CERAMBYCIOE 207 



yellow, except the tibiae, tarsi and antennae from the second joint 

 outward, which are black. The elytra are peculiarly punctato- 

 rugose and opaque, which, with the remarkable prothorax, renders 

 schaumi very distinct, in fact unique, in facies. 



Group III. 

 Subgenus Stenocorus Fabr. 



This subgenus differs decidedly from all the others in our fauna 

 in being very plastic, indicating a geologically more recent origin, 

 the remarkable diversification of form being due also to its generally 

 mountainous and climatically varied habitat; only two species so 

 far as known inhabit the regions east of the Rocky Mountains. 

 The very numerous species and subspecies may be characterized 

 as follows: 



Elytra obliquely truncate at tip, sometimes very narrowly; prothorax 



generally elongate or at least fully as long as wide 2 



Elytra each narrowly and evenly rounded at tip, the sutural angle 

 rounded or very obtuse; prothorax short, with the lateral protuber- 

 ance less developed 12 



2 Elytra vittate 3 



Elytra unicolorous 7 



3 Elytra blackish, with basal, lateral and apical margins rufo-piceous; 

 beneath black, the abdomen, antennae, palpi and legs rufo-piceous; 

 head and prothorax black; punctures fine, the elytra rugose. Length 



17.5 mm. California (Tejon) nubifer Lee. 



Elytra more regularly vittate 4 



4 Elytra wholly black, with a fine pale marginal vitta. Male lather 

 stout, the elytra strongly cuneiform, flat above; body, legs and anten- 

 nae deep black throughout, except the marginal vitta and the ab- 

 domen which is wholly bright rufous; head densely punctato- 

 rugose, subquadrate, the sides behind the eyes at first feebly con- 

 verging then more strongly to the base, there being a very evident 

 basal constriction; antennae very nearly as long as the body; pro- 

 thorax longer than wide, broadly biconstricted and rather acutely 

 tuberculate at the sides, but slightly narrower at apex than at base, 

 finely, closely punctate and with short gray pubescence, bristling 

 with long erect hairs laterally; elytra becoming very prominent 

 laterally toward the humeri, much narrowed at apex, the oblique 

 truncature with a spiniform sutural angle; pubescence short, de- 

 cumbent, even, streaming obliquely from the suture, coarser and 

 more distinct in about inner half, extremely minute elsewhere, the 

 marginal pale line narrow, even, well defined, extending from base 

 very nearly to the apex; legs not very slender, the anterior and middle 

 tarsi broader than usual. Female not differing much from the male, 



