THE ENTOMOLOGIST. 
Vou. XVI.) FEBRUARY, 1883. [No. 287. 
CONTRIBUTIONS TO THE HISTORY OF THE 
BRITISH PTEROPHORLI. 
By Ricuarp Souru. 
(Continued from vol. xy., p. 149.) 
Acrprini1a, Hb. 
baliodactylus, Zell. 
tridactylus, Stph. 
(PxuatE I., Fie. 1.) 
Imaco.—Expanse, 10-13 lines. Fore wings whitish, sometimes with a 
pale brown or pale ochreous brown tinge ; the costa is narrowly edged with 
dark brown to beyond the middle, at which point is situated a small linear 
spot darker than the costal edging; beyond this, and nearer the tip of outer 
digit, is a grey-brown cloud of variable intensity. Fringes grey-brown. 
Tips of both digits pointed, that of the inner slightly deflexed.. Hind 
wings, fringes of the three feathers dark grey-brown, shafts paler. Head, 
thorax and legs same colouras fore wings. Abdomen witha yellowish tinge. 
July and August. 
Larva.—Length, 7 lines, tapering towards anal extremity. Head 
smaller than 2nd segment, yellowish green; a small black spot on each 
cheek, and brown mandibles. Ground colour dingy green, segmental 
divisions and dorsal line yellowish green. ‘Tubercles, two dorsal rows (four 
on each side) whitish, with tufts of white hairs; subdorsal and spiracular 
rows, two warts on each segment, the anterior wart on each segment in 
both series is the largest, and one hair of the fascicle emitted therefrom is 
longer than the others. Prolegs and anal claspers transparent yellowish 
green. Food, marjoram (Origanum vulgare). Hats the terminal leaves ; 
generally to be found at rest in the daytime on a plant, the top of which the 
larva has caused to droop by biting into the stem. Feeds in the evening. 
June. 
D 
