Memoirs on the coleoptera

64
MEMOIRS ON THE COLEOPTERA
they are inserted at the extreme sides and front of the head and at
only a slight distance before the eyes, which are large, rather
convex, evenly oval and shorter than wide. The male is smaller
and narrower than the female.
Of this anomalous genus there seem to be five species and a few
subspecies in my collection, which may be described as follows:
Elytra even in surface or with but feeble traces of inequality, evenly
punctured
2
Elytra with irregular indentations, which for the most part assume a
linear arrangement, the indentations having some punctures irregularly
placed which are slightly larger than the . regular punctuation. 4
2 Color always pale castaneous; form oval, shining; head well developed,
not coarsely, evenly punctate, the eyes prominent; antennae very
long and slender, almost perfectly filiform, pale ochreous, the penultimate
joint much elongated, the second shortest, one-half as long
as the third as usual, the latter longer than any of the succeeding
joints except the last; prothorax convex, scarcely twice as wide as
long, the sides moderately converging and feebly, very evenly arcuate
from base to apex, the punctures fine, separated by two to four times
their diameters, barely at all stronger or closer laterally; elytra a little
more than a fourth longer than wide, widest at about the middle,
where they are nearly one-half wider than the prothorax, the sides
parallel and very evenly rounded, very obtusely and broadly rounded
at apex, the punctures like those of the pronotum though a little
larger and more indefinitely impressed as a rule; under surface
shining, glabrous, finely, sparsely punctured, the metasternum more
coarsely and closely laterad. Length (cf , 9 ) 7.7-9.0 mm. ; width 4.7-
5.5 mm. California (northern coast regions). Abundant. [Am-
phicyrta chrysomelina Er., Germ. Zeitschr., IV, 1843, p. 40].
chrysomelina Erichs.
A Similar to the preceding but more elongate and more oblong, the
head similar, the antennae even a little longer, extending still further
behind the base of the elytra; prothorax somewhat wider, more
than twice as wide as long, the similarly arcuate sides rather more
strongly converging from base to apex, punctured as in chrysomelina,
the scutellum a little larger, acutely ogival, closely punctate;
elytra more elongate and more oblong, at the middle barely twofifths
wider than the prothorax, the sides parallel and nearly
straight, rounding gradually basally and apically, the apex still
more broadly rounded, similarly punctured. Length (9) 9-3
mm.; width 5.6 mm. California (coast regions north of San Fran-
cisco) oblonga n. subsp.
B Similar to chrysomelina but smaller and with a notably smaller
head, the antennae more brownish and with the joints not quite so
elongate, the penultimate (cf) not quite one-half longer than
wide; prothorax formed nearly as in oblonga, rather more than
twice as wide as long; elytra as in chrysomelina but less greatly