CONTRIBUTIONS TO HISTORY OF THE BRITISH PTEROPHORI. 103 



a series of quadrate patches of brown dots form the dorsal stripe, darker on 

 the l'2th and 13th segments. A few short bristles along the dorsal and 

 subdorsal areas; those on the l"2th and 13th segments are slightly darker. 

 A row of black dots along the spiracular area, indistinct or altogether 

 wanting on the 3rd and 4th segments. Prologs tipped with brown, and 

 the upper portion of anal claspers spotted witli black. Food, Eupatorium 

 cannahimun. Feeds on the flowers. 



Pupa. — Dingy yellowish green, the dorsal area slightly darker ; upper 

 portion of head blackish, as are also the eyes and anal point of l)ody, which 

 latter is rounded ; tip of wing-cases detached. 



Plate II., fig. 1, hemp agrimony {Ewpatormm cannat'mwn[ ; la, larva ; 

 1 h, pupa : 1 c, imago of L. microdactyliis. 



The description given is that of the hybernating larva, for a 

 supply of which I have to thank Mr. Eeclle. I have not had an 

 opportunity of seeing ?i feeding larva yet. 



The larva hybernates in branches or stems of its food-plant, 

 the common hemp agrimon}'. It makes a hole just below one of 

 the joints, and gnaws it waj'' upwards for about half an inch above 

 the joint ; here it prepares a snug chamber, in which it remains 

 as a larva until April, when it turns to a pupa. When, as some- 

 times happens, a larva pierces the stem midioay between tlie 

 joints, a slight thickening of the skin, &c., is observed just above 

 the hole. 



(Edematophorus, Wallgn. 

 Lithodactylus, Tr. 

 Similidactylus, Dale. 

 (Plate II., Fig. 2.) 



Imago. — Expanse, 12-14 lines. Fore wing whitish grey, sometimes 

 so thickly powdered with brown scales as to appear of a uniform grey- 

 brown colour; freshly disclosed specimens exhibit a slight rosy tinge in 

 certain lights. The costa is narrowly margined with dark brown to just 

 beyond the middle, where is situated a blackish linear spot, from the 

 hinder edge of which a whitish line runs to the middle of the wing, ter- 

 minating between two blackish spots at the digital juncture ; the outer spot 

 situated near the juncture is of small size, and not always clearly defined. 

 In some examples the costal spot and the largest juncture spot are con- 

 nected by a blackish shade ; in such instances the whitish line is hardly to 

 be traced. Tip of outer digit pointed, and very slightly hooked. Fringes 

 grey-brown, with darker scales, more especially at the angle of outer and 

 tip and angle of inner digits. Hind wings dark grey-brown ; fringes dark 



