BOARMID^—SELIDOSEMA. 33 



Laea'A about 1} inoh in lengtli, and moderately stout in 

 proportion; head narrower than the second segment, into 

 which it can be partially withdrawn ; face flat, and there is a 

 slight depression on the crown ; body of nearly uniform 

 width throughout, and cylindrical, but the segments over- 

 lapping, and each being divided into sections by transverse 

 ribs, together with the possession of a prominent ridge along 

 the spiracles, give it a somewhat uneven appearance ; the 

 anal segment ends in a rather sharp triangular appendage, 

 and the anal legs being set widely apart are very conspicuous ; 

 skin smooth, but tough. Ground colour uniformly pale 

 stone-grey ; head of the same colour, with a dark crescentic 

 mark surmounting each mandible, and another similar mark 

 above these; the mandibles are brown, of a still darker 

 shade ; a double black-brown line extends through the dorsal 

 area ; on the anterior segments it is paler and more uniform, 

 but after it reaches the fifth it becomes swollen and darker 

 in the middle of each segment, which gives it a conspicuous 

 and rather interrupted appearance ; subdorsal and spiracular 

 lines pale grey, the latter rather prettily edged above and 

 below with chocolate-brown, the brown being most notice- 

 able on the anterior segments ; the spiracles, and four very 

 distinct dots on the dorsal area of each segment, intensely 

 black. Ventral surface yellower-grey, with a broad median 

 pale band enclosing a fine double reddish-brown line ; outside 

 the band, but adjoining it, on segments six to ten, is a con- 

 spicuous dark smoky mark ; and between the pale band and 

 the spiracular region is another faint pale line. (G. T. 

 Porritt.) 



September to April, on heather (Callmia vulgaris), feeding 

 sparingly throughout the winter, always at night. At this 

 time it may also be found resting upon the heath grasses, and 

 may possibly sometimes eat them. Abroad it seems to have 

 a more extensive range of food-plants, among which are 

 included species of Lotus, Vicia, Genista, Dorgcnium, and 

 Bumex. 



VOL. VII. c 



