Dec. 1897] Dvar: New Sawflies, and Larv^. 199 



Stage K— Head leaden blackish, sutures of clypeus broadly pale, 

 eye black; width .95 mm. Body yellowish green, darker from the 

 shade of the alimentary canal, ill-defined wrinkly 3-annulate, minutely 

 setiferous, no distinct tubercles. Anal end bluntly rounded, brown 

 dotted above. Feet moderate, on jomts 6 to 11 ; tracheal line evident. 



At maturity the larva eats a hole in the gall, through which it 

 pushes out the frass for some time before it is ready to leave the gall. 

 Sometimes more than one hole is eaten or even an adjoining part of the 



leaf. 



Cocoo7i.—Ov3\, brown, dense and opaque, sometimes formed be- 

 tween leaves on the tree or in a deserted gall. 



Found on a large smooth-leaved willow tree at Bellport, Long 

 Island. 

 Strongylogaster abnormis Provancher. X 



Larvje found on knot weed {^Polygonum lapathifoliuni) in New York 

 City differed from those which I have previously recorded on Rumex 

 (Trans. Am. Ent. Soc. XXII, 311), as follows : Head whitish with a 

 light gray patch before the apex of each lobe ; a brown patch in clypeus ; 

 a very slight bloom. Subventral folds slightly angulated and with the 

 white points suggesting somewhat the appearance of S. pinguis, espe- 

 cially as the larv£e when occasionally sitting on the upper surface of 

 the leaf may be somewhat sinuate. Anal segment green, concolorous 

 with the rest. 

 Strongylogaster pinguis Norton. 



^o-cr —Under the upper epidermis in an irregularly elliptical area 

 1.7 X 1.4 mm., transparent, overlaid by the reticulations of the epider- 

 mal cells. Before hatching the larva swells up somewhat and a ring of 

 air forms around it, appearing like a white margin. 



The newly hatched larva has a width of head of about .3 mm., con- 

 firming my former observations, which I had doubted (Trans. Am. Ent. 

 Soc, XXII, 308) and showing that there are probably seven stages in- 

 stead of six. My descriptions, then, refer to stages I, II, IV-VII. 



Found on black oak at Bellport, Long Island. 

 Acordulecera dorsalis Say. 



The larvae recorded in Can. Ent. XXVII, 340 as '' 6U " on hick- 

 ory, proved to be not different from this species when raised to maturity. 

 A number were found at Fort Lee, N. J., on pig nut hickory. I have 

 also seen others in which the head was partly black and partly pale. 

 The food plant was not the cause of the difference in color of the heads, 

 as I have seen the black form also on the oak. 



