AQUATIC INSECTS IX NEW YORK STATE 287 



hooks. A yentral 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 excejjt the eighth, each with a double 

 circlet of hooks at its tip. On segment 1 each prolog is sim- 

 ple, with hooks directed posteriorly. On segments 2-7 each 

 prolog is divided at its apex, becoming double, with the hooks 

 on its two divisions opposed in position [pi. 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 l-J 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 (3) 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 111. It is H a 1 O'S u s h o s t i s 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 Eurojiean species P h r y g a n e a g r a n d i s 

 and Phryganea striata, and this one may well have 

 belonged to our Phryganea cinerea Hagen. 



