ATTACUS ATLAS: A LIFE-HISTORY. all 
quadrantic, wide, and of a lovely light scarlet, or miniate, hue, the inclosed 
area being azure. 
The spiracles are rather large, ovate, and of the same azure hue. The 
pro-thoracic segment has its front edge now quite smooth ; whereas in the 
previous ages it carried four protuberant teeth, the progressive obliteration 
of which well marks the successive ages; for, so late as the 3rd age, these 
are long (as long as the tubercles), flexible and tentaculoid ; in the 4th, 
much reduced, but still tooth-like: in the 5th, mere blue kuobs; and in 
the 6th, wholly obliterated, or recognisable only as a slight transverse ridge 
just behind the collar-edge. The head is of the common light-green hue, 
polished, the clypeus marked by a triangular black line; the ocular patch 
black ; lip and palpi azure ; jaws black. A streak of shining black, on each 
cheek, is visible when the head is protruded, as in eating or crawling. 
The whole skin of the upper parts, down to the line of the spiracles, is 
studded with those curious specks, which I suppose to be glands, more or 
less round, dark pellucid olive in hue, most conspicuous on the thoracic 
region, where they are occasionally confluent. Their surface is everywhere 
level with the skin, save around the edge of the pre-anal shield, where they 
become tiny conical warts, of a blue-black hue. ‘The tubercles of the 
abdominal segments, in repose, lie flat, pointing backward and overlapping ; 
so as, in their aggregate, to convey the impression of four bluish-white 
thick keels, or longitudinal ridges, along the body. In the extension of 
the body for crawling, they are slightly elevated, and then reveal their true 
character. 
The four caterpillars remaining of the fifth age, now suddenly 
died; all of a disease of the bowels, the feces becoming soft, 
clogging the margin of the rectum, and ultimately changing to 
a brown fluid. The solitary survivor of so numerous a family 
continued a fortnight longer, apparently prospering, and attaining 
the size and beauty which I have sought to represent in the plate, 
fig. d.; after a time, however, eating less and less, and diminishing 
in size. My willow tree was fast denuding; the leaves grew less 
attractive, less nutritive,—perhaps even unwholesome. At length, 
on the 20th of October, I was dismayed by observing the familiar 
symptoms of incipient diarrhea, in the softened clogging feces. 
Thad just been reading Dr. Le Doux’s valuable Memoir (Bull. 
Soc. Acclim., Aug. 1878) ‘“ De Vinfluence de Quinquina sur les 
Vers a sole.” I immediately applied Quinine to my little patient, 
bedewing it, and its food-leaves, with a very weak solution. I was 
gratified by seeing that it presently began to eat; that it ate 
freely, necessarily receiving a minute amount of the drug into the 
