34 
14, Pontania pisum Walsh (fig. 7.) 
1866. Nematus salicis pisum Walsh. Proc. Ent. Soc. Phila., v1, p. 259. 
1866. Nematus quercicola (Walsh) Cresson. Proc. Ent. Soc. Phila., v1, p. 260. 
1867. Nematus salicis pisum Norton. Trans. Amer. Ent. Soce.,1, p.204. (Cat., ete., 
p. 66.) 
1880. Nematus salicis pisum Thomas. 10th Rep. State Ent. IIL, p. 68. 
1895. Nematus pisum Marlatt. Proc. Ent. Soc. Wash., 1, p. 264. 
1895. Nematus quercicola (Walsh) Marlatt. Proc. Ent. Soc. Wash., II, p. 266. 
Female.—Length 4 mm.; slender, head wider than thorax; abdomen 
spindle shaped; clypeus rather deeply and angularly notched, lobes 
triangular; ocellar basin distinctly limited, lateral ridges not very 
sharply raised; frontal crest prominent, slightly notched at center; 
antennal fovea shallow, elongate; antennze short, moderately robust, 
joints 3 to 5 subequal; sheath broad, very slightly emarginate beneath, 
rounded above, apex rounded; cerci rather long, tapering; claws 
deeply notched, rays subequal; third cubital cell quadrate; upper 
discal cell not exceeding lower. Color: Antennie, spot on vertex 
extending more or less over occiput, thorax, most of abdomen, includ- 
ing sheath, black; orbits and face below and including frontal crest, 
- most of pronotum, tegulie, legs except extreme base of posterior coxie, 
more or less of central portion of venter of abdomen, including all 
terminal segments and the terminal dorsal segment with.cerci, yellow- 
ish ferruginous; tips of posterior tibize and tarsi infuscated; antennie 
very slightly paler beneath and toward tips; veins and stigma brown; 
costa lighter at base. 
Male.—Lenegth 3.5 mm.; very slender and graceful; antennie longer 
than in female and more robust; joints 3 to 5 subequal. Color black; 
face below frontal crest, orbits, angles of pronotum, tegulie, legs except 
bases of posterior coxze, central portion of abdomen beneath, and hypo- 
pygium yellow; veins as in female; antennie fulvous beneath and also 
‘entirely at apex. 
‘““Gall.—The gall made by it is found on Salix discolor. A subspherical, pea-like, 
hollow, pale yellowish-green gall, always growing on the underside of the leaf and 
almost always from one of the side veins (in one case from the midrib), and attached 
to the leaf by only a minute portion of its surface; 0.18 to 0.28 inch in diameter, and 
a few, immature, only 0.08 inch in diameter. Almost invariably there is but one gall 
to the leaf, but on four leaves there were two, and occasionally two are confluent. 
Surface in some smooth and even, without pubescence; in others a little shriveled, 
generally studded in the medium-sized ones with four to twelve small, robustly con- 
ical nipples, which in the larger ones have burst into a scabrous brown scar. Only 
in three out of sixty-two was there any rosy cheek, as in s. pomum. The point of 
attachment is marked on the upper side of the leaf by a brown subhemispherical 
depression. 
“Tarva.—August 25. Apparently 18-footed, no anal prolegs being visible. When 
at rest, it elevated its entire abdomen behind the true legs in the air. Length 0.17 
to 0.23 inch; color whitish hyaline; head slightly dusky; mouth dusky; eye-spots 
circular and black; anal segment equal in length to twoof the others and apparently 
divided intwo bya transverse medial suture. The larva goes under ground to trans- 
form, for out of fifty galls all but three were bored, and in those, when opened, larvz 
which had perished when immature were found.”—Walsh, Proc. Ent. Soe. Phila., v1, 
p. 259. 
