CONTRIBUTIONS TO HISTORY OF THE BRITISH PTEROPHORI. 277 



I was this year fortunate enough to find five larvse of this 

 species in one of its old localities, and felt exceedingly glad to 

 renew its acquaintance after a lapse of seven years. 



Pterophorus, Wallgr. 

 monodactyliis, L. 

 pterodactyla, Hb. (us), D. L 



(Plate I., Fig. 4.) 



Imago. — Expanse, 10-12 lines. Fore wing whitish or grayish brown, 

 in some examples pale ochreous brown ; a small irregular shaped black spot 

 at digital juncture, and a black dot between this and the base of the wing. 

 Fringes gray-brown, with two brown dots in the apical margin of outer 

 digit, and three black dots on the margin of inner digit (one at the tip, one 

 at the angle, and one midway between these two). Hind wing and long 

 silky fringes gray-brown. Head and thorax colour of fore wing. Abdomen 

 gray-brown, with a whitish median stripe intersected by a blackish line; 

 tliis latter swells out into somewhat lozenge-shaped spots at the segmental 

 divisions. Legs gray-brown. July to April ; most frequently met with in 

 September. 



Larva. — Length, 6-7 lines, tapering posteriorly. Head much smaller 

 than 2nd segment, pale brown, sometimes with a greenish tinge ; mandibles 

 brown, a black spot on each cheek. Ground colour dingy green, streaked 

 and dotted with whitish, and somewhat suffused with red-brown. Dorsal 

 stripe is dilated on the crest of each segment, forming a series of lozenge- 

 shaped marks, either dark green or red-brown. Tubercles, two dorsal rows 

 (four on each segment), but little paler than the ground colour, with tufts 

 of whitish or pale brown hairs ; subdorsal, one on each segment, also with 

 a tuft of whitish or pale brown hairs ; spiracular, one large transparent 

 tubercle, with tuft of whitish or pale brown hairs on each segment, and a 

 smaller one on the posterior edge of the 4th to 11th segments ; these last 

 have short whitish or pale brown bristles. Prologs and anal claspers pale 

 brown, tinged with greenish. Food, various species of Convolvulus ; eats 

 flowers, buds, and leaves. June to September. 



Pupa. — Green at first, afterwards pale dingy brown, more or less 

 suffused with reddish brown along the dorsal area. Dorsal and lateral 

 lines interrupted, blackisli brown ; warts and liairs as in the larva, except 

 that some of the dorsal series are blackish. Head flattened, marked with 

 brown, and thickly covered with short hairs. Wing-cases yellowish green, 

 faintly streaked with brown. Attached by anal segment to stem of food- 

 plant or other object near. June to September. 



Plate I., fig. 4, Pterophorus monodactijlus ; 4 a, larva feeding; 

 4 h, larva enlarged ; 4 c, pupa enlarged ; 4 d, Convolvulus. 



