146 THE ENTOMOLOGIST. 



Plattptilia, Hub. 



Dichi'odactylus, Muhlig. 

 (Plate III., Fig. 2.) 



Imago. — Expanse, 12-14 lines. Ground colour or fore wing whitish 

 ojhreous, much clouded with cinnamon-brown. The costa is narrowly 

 cotted with dark brown to beyond the middle, where is situated a narrow 

 cark brown linear spot ; beyond this the edge of costa is yellowish ochreous, 

 jroken by another dark brown spot of variable size and intensity ; a small 

 dark brown spot at the digital juncture, and the fissure and hind margins 

 of both digits are outlined with dark brown. Fringes slightly paler shade 

 of ground colour ; a tuft of brownish scales at the angle of inner digit, and 

 a smaller tuft on the inner margin. Tip of outer digit produced and 

 slightly falcate. Hind wing, 1st and 2nd feathers brown with a faint 

 purple tinge, fringes paler ; shaft of 3rd feather pale ochreous ; fringe 

 whitish ochreous at the base and grey towards the edge. Head, thorax and 

 abdominal juncture whitish ochreous. Hind legs whitisli, with three brown 

 patches, one small and one large on the tibiae, and a small one on the tarsi. 

 These markings are only to be observed in bred or fresh-caught examples. 

 July. 



Larva. — Length 8 lines, slightly attenuated posteriorly. Head 

 yellowish green, with brownish mandibles, and a black spot on each cheek. 

 Ground colour greerj. Dorsal stripe whitish, broken at the segmental 

 divisions ; a median line of the ground colour is intersected by the darker 

 alimentary canal. Subdorsal and spiracular lines whitish, interrupted at 

 the segmental divisions. Tubercles inconspicuous ; dorsal, two rows (four 

 on each segment) blackish, each emitting a single short whitish hair ; sub- 

 dorsal, a row of black warts, each with a single short white hair. Numerous 

 minute whitish bristles all over the body. The spiracles are dark brown, 

 with yellowish centres ; anal segment tinged with j'ellowish and shining. 

 Prolegs and analclaspers semitransparent, with a greenish tinge and tipped 

 with brown. Food, tansy (Tanacetum vulgare.) An internal feeder ; bores 

 into the stem at the axil of upper leaves, and its presence may be detected 

 by the frass exuded from the point of entry. May and June. 



Pupa. — Whitish green, streaked dorsally and laterally with olivaceous 

 brown ; thorax humped ; from the head is a beak-like projection, which is 

 whitish in front and blackish at the sides ; the lower portion of antennae- 

 cases are detached from the abdomen. 



In confinement suspended by the tail from under side of leaf of food- 

 plant. June. 



Plate III., fig. 2, tansy {Tanacetum vulyare); 2 a, larva; 2 Z^, pupa; 2 c, 

 imago of P. dichrodactylus. 



I have to tliaiik Mr. Sang, of Darlington, for kindly sending 

 me larviB of this species. 



