36 
17. Pontania pomum Walsh. 
1866. Nematus salicis pomum Walsh. Proc. Ent. Soc. Phil., vi, p. 255. 
1866. Nematus hospes Walsh. Proc. Ent. Soc. Phil., v1, p. 261. 
1867. Nematus salicis pomum Norton. Trans. Amer, Ent. Soc., I, p. 216. (Cat., 
etc., p. 78.) 
1867. Nematus hospes Norton. Trans. Amer. Ent. Soc.,1, p.218. (Cat., etc., p. 80.) 
1869. Nematus salicis pomum Walsh and Riley. Am. Ent., u, p. 45. 
1877. Nematus salicis pomum Riley. 9th Rept. Ins. Mo., p. 20. 
1881. Nematus salicis pomum Thomas. 10th Ent. Rept. Ill., p. 68. 
1882. Nematus salicis pomum Provancher. Nat. Can., x11, p. 292. 
1883. Nematus salicis pomum Provancher. Nat. Can. Hym., p. 741. 
1895. Pontania hospes Marlatt. Proc. Ent. Soc. Wash., 111, p. 266. 
Female.—Length 5 to 5.5 nim.; very robust, shining; clypeus rather 
deeply, but angularly emarginate, lobes triangular, rounded; ridges of 
vertex about ocellar basin rounded, subobsolete; frontal crest broad, 
rounded, slightly notched; antennal fovea very shallow, elongate; 
antenne short, not longer than head and thorax, joint 3 a little longer 
than 4 or 5; sheath very broad and robust, scarcely tapering, rounded 
at tip; cerci rather long, tapering; claws not very deeply cleft, inner 
ray much shorter than outer; venation normal, except that outer veins 
of the discal cells of hind wings are usually interstitial. Color yellow- 
ish ferruginous; antenne, quadrate spot inclosing ocelli, with branches 
running to base of antenn, stripe on center of mesonotum extending 
to mesoscutellum, spot on either side of scutellum and thorax posterior 
to same, with basal plates and narrow basal margin of the dorsal seg- 
ments becoming indistinct toward tip of abdomen, and sheath brownish 
black; antenne indistinctly rufous beneath toward tips; posterior tarsi 
slightly infuscated at tips; veins brown; stigma and costa more inclined 
to yellowish, former not especially lighter at base; black stripe on 
mesonotum is sometimes interrupted or occasionally almost wanting. 
Male.—Length 4 mm.; moreslender and elongate than female; struc- 
turally as in female, except that the antenne are longer; joints 3 to 5 
subequal. Color brownish black, shining; head and thorax opaque from 
rather coarse puncturing; face below base of antenne, orbits, angles 
of pronotun, tegule, legs except bases of cox, and abdomen beneath 
yellowish ferruginous; tips of anterior tarsi and all posterior tarsi 
fuscous; antenn rufous beneath, especially toward tips; wings as in 
female, but slightly darker. 
Gall.—(Frontispiece, fig.4.) The galls. pomum foundon Salix cordata and very rarely 
on 8S. discolor. A smooth, fleshy, sessile, globular, or slightly oval monothalamous 
gall, like a miniature apple, 0.30 to 0.55 inch diameter, growing on one side of the 
midrib of a leaf, and extending to its edge or beyond it. The principal part of the 
gall projects from the under side of the leaf; very rarely it is bisected by the leaf. 
Color greenish yellow, sometimes with a rosy cheek, especially the upper surface, 
and often with little dots. Fully mature July 31. An analogous gall is formed in 
Europe on various willows by Nematus gallicola Westw. 
Larva.—May 24 it is only about 0.10 inch long; June 11 it is white, 0.10 to 0.13 
inch long; July 24, 0.15 inch long; July 30, 0.15 to 0.20 inch long, pale greenish 
white, head pale brown. Legs freely movable. There was no earth in the jar in 
which the galls were placed, and most of the cocoons were spun in the galls and a 
few between them.—Walsh, Proc, Ent. Soc. Phila., v1, p. 255. 
