CERAMBYCID^E 361 



more arcuately dehiscent at apex, the truncature oblique and straight 

 but less well denned, the sutural angles being very obtuse and some- 

 what rounded; posterior elytral spots larger but separated by longi- 

 tudinal rays nearly as in interruptus; abdomen narrowly annulate, 

 the legs moderate. Length (9 ) 14.0 mm.; width 4.7 mm. British 

 Columbia (Aldermere), Keen columbianus n. sp. 



Color deep black throughout, the legs and antennae feebly picescent dis- 

 tally; maculation throughout as in undulatus but more developed 

 and pure white, the apical margin of the pronotum broader, denser 

 sublaterally, giving the appearance of an inclosed spot; head and 

 antennae in form and sculpture nearly as in undulatus but with the 

 third antennal joint shorter, not longer than the first; prothorax 

 similar in form and sculpture but larger, just visibly narrower than 

 the elytra, having near basal third a small spot of short sparse 

 white pubescence, which seems never to appear in undulatus; elytra 

 less elongate, more cuneiform, only about twice as long as wide, all 

 the spots clearly separated, the apical truncature less oblique and 

 somewhat arcuate; spots and annuli of the under surface pure white 

 and very sharply defined; legs moderate. Length (cf) 13.3 

 mm.; width 4.2 mm. California (Siskiyou Co.). .albonotatus n. sp. 



4 Third antennal joint scarcely as long as the first; elytra very rapidly 

 narrowed from base to apex, strongly cuneiform, markings all 

 yellow; head and prothorax throughout nearly as in undulatus, 

 the sides of the latter rather more strongly rounded medially and cor- 

 respondingly more sinuate near base and apex; elytra maculate as in 

 undulatus, rather shorter, paler brown in color; legs and antennae 

 pale red-brown but almost similar; apical pale annuli of the abdomen 

 more diffused, especially toward the sides. Length (9) 12.5 

 mm.; width 4.0 mm. Idaho (Coeur d'Alene), J. A. Leyden. 



montanicus n. sp. 



Third antennal joint much longer than the first in both sexes; maculation 

 whiter 5 



5 Form more slender than the first three of the above species, the elytra 

 but slightly narrowed from base to apex and much wider than the 

 prothorax, which is very moderate in size, two-fifths wider than 

 long, with the sides broadly rounded; color dark red-brown, the 

 legs and antennae rufescent; apical and basal pale pubescent margins 

 of the prothorax always narrow, sharply defined, more or less in- 

 terrupted at the middle; elytral spots disconnected in the ante-apical 

 fascia, the ground uniform or sometimes slightly sprinkled with 

 paler hairs, sometimes with longitudinal rays of sparse pale hairs 

 in more than apical half, this being the typical form as figured but 

 not described by Say and the typical form of interruptus as figured 

 by Laporte and Gory; legs moderate, the hind femora extending 

 barely behind the elytra in the male, with the hind tarsi compressed 

 as usual but only of moderate length, the first joint only about one- 

 half longer than the remainder. Length (cT) 10.0-13.5 mm.; width 

 3.0-4.0 mm. Region of the Great Lakes and in Indiana. 



undulatus Say 



Form, coloration and maculation almost exactly as in undulatus, the 



