8 PROCEEDINGS OF THE 



vii., 41, 1; Hartig, Blattw. u., Holzw. 259, 3; (1) Zaddach, Besclir. 

 neuer oder wenig, &c., Blattw., 29, f. 12 ; Thomson, Opus. Ent, 

 272,2; Hymen. Scand., 186, 2. Feuiisa fuliginosa, Healy, Ent., 

 iii., 225. 



Black, shining ; knees, tibiae, and tarsi pale testaceous. 

 Antennae short, slightly thickened towards the apex. 



Male similar, but with thicker antennae, sometimes a little paler 

 underneath, with the posterior tibiae suffused with black. 



Length 1 J lines. 



Smaller than the preceding; the head scarcely so pilose; the 

 wings of a lighter tint ; posterior tibiae rarely black ; tarsi paler ; 

 antennae shorter, thickened towards the apex ; the 3d joint not 

 more than double the length of the 4:th; the joints rather more 

 globose, not so sharply cut off from one another; and the frontal 

 sutures scarcely so deep. 



Common in birch woods in May and June, and again in the 

 autumn. 



The larva, when young, has the body white, with a greenish 

 tinge on the back, caused by the contents of the food canal shining 

 through; the head pale brown. On the ventral surface of the 

 2d segment is a black dumb-bell shaped mark, and in the centre 

 of the 3d and 4th is a round black dot. The feet are encircled 

 with brown ; the abdominal feet white. Before the third moult 

 the head is darker coloured ; on the dorsal surface of the 2d 

 segment is an oblong black mark, usually divided in two by a 

 pale band in the centre ; on the ventral surface of the 2d 

 segment is an irregular black plate, and on the 3d, 4th, 5th, and 

 6th there is in the centre a black dot, these dots being, however, 

 frequently absent from the two last-mentioned segments. At the 

 last moLdt the body loses the markings, and becomes of a yellowish- 

 white colour, with a pale-brown head. 



Length about 5 lines. 



It mines the leaves of the birch, preferring, as IVIr Healy has 

 remarked, a variety with woolly leaves. There are usually from 

 four to eight or ten in a single leaf, each mine being at first separate, 

 but in course of time becoming united. There are two broods; 

 the first in June and July, the second in August and the other 

 autumn months. The pupa state is passed in the earth without 

 the protection of a cocoon. 



The pupa is white. 



