of certain species of Willow. — Part 2nd. 201 



white: its sheathe black. Legs greenish-white, the hind legs Bometimes pale 

 honey-yellow. Tarsal tips, especially in the hind legs, and the extreme tips of 

 the hind tibia-, obfuscated. Wings hyaline; veins black; costa and Btigma pale 

 dusky, the costa and the basal J of the stigma sometimes dull greenish-white. 

 Third submarginal cell longer than wide. Length 9 -22 — .26 inch; front wing 

 9.24— .27 inch. 



% Differs from 9 only as follows: — 1st. The black spot on the ocelli is much 

 er, attaining the antennas, and only separated from the eyes by a capillary 

 orbit. 2nd. The disk of the occiput is black, leaving a pretty wide, pale orbit. 

 Zrd. The antennse are 3 (not full i) as long as the body, joints fi — 9 (not fl — 8) 

 slowly shorter and shorter. Ath. The meso- and metanotum, tegulse and cenchri 

 excepted, are entirely black. 5th. The dorsum of the abdomen (basal membrane 

 excepted) is entirely black, and the lateral plates are basally black but termi- 

 nally clouded with honey-yellow. (\th. The legs are greenish-white, the hind 

 legs pale honey-yellow, and the whole of the hind tarsi dusky. 7th. The costa 

 and stigma are black. Length % .20 inch; front wing ^ .21 inch. 



One £ , three 9 ) bred April 17 — IS from the Cecidomyidous gall 

 S. rhodoides Walsh. Very like the pale variety of the gall-making 

 iV. s. desmodiodes n. sp., but the ground-color is yellowish not green- 

 ish, the antennae 9 are proportionally perhaps a trifle longer, and the 

 average size is \ — \ larger. Might be taken for ventralis Say, but that 

 species has no triangular pale spot on the pleura, and the joints of the 

 abdominal dorsum % are described as being banded with yellow. Its 

 size is also larger, viz. % .25 9 .80 inch. From several other described 

 species it differs as does S. pomum n. sp., and from S. pomum n. sp. 

 by the large triangular pale spot on the pleura $ 9 which it has in 

 common with S. desmodioides 9 • 



Nematus hospes, n. sp. — % 9 Absolutely undistinguishable from the normal 

 type of the gall-making N. a. pomum % 9 • except that in % the lateral plates 

 of the abdomen are blacker, and as in some % 8. pomum the dorsal joint 1 in % 

 is lightly tipped with yellow. Length % .17 inch: 9-13 — .19 inch; front wing 

 % .18 inch , 9 .20— .22 inch. 



One % , two 9 . bred from the Cecidomyidous gall S. strobtloides 0. 



S. April 7 — 8. On Feb. 20 I noticed a 20-footed larva burrowing in 

 this gall, which probably belonged to hospes, or perhaps to Euuraper- 

 turbans n. sp. which was also bred from that gall. It was about .20 inch 

 long, of a greenish cinereous color, the head darker, with the usual eye- 

 spots and the mandibles blackish; the legs porrect backwards and ap- 

 parently impotent. 



Nematus mendicus, n. sp. — 9 Y&le grass-green. Head rufous around the ocel- 

 li, .-oil let ii ik's tinged with rufous throughout. Eyes, i Hi, a dot behind the ocelli 



and generally another at each end of a transverse carina half way between the 

 anterior ocellus and the antennse, and sometimes a dot outside each antenna. 

 and always the tips of the mandibles, all black. Clypeus emarginate in a cir- 

 cular arc of <io° — 120°. Antennae slender, as hmg as the body, joints 3—5 sub- 

 equal, I Bometimes a trifle longer than either, .". sometimes a trifle shorter than 



PROCEEDINGS ENT. S0C. PHILAD. DECEMBER 1S66. 



