Mar. igoo.] DyAR : On THE LaRV.« OF SaW-FlIES. 2!» 



they had defoh'ated. Usually only a few on a bush, sitting flat on the 

 venter on the under side of the leaf. The cocoon is spun between 

 leaves. No ultimate stage. 



Larva referred to as "N," Can. Ent., XXVII, 340. 



FHeronus ostryae Marlatt. 



What I consider to be this species occurred to me on Carpiiius 

 Virginiana in Maryland, but it was not bred. The name has probably 

 been given after the wrong tree. 



Stage I. — Eating a hole in the middle of the leaf, the body curled 

 in S-shape. Head smoky testaceous, a dark lateral shade, eye black, 

 shining; width .4 mm. Body translucent whitish, finely annulate, 

 shining, food green ; anal segment swollen ; feet on joints 6 to 1 1 and 

 13, not used. 



Stage II. — Head whitish, slightly testaceous, eye black with a 

 shade behind ; width .7 mm. Body colorless, the food green, finelv 

 annulate; joint 13 enlarged; feet on joints 6 to 11 small ; antenna a 

 rudimentary point. 



Stage III. — Head rounded, greenish, shining, a black shade on 

 each side and an elongate one on the vertex ; width i mm. Body 

 translucent green, the segments about 6 annulate ; thoracic feet clear 

 with black marks at the bases ; abdominal feet short ; joint 13 swollen, 

 with a pair of thick, swollen-tipped clear anal prongs. Neither tra- 

 cheal line nor dorsal vessel contrasted. 



Stage IV. — Head pale brownish green, a black shade behind the 

 ocellus and a linear one on the vertex posteriorly ; with 1.3 mm. Seg- 

 ments rather obscurely 6-annulate, translucent green, dorsal vessel not 

 showing at all, tracheal line fine. Feet on joints 6 to 11 distinct, small, 

 joints 12-13 a little enlarged, the bulbous prongs brown at tip. Thor- 

 acic feet clear, testaceous at base. 



Stage V. has been briefly described Journ. N. Y. Ext. Soc. V, 26. 



Harpiphorus tarsatus Say. 



A local form of this species occurs on Long Island, N. Y., in which 

 the larvae differ from the form that I have previously described in pos- 

 sessing the white pruinose coating. This is, doubtless, the true tar- 

 satus, as the flies have the hinder tibiae entirely black as described and 

 not more or less pale on the basal portion as in those bred from the 

 non-pruinose larva. 



