AQUATIC INSECTS IN NEW YORK STATE 287 
hooks. A ventral pair of slender bristles under both meso- 
thorax and metathorax. 
There are stout ventral prolegs on abdominal segments 1-8, 
paired on all the segments except the eighth, each with a double 
circlet of hooks at its tip. On segment 1 each proleg is sim- 
ple, with hooks directed posteriorly. On segments 2-7 each 
proleg is divided at its apex, becoming double, with the hooks 
on its two divisions opposed in position [pl.10, fig.2]. On 
the eighth segment there is a single median proleg with its 
hooks directed forward, and at its base is a pair of low, broad 
anal tubercles. There are two pairs of conic, fleshy tubercles 
on each of segments 1-7 of the abdomen, one tubercle at either 
side of the dorsum and a longer one at the middle of each side, 
all increasing in length posteriorly. The abdomen ends on the 
dorsal side in a pair of long, fleshy processes, stout at base and 
attenuate to apex, each with a lateral fringe of long hairs each 
side, on the outer side the fringe extending on segment 8 nearly 
to its base. Between the bases of these processes on the dor- 
sum of the eighth segment is the single respiratory aperture— 
a narrow median slit guarded by white lips, on a low convex 
elevation. 
The most remarkable features of this larva are (1) the con- 
formation of the caudal end of the abdomen, (2) the single res- 
piratory aperture and (8) the paired and bifurcated prolegs with 
their heavy armature of grappling hooks. This grappling appa- 
ratus is doubtless correlated with a life spent clinging to the 
surfaces of rocks in the current of rushing streams. 
A note on caddis flies described in Bulletin 47 
The identity of the species described on p.569-70 as “3 Halesus 
sp.?” has been settled by the rearing of it by Mr Betten at 
Lake Forest Ill. It is Halesus hostis Hagen. Larvae, 
in cases like the one shown in plate 33, figure 1 of Bulletin 
47, were collected from a spring-fed rivulet late in August. 
Pupae were found in the breeding cage soon thereafter, and a fine 
male imago emerged on Sep. 23. 
Two excellent German students of the Trichoptera, Ulmer and 
Weltner, simultaneously and very kindly sent information as to 
the probable identity of the “ egg-ring of an unknown caddis fly ” 
figured on plate 33 of Bulletin 47. Similar egg masses are laid, 
they say, by the European species Phryganea grandis 
and Phryganea striata, and this one may well have 
belonged toour Phryganea cinerea Hagen. 
