June, 1898.] Dyar : New Species and Larvte of Sawflies. 
121 
ON THE LARV/E OF CERTAIN NEMATIN/E AND 
BLENNOCAMPINiE, WITH DESCRIPTION 
OF NEW SPECIES. 
By Harrison G. Dyar, Ph.D. 
Pontania borealis Marlatt. 
Galls on Salix sericea at Plattsburg, N. Y. ; solitary, smooth, ex¬ 
ceeding the edge of the leaf, reaching from the midrib to beyond the 
margin and at varying distance from the base; not evenly divided by 
the leaf about one-third above, two-thirds below; shape pyriform or 
rounded; a few corky dots; color greenish, strongly red shaded, espe¬ 
cially above; length, 8-9 mm., width about 6 mm., height, 5 mm.. 
The substance is thick, fleshy, white with pink lines. 
Larva. —Head .6 mm.; all white, eye and mouth black. 
Last Stage. —Head whitish, a dusky shade above the clypeus, eye 
black mouth, brown ; width 1.0 mm. Body all white, waxy, not shin¬ 
ing, segments obscurely 3-annulate, a little shaded with blackish in the 
folds. Thoracic feet rather large, colorless; abdominal ones on joints 
6 to 11, distinct, slender. Body uniform, subventral folds somewhat 
prominent, joint 13 tapering. Length, 6.5 mm. Single brooded; 
cocoons in decayed wood. 
Pontania consors Marlatt . 
Galls found with the preceding on N. sericea , but gregarious, hairy 
and spherical. Near the base of the leaf, three or two together, rarely 
but one, exceeding the margin often by half the diameter of the gall; 
not evenly divided by the leaf, about one-third or a little more above, 
two-thirds below; pale greenish, often heavily marked and mottled 
with red above, paler below, rarely uniformly pale. Strongly silky hairy 
like the leaves below, less hairy or even smooth above; size 8.5X8.5X 
7 mm. or as small as 5 mm. in diameter. The substance is fleshy, 
strongly streaked with pink. 
Larva. —Head .9 mm. ; all white, eye and mouth black, segments 
annulate, with large obscure concolorous tubercles; joint 13 tapering. 
Single brooded; cocoon in decayed wood. 
Pteronus carpini Marlatt. 
Gregarious on the iron wood,* Fort Lee, N. J., in September. 
Head shining black, 1.8 mm. wide, under the lens black dotted on a 
* I am not certain now whether this tree was the Ostrya virginica or Ccirpinus 
caroliniana. 
