34 
14. Pontania pisum Walsh (fig. 7.) 
I860. Xematus salicis pisum Walsh. Proc. Ent. Soc. Phila., vi, p. 259. 
1866. Nematus quercicola (Walsh) Cresson. Proc. Ent. Soc. Phila., VI, p. 260. 
1867. Xematus salicis pisum Norton. Trans. Amer. Ent. Soc, I, p. 204. (Cat., etc., 
p. 66.) 
1880. Xematus salicis pisum Thomas. 10th Rep. State Ent. 111., p. 68. 
1895. Xematus pisum Marlatt. Proc. Ent. Soc. Wash., in, p. 264. 
1895. Xematus quercicola (Walsh) Marlatt. Proc. Ent. Soc. Wash., m, p. 266. 
Female. — Length 4 mm.; slender, head wider than thorax; abdomen 
spindle shaped; elypens rather deeply and angularly notched, lobes 
triangular; ocellar basin distinctly limited, lateral ridges not very 
sharply raised; frontal crest prominent, slightly notched at center; 
antenna! fovea shallow, elongate; antennae 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: Antennae, 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 prouotum, tegulae, legs except extreme base of posterior coxae, 
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 tibiae and tarsi infuscated; antennae 
very slightly paler beneath and toward tips; veins and stigma brown; 
costa lighter at base. 
Male. — Length 3.5 mm.; very slender and graceful; antennae longer 
than in female and more robust; joints 3 to 5 subequal. Color black; 
face below frontal crest, orbits, angles of prouotum, tegulae, legs except 
bases of posterior cox;e, central portion of abdomen beneath, and hypo- 
pygium yellow; veins as in female; antennae fulvous beneath and also 
entirely ;it apex. 
"Gall. — The gall made by it is found on Salix discolor. A suhspherical, 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 tho inidrih), 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 hut one gall 
to the leaf, hut 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, w hich in the larger ones have burst into a scabrous blown scar. Only 
in three out of sixty-two was there any rosy cheek, as in 8. pomum. The point of 
attachment is marked on the upper side of the leaf by a brown subhemispherical 
depression. 
"Larva. — 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 two of the others and apparently 
divided in two by a 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, larvae 
which had perished when immature were found." — Walsh, Proc. Ent. Soc. Phila., VI, 
p. 259. 
