June, is 9 s.] Dyar : New Species and Larvae of Sawflies. 121 



ON THE LARV/E OF CERTAIN NEMATIN^E AND 



BLENNOCAMPIN^E, 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 6". sericea, but gregarious, hairy 

 and spherical. Near the base of the leaf, three or two together, rarely 

 but ope, 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 CarJ>itius 

 caroliniana. 



