of certain species of Willow. — Part 2nd. 2G3 



Nematus fur, n. sp. — % Black. Bead opaque, very minutely and closely punc- 

 tato-rug<>se. Clypeus, labrum, the extreme tip of the cheek, and the base of the 

 mandibles, all dull greenish-white. Clypeus emafginate in a circular arc of 

 about 45°, with a small tubercle in the middle of its anterior margin. Labrum 

 full as long as wide, its tip rounded. Antennae black, 4-5ths as long as the body, 

 rather more compressed than is usual in £, joints 4 and 5 equal in length.: 1 , 

 shorter by J, 6 — 9 very slowly shorter and shorter. Thorax opaque, very mi- 

 nutely rugose, subpolished on the pectus; a pale subtriangular tubercle on the, 

 lateral margin of the black subpolished basal plate. Cenchri pale, but not ob- 

 viously so. Abdomen subpolished, bright fulvo-rufous, the basal edge of joint 1 

 next the basal membrane, which is whitish, clouded with black. Genitals ob- 

 fuscated. Legs black. Wings subhyaline, slightly tinged with fuliginous; 

 veins and stigma black. Length % .39 inch : front wing ^ .38 inch. 



One £ , bred March 29 from an old bored subpeduncled spherical 

 gall, .57 inch in diameter, made by Cecidomyia s. batatas Walsh on 

 S. huuiilis; 9 unknown. As the mother Saw-fly must have deposited 

 her egg in this gall after the gall-maker had quit it or not long before, 

 it is a question whether, if such be its general habits, this species can 

 be properly considered as an Inquiline. On Feb. 20, however, I found 

 in a recent gall of C. s. batatas a pale, greenish-white, Tenthredinidous 

 larva, which may appertain to fur, unless it was the larva of Euura 

 pertvrbans n. sp. which I bred from recent specimens of that gall. On 

 April 14 — 23 I took on the same willow on which the above gall grows 

 3 % , which scarcely differ from fur, except in having the abdomen 

 entirely black and the thorax subpolished, and also 299 apparently 

 belonging to these % % , which had a rufous abdomen. Whether these 

 o % 9 9 are varieties of fur or distinct species remains to be proved, 

 but I incline to think them distinct. Nematus luteotergus % Norton 

 has honey-yellow, not black legs, and besides it is only 2 the size of 

 fur. Nematus erythrogaster 9 Nort. also has legs varied with white 

 and rufous, and is only about | the size of fur. I know no other de- 

 scribed species that approaches it. 



Genus PRISTIPHORA.— Inquiline or Guest- fly. 

 Pristiphora sycophanta, n. sp. — % Black. Head polished, but sparsely and 

 rather coarsely punctate. Face with a lofty but obtuse carina extending from 

 between the antennae to the clypeal suture. Clypeus squarely truncate. La- 

 brum twice as wide as long. Mouth entirely black. Antennae nearly as long as 

 the body, black above, brown-black beneath, joints 3 — 5 subequal, (5 — 9 very 

 slowly shorter and shorter. Thorax polished with fine shallow punctures. Te- 

 gulas and cenchri dull yellowish. Abdomen polished with fine shallow punc- 

 tures, sparse towards the base, more dense towards the tip. Basal membrane 

 dull whitish. Legs whitish; coxae, except their extreme tips, femora, tarsal 

 tips, and in the hind legs the terminal i of the tibiae and the entire tarsi, all 

 black. Wings hyaline: veins black : costa and stigma dusky: first submargin- 

 al cross-vein obsolete in both wings, the antepenultimate cell receiving both 



