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., vi, p. 261. 
1867. Xematus salicis pomum Norton. Trans. Amer. Ent. Soc, i, p. 216. (Cat., 
etc., p. 78.) 
1867. Xematus hospes Norton. Trans. Amer. Ent. Soc, I, p. 218. (Cat., etc., p. 80.) 
1869. Xematus salicis jfomum Walsh and Riley. Am. Ent., n, p. 45. 
1877. Xematus salicis pomum Riley. 9th Rept. Ins. Mo., p. 20. 
1881. Xematus salicis 2>omum Thomas. 10th Ent. Rept. 111., p. 68. 
1882. Xematus salicis jmmum Provancher. Nat. Can., xin, p. 292. 
1883. Xematus salicis pomum Provancher. Nat. Can. Hyni., p. 711. 
1895. Pontania hospes Marlatt. Proc Ent. Soc Wash., in, p. 266. 
Female. — Length 5 to 5.5 mm.; 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; 
antenna' 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; antennae, quadrate spot inclosing ocelli, with branches 
running to base of antennae, stripe on center of mesonotum extending 
to mesoscutelluin, 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; antenna' 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 interrivpted or occasionally almost wanting. 
Male. — Length 4 mm.; more slender and elongate than female; struc- 
turally as in female, except that the antenna' are longer; joints 3 to 5 
subequal. Color brownish black, shining; head and thorax opaque from 
rather coarse puncturing; face below base of antenna', orbits, angles 
of pronotum, teguhe, legs except bases of coxa?, and abdomen beneath 
yellowish ferruginous: tips of anterior tarsi and all posterior tarsi 
fuscous; antenme rufous beneath, especially toward tips; wings as in 
female, but slightly darker. 
Call. — (Frontispiece, fig. 4.) The gall ,9. pomum found on Salix cordataand very rarely 
on 8. discolor. A smooth, lleshy, 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 ou various willows by Xematus (jallicola 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., VI, p. 255. 
