brown; the mandibles shade to black at the tips and at the hinges; 
the eyes are black. 
The adult (fig. 1, 6) is a black, shining, four-winged sawfly, about 
one-third of an inch long, spotted and banded with yellow. The 
original description “ is as follows: 
The adult insect agrees almost exactly with Cephus pygmeus in coloration, 
coming much closer to it in this respect than to any other American species, but 
is in every way more slender and graceful and would never be mistaken for the 
European species. The head is narrower in proportion to the body and is more 
globular when viewed from the side. Viewed from above it narrows more pos- 
teriorly from the eyes than pygmaeus. * * * 
The species may be characterized as follows: 
@ Black; basal joints of the maxillary palpi, large spot on mandibles, two 
spots beneath anterior wings, membranous regions of thorax, small spot on 
lower posterior edge of dorsum of first segment, larger one on second segment, 
band, dentate on basal margin, on apical half of dorsum of third, fifth, and 
sixth segments, and more or less of the lower and apical margin of the re- 
maining segments, lemon yellow. 
Legs black, slender; spot on posterior coxze above, upper side and tip of 
femora, yellow; tibize and tarsi reddish yellow except tips of posterior tibize 
and their tarsi, which are brownish; last joint and claws of middle and an- 
terior tarsi also brownish. 
Antenne 20-21 jointed, longer than head and thorax, slender to joint 7, 
beyond which the articles are shorter and thickened. 
Wings slightly smoky; veins brown except costal and margin of stigma, 
which are yellowish; a small infuscated spot at base of discoidal vein; second 
recurrent vein joins the third submarginal cell near the base of the cell; cross 
veins of lanceolate cell slightly curved and oblique. 
Abdomen not much longer than head and thorax, strongly compressed 
laterally. 
Length, 9-11 mm. 
Exp. al., 16-19 mm. : 
@ smaller and more slender than the 9 ; abdomen less compressed; antennze 
18-21 jointed. Coloration as in Q except a large spot on the clypeus, one just 
below the eyes in front, the entire pectal region of the thorax, and the posterior 
margin of the third, fifth, and remaining ventral segments, which are lemon 
yellow. 
The under side of the cox, trochanters, and femora, including the apex of 
the latter above, are lemon yellow; the tibize and tarsi are as in the case of 
the 9. 
In some specimens the femora are entirely yellow or with a narrow black 
line on the anterior pair above, and the yellow band on the third ventral seg- 
ment is occasionally obsolete. 
Length, S-9 mm. 
xp. al., 15-17 mm. 
Habitat: Santa Clara County and Santa Cruz Mountains, California, Nevada, 
and Montana. 
Described from 24 females and 14 males, of which 25 specimens from Cali- 
fornia were bred by Mr. Koebele, and 15 from Nevada and Montana were 
collected. 
@ Insect Life, Vol. IV, pp. 177-178, 1891. 
Kein br] 
