LÉPIDOPTÉROLOGIE COMPARÉE 361 



The primary tubercles are very simple, being nierely small 

 chitinized portions of the body area bearing short fine hairs. 



Ventrally, the ground colour is ahiiost unbroken except for a 

 weak représentation of the double medio-ventral stripe of sonaria, 

 which is much more clearly indicated on the subsegnient on which 

 are the yellow bars. The legs and prolegs are ail greyish black, 

 and are quite of the appearance of sonaria. At the base of the 

 legs are white bars. The anal prolegs are provided with a black 

 plate behind. 



3rd INSTAR. 



Length at end of this instar 13,5 mm. 



Greatest breadth 1,4 mm. 



Head 8 mm. 



It is now much more like the adult larva, that is to say, to the 

 naked eye, it is very like a sonaria larva — a resemblance that 

 disappears when we examine it under a lens. 



Head. The head is marbled, being a mixture of black and a 

 paler grey in colour. There is no indication of the purple of 

 hirtarïa. In shape, perhaps, it is more like sonaria, but it tends 

 to slope backwards and the tendency to notchmg seen in hirîaria, 

 is présent in a reduced degree. 



Body. The shape is now totally distinct from that of hirtarïa, 

 which has actually, although not proportionately, a larger head, 

 and even m proportion, a longer body and very prominent sprea- 

 ding prolegs. It is stouter than hirtaria and is more evenly cir- 

 cular in section. The ground colour, now, is a grey black — not 

 uniform m tone — upon which the longitudinal stripes, with their 

 pale grey lilling in and jet black edging, stand out very conspi- 

 cuously. Those forming the medio-dorsal stripes are most regular, 

 and they are ûlled in with a grey tending to yellow. This stripe 

 usually expands to embrace the remnants of the yellow bars, but 

 there is much variation in this respect, for sometimes the bars are 

 quite as prominent as they were at first, and sometimes they are 



