing from Lepturini in a rather indefinite character relating to 

 the slope of the frontal part of the head, w r hich in my opinion is 

 not sufficient for tribal distinction. Of the type named vitticollis 

 by LeConte, I have a very good pair taken in Alameda Co. The 

 following, from southern California, differs in several important 

 features : 



