CERAMBYCHXE 241 



Prothorax evenly and strongly convex, the apex with an elevated and 

 acute marginal bead, behind which there is only an . extremely 

 short and feeble constriction; neck unusually narrowed and elongate; 

 elytra conjointly rounded at tip 2 



Prothorax almost evenly convex but with the apex broadly and deeply 

 constricted; neck shorter and not so narrowed; elytra narrowly 

 truncate at tip 3 



Prothorax tumid laterally on the disk just before the broad basal con- 

 striction, the apical constriction distinct, the subbasal tumidities 

 sometimes feeble, but in discoidea becoming almost spiniform; neck 

 as in the preceding group; elytra narrowly truncate to sinuate at 

 tip 4 



2 Body moderately stout, shining, pale rufo-testaceous throughout, 

 the apical part of the antennal joints and three vittae, sharply defined 

 on each elytron, sutural, marginal and discal, the marginal inwardly 

 dilated near the middle, black; pubescence short, sparse, pale and 

 inconspicuous; head and prothorax very finely, sparsely punctate, 

 the eyes well developed, convex and prominent, the sides behind them 

 strongly oblique and nearly straight to the narrowed neck; antennae 

 very slender, as long as the body; prothorax very slightly elongate, 

 evidently wider than the head, evenly and almost globularly convex, 

 the apex transversely truncate, two-thirds as wide as the base, the 

 sides subprominently rounded just before the middle, the basal 

 angles sharp but not projecting beyond the line of the median promi- 

 nences; elytra a little less than twice as wide as the prothorax and 

 between three and four times as long, subparallel in both sexes, the 

 punctures very coarse, deep, less coarse toward apex, separated by 

 less than their own diameters; abdomen very minutely, feebly and 

 sparsely punctulate, shining and with very short, sparse and in- 

 conspicuous hairs; legs very slender. Length (cf 9 ) 6.5-7.5 mm.; 

 width 1.8-2.2 mm. Pennsylvania and Indiana directa Newm. 



3 Form stout; surface shining, black throughout, the legs and antennae 

 black, the elytra pale tawny-flavate, with a nubilous black streak 

 from the humeri obsolescent behind the middle, the apices and suture 

 black, the black areas sometimes wholly wanting and the elytra 

 occasionally wholly piceous; pubescence short, moderately abundant, 

 pale and distinct; head nearly as in the preceding, being small and 

 rapidly oblique at the sides behind the prominent eyes, but closely 

 and strongly punctate; antennae much less slender and shorter, three- 

 fourths (d 71 ) to three-fifths ( 9 ) as long as the body; prothorax large, 

 very much wider than the head, strongly narrowed at the arcuate 

 and conspicuously constricted apex and deeply, moderately closely 

 punctate, shining; elytra shorter than in any other species, scarcely 

 twice as long as wide, one-half wider than the prothorax, feebly 

 cuneiform, the punctures moderate in size, rather close-set; abdomen 

 shining, finely, sparsely punctulate; legs very slender. Length (cf 9 ) 

 5.2-8.0 mm.; width 2.0-2.8 mm. Colorado, Montana, California, 



Hudson Bay Territory and Siberia pratensis Laich. 



T. L. Casey, Mem. Col. IV, Oct. 1913. 



