CONTRIBUTIONS TO HISTORY OF THE BRITISH PTEROPHORI. 105 



Leioptilus, Wallgn. 

 Lienlgianus, Zell. 

 (Plate II., Fig. 3.) 



Imago. — Expanse, 9-10 lines. Ground colour of fore wing whitish 

 brown, more or less tinged with ochreous, and sparingly dusted with 

 blackish scales. On the costa are two conspicuous dark brown or blackish 

 linear spots, and at the angle of outer digit is a smaller blackish dot, not 

 always distinct. In close proximity to the digital juncture is a dark brown 

 or blackish linear dash; sometimes this mark is contracted in the middle; 

 between it and the base of the wing is a small blackish dot. Fringes grey- 

 brown ; digital margins darker. Tip of outer digit acute. Hind wing 

 grey-brown. Head ochreous brown; thorax and abdominal juncture 

 whitish. July. 



Larva. — Length 5 lines, attenuated towards both ends. Head shining 

 pale greenish brown ; mandibles pale reddish brown ; crown and spot on each 

 cbeek darker brown. Ground colour whitish green ; segmental divisions 

 paler. Dorsal stripe narrow, a shade darker than the ground colour, witli 

 a very slender whitish median line. Subdorsal stripe narrow interrupted 

 yellowish green. Tubercles, two dorsal rows (two on each segment), 

 whitish, with several moderately long whitish hairs ; subdorsal, a row of 

 smaller warts whitish, with two or three short whitish hairs, and situated 

 a little towards anterior edge of segment; spiracular, one wart on each 

 segment, semitransparent, with a greenish tinge; tuft of hair moderately 

 long. Prolegs and anal claspers shining pale greenish brown, with darker 

 brown markings. Food, Artemisia vuUjaris, on the terminal leaves eating 

 away the fleshy part and leaving the skeleton. May and June. 



Pupa. — Whitish green, with a tine yellowish line down the centre of 

 back, and a few oblique dark dorsal markings ; warts and hairs similar to 

 those of larva. The oblique markings vary in intensity, sometimes giving 

 the whole dorsal area a brown coloration ; wing-cases green ; antennae and 

 legs darker anteriorly. Sometimes the upper part of the pupa is yellowish, 

 with a pink tinge, and the oblique stripes reddish brown. Fixed by tail to 

 under side of leaf of mugwort, the food-plant, looking not unlike the larva at 

 rest. June. 



Plate II., fig. 3, mugwort (Artemisia vulgaris): 'da, larva; Sb, pupa; 

 3 c, imago of L. Lienigianus. 



I am indebted to Mr. Sydney Webb for an opportunity of 

 rearing and describing the larva of this local species. Last year, 

 not far from Instowe, North Devon, I met with a large patch of 

 mugwort, when the terminal leaves of many of the plants showed 

 signs of having been fed on in the manner of L. Lienigianus, but I 

 did not find the insect in any stage. 



p 



