52 Bulletin No. 159 



edge of head at sides, and sutures on side of thorax at bases 

 of the legs, black. Body with scattered erect hairs. No 

 branched respiratory appendages. False legs at posterior 

 end of body somewhat tapering, with a claw and a couple of 

 long hairs. Fleshy terminal protrusible appendages are 

 apparent in some examples, dorsal to the false legs on the 

 last somite. One example, Cumberland River, September 1, 

 another October 22; a half dozen examples. Left Fork of 

 Straight Creek, October 21, 1911. The unprotected, soft 

 condition of the body indicates a larva inhabiting a close 

 shelter, or case of some sort. The head, with its strong 

 sharp jaws denotes carnivorous habits. It is probably a 

 member of the genus Polycentropus. 



Case-fly Larva No. 7.— One small larva differing from 

 all of the above case-fly young was taken from the Cumber- 

 land River, August 81. It is yellowish, a trifle dusky on the 

 terga of the abdominal segments, with scattered erect hairs 

 on head and thorax, becoming more numerous but of the 

 same character on the abdomen. Head large relatively, 

 elongate and oddly flattened from the mouth backward, the 

 area produced sloping gradually upward to the occiput and 

 with a definite margin at each side, passing just over the 

 small eye. Head and thoracic plates yellow. Jointed legs 

 pallid. Branched ventral appendages white. Two divergent 

 posterior false legs with strong curved claws, and about six 

 long straight hairs. This species resembles No. 5, but its 

 flattened head and lack of pubescence distinguishes it. 

 Probably a Hydropsyche. 



Case-fly No. 8. —A rather large cylindrical case was col- 

 lected by me in Clear Creek near Pineville, June 16, 1892, 

 and appears to be different from Nos. 1 and 2. It is 

 pretty even in diameter from end to end, measuring 

 6 mm. in diameter and 24 mm. in length. It is occupied 

 by a larva with a short reddish-brown head. The hooks at 

 the hind end of its body still retain it in its case so securely 

 that to examine it would involve breaking the case or 

 injuring the insect. The whole case is covered with bits of 

 gravel, and one end is closed with a rather large white frag- 



