300 LÉPIDOPTÉROLOGIE COMPARÉE 



and more regularly cylindrical. Drnhami in this respect is near to 

 sonar ia, but it is a trifle longer than the larva of that species 



Head. The head is black with one or two irregular paler 

 markings, representing in a very reduced form, the yellowish 

 markings of zonaria. In shape, the head, while not so square eut 

 as in zonaria, does not slope back so much as in hirtaria. The 

 usual weak setœ are présent. 



Body. The ground colour is blackish grey. 



The iive transverse bars on the first abdominal segments are 

 yellow, and are still quite distinct. In zonaria, they are rather 

 weak and are primrose in colour. Thèse bars, m many spécimens, 

 appear on the other segments and thus anticipate a condition 

 quite usual in hirtaria in subséquent instars. 



The longitudinal stripes ■ — the doubled medio-dorsal, the sub- 

 dorsal, and the supraspiracular — are ail présent. The two medio- 

 dorsal stripes are much interrupted as in zonaria, and like that 

 species, are dilated at the bars and at corresponding points in the 

 other segments, but, as in hirtaria, are much more definitely marked 

 after the bars. The other stripes are very zonana-V\\<.Q in character. 



The collar, which is composed of well defined yellow spots, 

 and the two yellow spots, which précède the anal plate, are clearly 

 marked and give us the most important hirtaria points in this 

 instar. 



To the naked eye, the broad spiracular line is of the zonaria 

 type but, under a lens, it résolves itself into a bright yellow spot, 

 carrying one of the primary setap common to both of the parent 

 species, together with a séries of interrupted bow-shaped Imes of 

 varying breadth, thus forming a compromise between the yellow 

 stripe of zonaria and the fine white dashes of hirtaria. This line 

 continues fairly level before the yellow spot but becomes narrow, 

 and dips behind it. 



It is much more developed on the thorax and last abdominal 

 segments than in hirtaria. The black spotted anal plate has two 

 jet black marks much larger that the rest and is tipped with 

 black warts bearing short, stiff bristles. 



