CADDIS-FLIES 281 



Hydropsyche pellucida. A large yellow-grey sedge 

 fairly common on the Test, and appearing usually on 

 sunny days. 



Hydropsyche guttata. A smaller fly than the above, 

 very variable in its markings, and appearing in clouds 

 on hot days throughout the summer, apparently pre- 

 ferring sunny places. 



Hydropsyche instabilis. A very handsome medium- 

 sized sedge with strong markings on the wings. Female 

 insects are more abundantly captured than the males. 

 Philopotamos. Spurs 2, 4, 4. 



Philopotamos montanus. A very beautiful insect, 

 slightly resembling Phryganea varia in the markings 

 of its wings, which are mottled with varying shades of 

 brown. It may be identified by two lobster-claw-like 

 appendages at the extremity of the abdomen of the 

 male. 

 Polycentropus. Spurs 3, 4, 4. 



Polycentropus Jlavo-maculatus. nroKv, many, Kevrpov, 

 spur, referring to the number of spurs ; and Jlavo- 

 maculatjis, spotted with gold, referring to the mark- 

 ings on the wings. 



This insect is a small brown sedge found in nearly 

 all British rivers in considerable abundance. The 

 general markings of the wings are similar to some 

 of the species of Hydropsyche, but the fly is of much 

 smaller size. Like Hydropsyche it appears to have 

 no objection to the sunlight, and may often be seen 

 flying about from one resting-place to another along 

 the river-bank. 



