AQUATIC INSECTS IN NEW YORK STATE 381 
Larva. Specimens from Wilmuth and Axton N. Y. [PI1.37, 
fig.1 to 6]. Pale brown with paler incisures; head brown, lab- 
rum hairy, with serrated edge; fans with 50 to 60 rays; man- 
dibles with a pair of apical setae; hypopharynx as usual; labrum 
[fig.6] with middle tooth rather prominent, its ventral surface 
with five setae in each of the two rows; each of the three 
branches of anal papillae with a number of lobes. 
Pupa. Six branched respiratory filaments; eight hooks curved 
cephalad on dorsum of each of abdominal segments 3 and 4; 
four hooks curved cephalad on ventral surface of each of seg- 
ments 5, 6 and 7; a close transverse row of small caudad pro- 
jecting spines on dorsum of eighth segment, and a pair of short, 
blunt tubercles on the anal segment. Cocoon of the wall pocket 
type. 
S. venustum, var. a 
Plate 37, fig.8—14 
A number of specimens bred from larvae and pupae taken 
from Fall creek, Ithaca N. Y., differ in the adult stage from 
venustum as described above in being uniformly smaller 
(length 1.5mm); having the base of wing brownish and not yel- 
low, and in having the last four abdominal segments of the 
female a shining black instead of brown. The larva differs as 
follows: in size averaging less than two thirds that of venus- 
tum, labrum with its toothed edge wider in proportion to its 
size than in venustum, its teeth more nearly of a size, 
the ventral setae three in each row plus a very small one. The 
pupa differs in having 10 respiratory filaments in each tuft, 
the hooks on segment 2 more distinct, and the tubercles on the 
anal segments apparently wanting. 
S. piscicidium (Synonym of venustum) Riley 
Am. Ent. 2:367 
According to Coquillett this is a synonym of S. venustum; 
but I have larvae and pupae from Professor Needham, taken 
at Saranac Inn N. Y., which, though agreeing with Riley’s fig- 
ures of piscicidium, differ decidedly from the larvae and 
pupae of S. venustum taken by Messrs MacGillivray and 
Houghton at Axton N. Y. in 1901, and by Professor Comstock 
at Wilmuth N. Y. Of tke adults of the Saranac Inn material 
I have only alcoholic specimens, hence can not state definitely 
wherein these differ from S. venustum from Axton N., Y. 
excepting that it averages a little larger in size. For the pres- 
ent I shall regard it as a variety, though in all the material 
