of certain species of Willow. — Part 2nd. 2">1 



stigma fuscous, dull luteous basally and behind. Length 9 -12 inch; front wing 

 9 .13 inch. 



% Differs from 9 only a? follows : — l-s£. The spot enclosing the ocelli is larger 

 and separated from the eyes only by a very narrow orbit ; and the occiput is 

 distinctly black, except the orbits. 2nd. The flagellum is dull rufous above on 

 the terminal k and entirely bright rufo-luteous below. 3rd. The antennas are 

 jf (not 3-5ths) as long as the body. &th. The entire tip of the venter is luteous, the 

 lateral plates not concealing its tip in this sex. Length % .12 inch, front wing 

 % .13 inch. 



One % , one 9 . The % came out May 5, the 9 May 20. Differs 

 from Euura orbitalis Nort. (the only described N. A. species) by the 

 antennae not having in both sexes, alike "the apical half pale beneath,'' 

 and by the venter not being black immaculate. That species is describ- 

 ed as having "a pale luteous spot on the 1st segment of the abdomen," 

 but this probably refers to the basal membrane. Orbitalis is said to 

 have been taken on "the willow," the particular species not being men- 

 tioned. 



2fo. 17. Gall s. ovum. n. sp. — On Salix cordata. An oval or roundish sessile 

 monothalamous swelling, .30 — .50 inch long, placed lengthways on the side of 

 small twigs, green wherever it is smooth, but mostly covered with shallow lon- 

 gitudinal cracks and irregular rough scales which are pale opaque brown. Its 

 internal substance fleshy in the summer like that of an apple, but with trans- 

 verse internal fibres. When ripe in the autumn, filled with reddish-brown 

 spongy matter, with close-set transverse internal fissures at right angles to the 

 axis of the twig. On cutting down to the twig at any time, a longitudinal slit 

 about -20 inch long becomes plainly visible. Particular twigs on badly infested 

 bushes sometimes have one of these galls about on every half inch of their 

 length, and not placed in a regular row, but indiscriminately on any side of the 

 twig. Abundant but local. Described from very numerous specimens. 



Larva. By August 30 many larvse are already .10 — .12 inch long, and are then 

 imbedded in the slit at the base of the gall ; but in many other galls the larvse 

 are apparently not yet hatched. At this date the larva is pale-yellowish, with 

 a very pale fuscous head and the usual dark eye-spots. Tips of the mandibles 

 blackish. When removed from the. gall it uses its legs freely. On Oct. 2, many 

 larva? were still in the gall, and many remain there all winter, and finish their 

 transformations without going underground. From other galls the larvse had 

 bored their way out, and no doubt gone underground, leaving their excrement 

 behind them in the excavated gall. On Feb. 20, a larva (1 specimen) was .22 

 inch long, very pale dull greenish cinereous, the head darker, with a large, 

 blackish, round spot on the face, ami the usual eye-spots. Mandibles blackish. 

 Legs long, but porrect backwards and apparently functionally impotent. Pro- 

 legs 14, tuberculiform and very short and fiat. Most probably, however, this 

 larva must have been that of some unknown inquilinous species. A similar 

 larva, probably that of the inquilinous Nem. hospes, n. sp., was found repeatedly 

 in the spring in the Cecidomyidous gall S. strobiloides C. S., from which gall I 

 subsequently hied 1 ^ , 2 9 of If. hospes, and also a single % of the inquilinous 

 Euura perturbans, n. sp. A few galls, as late as March 6, were still solid and un- 



