Wings.—Fibres of medium grizzled blue Cock’s hackle.

Body.—Red silk, No. 12, dubbed with maroon wool and ribbed with four turns of fine gold wire or tinsel.

Tail.—Two strands from a deep red Cock’s hackle.

Legs.—Deep red Cock’s hackle.

Head.—Red silk.

July, August and September.

No. 27.

July Dun.

Ephemeridæ.

Hook 1.