216 BRITISH BUTTERFLIES. 



white line and that of the lateral flange is a dark band, not quite so dark, 

 however, as the other ; and between the two upper white lines is an area 

 of terra-cotta tint, but often with an outlying patch of the lower 

 dark line towards its anterior border. From the dorsum downwards, 

 then we have, (1) very dark, (2) white (dorsal flange), (3) terra cotta, 

 (4) white (narrow, often indistinct), (5) rather dark in patches, (6) 

 white (spiracular), (7) somewhat dark, (8) white (flange line) ; below this 

 is (9) a darkish band, and then (10) the terra-cotta or almost flesh-coloured 

 under-surface. There is a white patch or two on the subspiracular 

 dark surface ; indeed, with a strong lens it is seen that the lines or 

 bands are not definite and outlined, but are more properly aggregations 

 of patches. The whole surface has much the appearance of an old 

 strong door, the very large, shining, nearly black, hair- bases and 

 lenticles, looking like the very large nail-heads, seen on such doors ; 

 the general surface also is finely shagreened with minute black skin- 

 points. The head is shining black. It is almost impossible to tell 

 the spiracles amongst the lenticles, and details of these and hairs will 

 have to be taken from a prepared skin. The longer dorsal hairs are 

 dark, the others, especially the lateral ones, nearly white (or colourless), 

 the longest about Olmm. long. In this (second) instar, the hairs are 

 not so much multiplied as to prevent those of the first instar being 

 for the most part recognisable amongst them. The head is 04mm. 

 across. The prothoracic plate 038mm. across. In one of my 

 mounted specimens, there happens to be presented what I have not 

 attempted to show, but which might easily be done properly, viz., 

 a front view of the prothorax with the head removed, exhibiting an oval 

 opening, # 3mm. across, and 0'2mm. longitudinally ; it shows the 

 very sharp skin-points ending at a definite line, the margins and 

 incurved membrane being smooth ; the incurving of the margin also 

 demonstrates that, when the head is retracted, it is in a bag of which the 

 mouth is contracted by the elasticity of its margin, apart from any 

 further closure that may be produced by muscular action. One feature 

 of the increased number of hairs, is the evident want of symmetry 

 that results, i.e., the increase does not take precisely the same 

 character and amount in one specimen as in another, or even on the 

 two sides of the same specimen, e.g., amongst the various specimens I 

 have mounted, the prothoracic plate has not precisely the same hairs 

 and lenticles in any two specimens. In the one photographed 

 (pi.) each side has one of the two long central hairs about 

 O'limm. or # 15mm. long; it has also, of course, the special 

 filamentous hairs, Olmm. visible, possibly longer. There is also the 

 hair that was on the hind-margin in stage i, but is now free from the 

 plate just behind it; it is short, thick, slightly clubbed, beautifully 

 and densely spiculated, and about O05mm. long. Near the middle on 

 one side, is a large lenticle, on the other side, in correspondence with 

 the lenticle, is a short (O04mm.), spiculated, clubbed hair. In front 

 of this hair, close to the margin, is a similar, but rather smaller hair ; 

 corresponding with it on the other side, and in front of the lenticles, 

 is a small circle, too small to be called a lenticle, but may be called an 

 obsolete hair-base. In front of the special filamentous hair, is an area 

 clouded with fine dots (same on both sides) much smaller than the 

 skin-points which more or less cover the surface of the plate, and, 

 amongst these, one or two minute circles that suggest not so much 



