LIFE-HISTORIES OF SAWFLIES. yi 
broadest at the middle of the abdomen; colours black and 
yellow or greenish yellow; the head, which is very broad, is 
greenish yellow, with a broad black transverse band along the 
forehead and encircling the eyes: this band is unequal and serrate 
above and below. The antenne are as long as the head is broad ; 
the first two joints are yellow with the upper border black—these 
are without teeth; the third joint is yellow at the base, and 
further black; all the remaining joints are black ; the third has a 
rather long tooth or pectination on the under side; the fourth has 
a somewhat longer tooth, but the following all gradually decrease 
in length towards the tip of the antenna. The mandibles are of 
a brown tint, the palpi yellow. The posterior border of the head, 
where it touches the thorax, is black. 
The prothorax is entirely pure yellow; the mesothorax has the 
anterior lobe black with a greenish yellow margin; the lateral 
lobes are black with an obtuse triangle of a yellow tint next to 
the insertion of the wings. The squamule and the scutellum 
are obscure yellow, with the posterior border black; the meta- 
thorax is entirely black. The mesopectus is yellow, with black 
sutures and a large pectoral spot. The wings are transparent 
sordid white, with yellow costa, the nervures being partly yellow 
and partly brown. 
The abdomen is essentially green-yellow; the posterior 
margins of the segments are, however, shining black, broadest 
toward the middle of the dorsum, so much so that the two 
anterior segments shew but little yellow at the sides, and only on 
the fifth does a narrow line of yellow extend across the whole 
dorsum, while the eighth segment is almost entirely of this colour. 
On the ventral surface the abdomen displays more yellow, and at 
the anus 1s a conspicuous marking of yellow with black spots. 
The legs are for the most part yellow, the bases of the coxe 
being black, and a line on the under side of the femora, a broad 
ring at the apex of the tibie, and the posterior margin of all the 
tarsal joints pale brown or grey. In the female as well as in the 
male the tarsal joints are much expanded on the inner side and 
are at the same time furnished with patelle, the inner spine on 
the posterior tibiz being, in the female, expanded so as to form 
a somewhat broad oval plate. 
The male is, as a rule, rather smaller, the coloration being 
black, slightly diversified with yellow; of this colour are the 
