Floney-Producing Caterpillars. 14! 
patches, where both star and spine are brown. This velvet- 
like condition of the skin only reveals its true composition 
under a magnifying glass. 
On the eleventh segment, near the posterior edge of the 
back, is a transverse slit, in a sub-oval spot, from which pro- 
ceeds a membranous process; and on the twelfth, on each 
side, is a mark like a stigma, but a little larger, from which 
proceeds a membranous tube, ending in a crown of feathery 
tentacles, these three special organs being exposed or con- 
cealed at the will of the larva. The head is small, obovoid, 
dark brown, and is placed at the end of a long, pale green, 
conical neck, which is rectractile, both neck and head being 
covered by the second segment. 
Before changing to a chrysalis, the summer larve some- 
times turn pink, and from pink to brown, or become brown 
without the pink stage, although others remain white or 
change to rusty brown. The body contracts to about three- 
tenths of an inch and takes on a rounded form. 
The chrysalis is dark-brown or yellow-brown, but varying 
in color, the wing-cases being dark or green-tinted. Two 
sub-dorsal rows of blackish dots are found on the abdomen, 
and sometimes a dark dorsal line. In the few instances in 
which the butterfly emerges the same season the duration 
of this stage is from thirty to sixty days, but most chrys- 
alids pass the winter and mature in the spring. 
Now for a description of the butterfly. In general 
terms, the upper side of the wings of the male is a deep 
azure-blue, with a delicate terminal black border. On the 
apical part of the fore-wings the fringes are black, but white 
and barred with black on the rest of these wings and on the 
hind-wings. In the female the fore-wings have a broad, 
blackish outer border, in some examples extending along the 
costa, while the hind-wings have a blackish costa and a row 
of dark spots along the outer margin. Usually the ground- 
color is a lighter blue in the females than in the males. A 
pale silvery gray, with a silky lustre, is the color of the 
