270 PSTCHE. 
is shaped in the 7-days’ chrysalis much 
as in the pupa of Hamadryas io, to be 
deseribed further on, and is about 5.25 
mm. long, scarcely 1 mm. broad, cylin- 
drical, and at tip bluntly and regularly 
rounded; in the 9-days’ pupa it is flat- 
tened, increasing regularly and con- 
siderably in size, and at the tip slightly 
and roundly invaginate ; it reaches to the 
third abdominal segment, being 4.6 mm. 
long, and its greatest breadth 2.5 mm. 
Next the opening to the ‘‘jabot,” the 
intestinal canal expands to a sort of 
crop, of an oval shape, scarcely longer 
than broad, and about 1 mm. long; this 
opens directly into the stomach, a 
cylindrical tube, tapering in front, about 
8 mm. long, suddenly contracted at its 
posterior end. The intestine in a 7- 
days’ chrysalis is a rather large, cylin- 
drical tube, fully 6.5 mm. long, and 3 
mm. broad, slightly tortuous, especially 
anteriorly; in the 9-days’ chrysalis, 
however, considerable change has been 
effected, for the intestine is now 9 mm. 
long, and only 0.25 mm. in diameter, 
a little larger at the two extremities, 
but otherwise equal and much more 
tortuous; at first it is directed upward, 
forward and slightly to one side for a 
short distance, then it doubles upon 
itself; crosses. to the opposite side, and 
moves upward in a tortuous manner to 
the colon, which it enters a little behind 
and to the left of its anterior extremity. 
The colon in the 7-days’ chrysalis is a 
broadly oval, flattened sac, 1.5 mm. 
long, and 1.25 mm. broad; in the 9- 
days’ chrysalis it is 3.5 mm. long, and 
only 1.6 mm. broad, and gradually 
passes into the broad rectum, which 
seems only a continuation of it. 
In the middle of the thorax the sali- 
vary glands form exceedingly fine, 
crinkled threads, which here collect in a 
longitudinally disposed mass on each 
side of and touching the oesophagus ; 
this mass extends over a distance of 2.5 
mm. and the thread finally ends in a 
bulbous enlargement about 0.2 mm. in 
diameter. 
The malpighian vessels begin to branch 
at a distance from their origin scarcely 
greater than their diameter, and the 
second division occurs at even a less 
distance beyond the first; one of the 
latter branches extends along the su- 
perior lateral walls of the stomach, as 
far as the middle of its anterior half 
(perhaps farther, later in life) and then 
returns; the other branch of the outer 
set passes along the inferior lateral walls 
of the stomach; they are all very 
delicate, measuring but 0.04 mm. in 
diameter, and after their return are 
strongly convoluted, enwrapping the 
intestine but not the colon. | 
Respiratory system. The branchial 
tubes in the posterior part of the body 
are small, but from the third abdominal 
segment forward they commence to 
enlarge ; this is especially noticeable in 
the longitudinal canals, which are largest 
in the first abdominal segments, 0.8 mm. 
in diameter, and are again reduced in 
size in the thorax, where they are from 
0.20 to 0.35 mm. in diameter. 
Circulatory system. The dorsal ves- 
sel is firmly attached to the integument 
between the fourth and sixth abdominal 
segments, which is not the case anteri- 
orly; on all the abdominal segments, 
behind the first, it expands laterally at 
the posterior limits of the segment, so 
