62 LEPIDOPTERA. 



The head is honey-brown, with a black hind-margin; the 

 thoracic shield on the second segment is black, pale-margined 

 on its anterior edge, divided by a fine pale median line; 

 pectoral legs, anal plate and outer side of the anal prolegs, 

 black; the ventral prolegs are of the general colour of the 

 body. Immediately behind and under the anal plate, exactly 

 above the anal opening, is a small semicircular plate of black 

 chitine, about half the size of the anal plate itself, which is 

 extended posteriorily in 6 long black thorns, and probably 

 has for its object to assist in the evacuation of the excrements. 

 If one holds the larva between the fingers, one can easily see 

 this rake-like plate of chitine when examining it with a simple 

 lens. This formation is entirely wanting in the closely allied 

 Sc. Wahlhomiana, but on the other hand it occurs again in 



Again, on the ventral surface of each of the segments, which bear no 

 feet, are also 4 warts, which are arranged in one transverse row, and the 

 2 inner warts are much smaller than the 2 outer ones. This, then, is 

 the arrangement on the ventral surface of the 5th and 6th, and also of 

 the 11th, 12th and 13th segments. The 2nd, 3rd and 4th segments bear 

 the pectoral legs, which are surrounded at the base by a horny ring. 

 The 7th to 10th segments bear the ventral prolegs, on the outer side of 

 which is a small, elongate horny border, whilst on the inner side is a 

 homy wart. The 2 outer warts of the 13th segment stand rather farther 

 apart than the 2 inner ones, and are placed more backwards laterally. 



On the outer side of the anal prolegs are likewise always a pair of 

 horny warts. 



Each segment has therefore 4 dorsal, 4 ventral and 3 lateral (on each 

 side) warts : exceptions are made only by the 2nd and 13th segments and 

 the ventral surfaces of those segments which bear legs. 



Most of the warts bear only a single hair, but many, especially the 

 larger ones, bear 2, — as, for instance, the dorsal warts of the 3rd, 4th 

 and 13th segments, the middle lateral warts, from the 5th to 13th seg- 

 ments, probably also the outer ventral warts. The thoracic shield bears 

 (on each half) 6 symmetrically-arranged hairy bristles, the anal plate 

 bears 8 such bristles. 



