162 BRITISH BUTTERFLIES. 



ventral position (in most attitudes) of the head. The dorsal "level" 

 extends from the 2nd thoracic to the 6th abdominal segment, is widest 

 on thorax, and consists, on each segment, of a central greenish line, 

 then a brown or reddish line, wider posteriorly, and, outside this, a yellow 

 line on the ridge separating the "level" from the "slope." This 

 yellow line is a little oblique, further from the central line at the 

 posterior margin of each segment than p,t the front, owing to the 

 brown mark being wider behind. This yellow line is on a ridge, and 

 the centre of the "level " is really depressed, but the coloration makes 

 this look much more than is really the case. On the mesothorax the 

 red (or brown) takes a median position, and is nearly wanting on 

 metathorax, and, on the 6th abdominal segment, it is much darker, and 

 fills the whole space between the yellow lines ; it is repeated on the 

 front margin of the 7th abdominal segment, and on the 9th and 10th 

 is a median line. The "slope" is green, with two oblique yellow lines 

 on each segment, so placed that the lower is in line with the upper one 

 of segment in front ; the upper line is hardly divided by a narrow shade 

 from the marginal yellow of ridge of "level." At more than one point 

 on each segment, but especially at one between the yellow lines, is a 

 depression as if the skin were tied down at a central point. The lateral 

 flange has an upper rounded, and a lower sharp, margin, and seems 

 uncertain whether to be brown or yellow, a pinkish-brown being 

 marked on front and on the last abdominal segments. The pro- 

 thorax has the "flange" passing across its front, where it is very 

 broad ; the segment is green, verging to yellow at the lower 

 margin of the flange, and having, centrally to its hindmargin, a 

 small ochreous diamond, the prothoracic plate, the only item of 

 this colour on the larva ; it is depressed, as if tied down or buried 

 in the swollen ordinary skin about it. The head is quite black. 

 The legs fuscous but not black. The head is easily extended to the 

 front in ordinary position, but is usually sunk into what is really the 

 front, but in position is the ventral aspect of prothorax ; when so sunk, 

 the yellow margin of the hollow ranges with the lower flange at the 

 base of the prolegs, and there is a perpendicular front between this 

 and the margin that ranges with the marginal flange of the larva, 

 which is the upper member of the usual double lateral flange, as 

 visible on most larvae. When at rest, the front of the mesothorax 

 stands up above the depression caused by the prothoracic plate, and the 

 prothorax (seen laterally) looks like a round ball against the lower 

 half of the front of the larva. The larva is clothed with fine hairs, 

 which are longer and most abundant along the longer marginal flange 

 and the dorsal ridges ; on the latter are, especially, two longer ones, 

 directed backwards and forwards, that may very w T ell represent i and 

 ii ; these are pinkish-brown; the fine hairs on the "slopes" are 

 colourless. No lenticles are definitely made out, though there are 

 some circular areas that may represent them. The spiracles are 

 nearly of the same colour as the prothoracic plate, but rather brighter; 

 they are just above the hollow above the marginal flange, that on the 

 8th abdominal segment is larger and much more dorsal in position ; 

 on the 7th abdominal, just behind the brown (pink?) mark, is a trans- 

 verse depression, with parallel marginal line or fold, that represents, 

 and though not seen in action, probably is, the dorsal gland of the 

 Lycamid larvae. The undersurface is of a more translucent green than 



