491 



green colour, with a darker line down the middle of the back, margined on 

 both sides with a series of whitish marks". It feeds on the broom, elm, horn- 

 beam, birch, and oak. It is found in September, and again in May, living 

 through the winter. 



Meteocampa perlaria Guene'e. Plate 12, fig. 1. 



Metrocampa pcrtata Guen., Pbal., i, 128, 1857. 



Walk., List Lep. Het. Br. Mus., xx, 157, 1860. 

 Metrocampa virido-perlata Pack., Proc. Bost. Soe. Nat. Hist., xvi, :!8, 1874. 



5 3 and 7 9 . — Pearly-white, with a decided greenish tinge. Body, 

 antennae, and feet snow-white. Front white; a transverse reddish line just 

 below the antennae, but never extending below on to the front. Fore wings 

 crossed by two broad, diffuse, white lines, bordered widely within with pale 

 brown, which fades into the ground-color of the wing ; both lines are straight- 

 Fringe white. Beneath white; the lines not reproduced beneath. 



It is, contrary to GueneVs statement, as large as the European marga- 

 ritacea, but may perhaps often be smaller ; but the angle of the hind wings 

 is no more marked than in the European, but, as he says, the outer line 

 terminates nearer the apex, and this is the best character to separate our two 

 American species from the European, while the front of the European is 

 redder, the front edge of the front being white, and the wings uniformly 

 greener. 



Length of body, <?, 0.50-0.60, 9, 0.50; of fore wing, 3, 0.75-0.85, 9, 

 0.90-1.00 ; expanse of wings, 1.45-2.00 inches. 



Montreal, Canada (Lyman); Brunswick, Me. (Packard); Portland, Me. 

 (Morse); White Mountains, N. H.. July 20-30 (Scudder); New York (Grote); 

 West Farms, N. Y. (Angus); Philadelphia, Pa. (Ent. Soc). 



This species, at once recognized by its pearly-white color and greenish 

 tinge, differs only from the European ntargaritaria in the extradiscal line 

 being bent at right angles on the costa, while in the European species there 

 is only a slight curve. 



Although I originally regarded two Californian examples as distinct from 

 the eastern perlata, on further comparison with more material (2 £ and 5 9) 

 from Vancouver Island, I can see no differences of importance. The western 

 ones are a little larger than the eastern. 



Length of wing of Vancouver's Island specimens, <?, 0.85, 9, 1.00; of 

 a 3 from New York, 0.75; of a 9 from White Mountains, N. II, 0.90, and 

 one from Philadelphia, Pa., 0.95 inch 



