No. 13b.
Dark Watchet or Iron Blue Dun.
Ephemeridæ.
Hook 0 or 00.
Wings.—From the darkish blue feather from a Blue Tit’s tail, bunched and split.
Body.—Same as No. 13a.
Tail.—Two strands from a medium grizzled blue Cock’s hackle.
Legs.—Feather from a young Starling’s thigh or flank.
Head.—Orange silk.
Last week in April and throughout May, and sometimes early June. For brighter days.