Dec. 1897 ] 
Dyar : New Sawfltes, and Larvae. 
199 
Sta ge V .—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 joints 6 to n ; 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. 
Cocoon. —Oval, 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, Lono- 
Island. 
St rongyIogaster abnormis Provancher. 
Larvae found on knot weed (.Polygonum lapathifolinin') 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 
g ra y 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 larvae when occasionally sitting on the upper surface of 
the leaf may be somewhat sinuate. Anal segment green, concolorous 
with the rest. 
Strongylogaster pinguis Norton. 
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. 
jSoc., 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 
ilso 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, 
is I have seen the black form also on the oak. 
. 
