Silk-producing Bombycide. 321 
When mature the ground colour becomes yellowish-white 
beautifully and closely marbled over with orange, dark ash-grey, 
leaden blue and brown; the second and third segments swollen into 
a large globose mass ; the anterior segment creamy-yellow, which 
colour extends backwards on each side in a broad band through 
the sixth segment. This resembles the ashy band apparent in the 
worm of &. Mori, after reversion to its natural dark hue. There 
are two dorsal rows of long, black, slender and sharp-pointed 
spines commencing with the fifth segment, their base being orange- 
brown, and the four anterior segments being without them, as in 
Attacus Atlas; on the anal shield are four somewhat conical 
orange-brown rudimentary tubercles, and rows of small ones 
along the sides ; the dorsal portion of the four anterior segments 
clouded or blotched with dull leaden-grey markings, apparently 
showing from beneath the skin; on the third segment are two 
brown spots or ccelli, marked within with several minute irregular 
dots of bluish-white; on the front of the second segment are two 
similar round spots, having a narrow edge and central dot of 
bluish-white ; there are likewise several black spots both before 
and behind these ocelli; on the fifth segment are two irregular- 
shaped jet-black spots dotted with bluish-white, and from the 
centre of these springs the first pair of dorsal spines, which are 
altogether black : head mottled brown and grey. 
It is, however, almost impossible accurately and minutely to 
describe the distribution and blending of the various colours with 
which the insect is ornamented. 
The cocoon is spun within the leaf from the beginning of May 
to the end of that month, according to the time of hatching, but 
I have sometimes taken cocoons as early as the 15th of April and 
again in September. 
The figure of the moth, as represented on pl. 12 of Westwood’s 
Cabinet of Oriental Entomology, is, in several respects, very faulty, 
owing to the specimen sent to him having been injured during its 
long journey. 
Expanse of wing in the male 1? inch; of females in general 
23, inches. A black transverse band crosses the upper part of 
the abdomen at the waist, the posterior edge of which is bordered 
by a narrow line of ash; on the reflected abdominal margin of the 
hinder wings are two white spots; all the markings on the wings 
are of the same character as those upon the wings of B. Mori, 
but are far better defined and more intense than those in West- 
wood’s figure. On the hinder wings the sub-marginal line is 
ash-coloured, as is also that on the upper wing. The plumes of 
