108 ON CREEPERS. 



its fixed dwelling, and rises to the surface of the water, 

 where the creeper skin is split open at the shoulders, like 

 the browns and drakes, and the fly takes wing, or paddles 

 to land. Many take their first rest under loose stones by 

 the water's edge, where they may be found ; but after tak- 

 ing wing find other places of repose. In this way all the 

 dun tribes of flies, from the least freckled to the red, pro- 

 gress to perfection, from the egg to the fly in the water. 

 The soft empty creeper skins (scarce the thickness of a 

 minnow's bladder) float away on the top. The empty 

 artificial cases remain in their original places until washed 

 away. 



TTH. RED DUN CREEPER. Length, five-eighths to three 

 quarters. Head, shoulders, and legs, black or dark brown ; 

 body, a dark dirty shade of yellow or amber. Length of 

 case better than an inch, covered over with small short 

 pieces and chubby knobs of bits of sticks, of a black appear- 

 ance, which probably imparts a dark shade to the fly. Is 

 the largest creeper and fly of the dun clasp. They are found 

 under stones in shallow streamy runs, but are not so 

 numerous or good to find as the cod and stickbait. The 

 drawing represents the case and fly of 30th August. 



STH. LIGHT DUN CREEPER (codbait). Length, half an 

 inch ; head, legs, and shoulders, black ; body yellow. Is 

 the lightest colored creeper, and produces the lightest dun 

 flies ; their stony covering imparts no dye. Length of case 

 three quarters to an inch, cylindrical, and rather bowed ; 

 is studded rough on the outside with particles of sand, 

 which presents a piece of tesselated work which would puzzle 

 a Roman. They lie under stones in shallow currents that 

 run over sand and gravel, which their rough-cast coats 

 exactly resemble, and keeps them safe at anchor. Several 

 may oft be found under the same stone. They are good 



