1869.] 243 
tliey had fed, and from that time all went well : and after Mr. Hudson's 
attention had been directed to Ornithopus perpusillus, he satisfied him- 
self that in his locality the butterfly did not occur away from that 
plant ; so it seems there is little doubt of its being the natural food. 
When first hatched the larva is about three-fourths of a line 
long, thick in proportion, of equal bulk and rounded at either end, 
hairy and of a dull bluish-green colour, its powers of locomotion of the 
very feeblest description. 
By May 3rd they had become rather more than a line in length, of 
a drab colour, and hairy like the leaflets on which they were feeding. 
By May 29th they had grown to about a quarter to three-eighths of an 
inch in length, eating not through the leaflets, but only the green 
cuticle : at this time they were of a deep yellowish -grey, and the dorsal 
stripe blackish olive edged with whitish, and a whitish line along the 
lateral ridge above the legs ; the sub-dorsal stripe being triple, i. e., 
two lines of blackish-olive with a whitish-grey one between them. The 
surface generally studded with minute blackish points, each bearing a 
fine short hair. 
By June 11th to 15th they had all assumed their last coats. 
The full-grown larvae is about seven lines long, thick in proportion, 
and of the usual onisciform or Lyccena shape. 
The head small, and retracted when at rest or alarmed, the second 
segment the longest, rounded, and very slightly flattened above ; the 
others as far as the tenth with raised prominences on each side of the 
back, and a dorsal hollow between them ; the sides sloping to the lateral 
ridge ; the ventral surface rather flattened ; the legs all placed well 
underneath. The three last segments without dorsal ridges, and sloping 
gradually to the sides and anal extremity, their sides rather concave, 
a very prominent wart on each side of the twelfth; the segmental 
divisions not observable on these last, but well cut on all the others. 
In colour the larva is now a bright yellow-green, with the dorsal 
stripe blackish-brown edged with whitish from the beginning of the 3rd 
to end of the 10th segment, it is widest on the 3rd and 4th, being on 
them of a rather rounded lozenge form, with a whitish dot near the 
edge on each side ; a dull dark-brown small plate in front of second 
segment, and a broad semi-lunar shaped blotch of same colour a little 
behind and divided in the middle by a fine line of the green ground 
colour. The dorsal stripe on the eleventh segment becomes broad and 
squarish, but resumes its linear shape on tlie twelfth and thirteenth. 
The sub- dorsal line is visible from the beginning of the third to the 
end of the eleventh segment as a greenish-yellow line running between 
