Memoirs on the coleoptera

CERAMBYCID^E 361
more arcuately dehiscent at apex, the truncature oblique and straight
but less well denned, the sutural angles being very obtuse and somewhat
rounded; posterior elytral spots larger but separated by longitudinal
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 onehalf
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