57° 



NEW YORK STATE MUSEUM 



The adult insect is a little over inch in length, black with a rusty 



yellow abdomen. 



Bibliography 



1895 Dyar, H. G. Am. Ent. Soc. Trans. 22 : 306 



1896 Marlatt, C. L. U. S. Dep't Agric. Div. Ent. Tech. Ser. 3, p. 59 



Pteronus vertebratus Say 



A greenish, solitary edge-feeding sawfly on poplar belongs to this species. 



This sawfly larva was taken by Dr Dyar on poplar at Plattsburg N. Y. 



and its egg and early stages have been described by him as follows : 



Egg. Laid in semicircular incisions under the upper epidermis, 1.5 

 mm long. 



Second stage. Head testaceous, a brownish shade up from the black 

 eye; width .65 mm. Body pale yellowish, the food showing green by 

 transparency, slightly shining, subannulate. 



Third stage. Head as in the next stage, but pale testaceous ; jaws 

 black, width 1 mm. Body the same, slightly shining, subannulate. 



Fourth stage. Head greenish, with a slight honey tinge, large, higher 

 than the dorsum ; a faint blackish shade runs up not far from the black 

 ocellus which is surrounded by a black spot ; mouth brown, a dark mark 

 for antennae; width 1.4 mm. Body subtranslucent, poplar leaf-green, not 

 shining, the segments folded; no annulets or the merest trace. Feet on 

 joints 6-1 1, 13; anal prongs short, brownish; blackish marks at the base 

 of the clear thoracic feet ; tracheal line evident, no tubercles. 



Fifth stage. The same with the same width of head. 



The adult female is about inch in length, light yellow marked with 

 black or darker brown. The male is a little smaller, black, marked with 

 yellow, and with the entire venter of the same color. 



Bibliography 



1895 Dyar, H. G. Am. Ent. Soc. Trans. 22 : 303 



1896 Marlatt, C. L. U S. Dep't Agric. Div. Ent. Tech. Ser. 3, p. 68-69 



Hylotoma pectoralis Leach 



Yellowish, black-spotted, sawfly larvae about Y inch in length, with reddish yellow 

 heads, feed during August and early September on birches. 



This insect is rarely brought to the attention of economic entomolo- 

 gists, though several reports of its occurring in immense numbers on 



