212 EUURA NIGRITARSIS. 



3. EUURA NIGRITARSIS, sp. nov. 

 PL VIII, fig. 12, Lar., 12a, Galls. 



Black ; the labrum, the mandibles (except at tlie apex, which is 

 brownish), sometimes the apex of clypeus, the apex of COXEG, base and 

 apex of femora broadly (especially the anterior) and tarsi, yellowish- 

 white ; apex of hind tibiae and tarsi black. Wings hyaline, stigma 

 fuscous or black, the base white. Apex of antennae brownish 

 beneath. 



The <$ has the flagellum compressed, brownish beneath, closely 

 pilose, and the legs bear more black ; the lower inner orbits are whitish, 

 and the white at base of stigma is scarcely visible. 



Length 3 3| lines. 



Ab. a. Mouth black. 



b. Tegulae white. 



c. Cerci fuscous or brownish. 



d. Outer orbits brownish. 



e. Clypeus white at apex. 



It is a smaller species than E. angusta, and may be 

 known from it by its more broadly incised clypeus, 

 and shorter and broader abdomen, which is always 

 black at the apex. E. Iceta, Zad., comes very near to 

 it, but is, I believe, a distinct species, it having the 

 last abdominal segment brownish, the cerci pale, the 

 tegulse yellow, the margin of the collar being also of 

 this colour. Lceta also differs somewhat in habits, it 

 forming its galls in the leaf -bud and in the leaf -stalk 

 issuing from it. 



The larva of the present species lives in the leaf- 

 buds of Salix caprea. These become thereby swollen 

 and a little distorted. Internally they become con- 

 verted into a green granular matter on which the 

 larva feeds. The greater part of the inside is devoured, 

 and when the larva leaves it the greater part of one 

 side is eaten or at least destroyed to enable the larva 

 to leave the bud. A thin layer of the green substance 

 is left next to the outer scale. Some of the larvas 

 creep into suitably sized twigs, boring their way into 



