308 
the third and fourth are slightly more 
than one millimetre apart, and separated 
by a slightly greater distance than any 
two of the abdominal ganglia; the angle 
of the cords between the third and fourth 
body-segments is much nearer the latter 
than in Danais; the last two ganglia are 
so closely united as to appear as one 
long ganglion, and they are not quite so 
far removed from the tenth ganglion as 
that is from the ninth. In at least the 
abdominal segments, the lateral nerves 
are thrown off from the cord at a dis- 
tance from the ganglia equal to the 
width of the cord. 
Glandular system. The silk vessels 
pass as slender, broadly curving, but 
not tortuous, thread-like tubes beside the 
intestinal canal for some distance, when 
they curve inward so as to meet beneath 
the stomach and run side by side, ex- 
panding rapidly and greatly to a cylin- 
drical tube 0.3 mm. in diameter in the 
front half, about half that in the pos- 
terior portion as far as the middle of 
the second abdominal segment; here 
each diminishes rapidly in size, sud- 
denly turns back upon itself and then, 
again resuming its former direction, ends 
in a delicate thread. 
PSTCHE. 
Female generative organs. 'The ova- 
ries, situated in the hinder half of the 
fifth abdominal segment, are 0.4 mm. 
long, oblong ovate in shape, and of a 
white color. 
Rudiments of wings. The wing-pads 
of the mature larva are nearly circular, 
flattened disks, a little more than a mil- 
limetre in diameter, directed backward, 
those of opposite sides turned a little 
toward each other, the metathoracic 
overlapping the nearer edge of the 
mesothoracic, and originating upon the 
dorsum, so near the median line that ~ 
the inner edges of those on one side 
meet the corresponding parts of those 
on the other, resembling in their disposi- 
tion the appearance of the wings in the 
pupae of ephemeridae, and having the 
very opposite position to that which they 
will finally assume in their own pupal stage. 
What is still more to be remarked is that 
they originate very far from the tracheal 
trunks, and I did not see that tracheal 
tubes of any sort passed to them. ‘Tra- 
ces only of vessels can be seen in their 
interior, but no such definite arrangement 
of branching tubes as was noticed in 
Hamadryas ; these did not seem to run 
to the base of the wing-pad. 
9. LARVA OF EURYMUS PHILODICE, OF N. AMERICA. 
Muscular system. <A set of nearly 
parallel, but slightly converging bands 
runs from beneath the insertion of the 
longitudinal ventral muscular ribbons to 
the ventral line, terminating at the mid- 
dle of the anterior half of the succeed- 
ing segment. As to the dorsal muscles, 
the three longitudinal strips found on 
each side of the dorsal line are not con- 
tinuous from segment to segment; the 
inner band of each segment broadens 
posteriorly to cover the base of the inner 
two of the succeeding segment; the 
middle band is continuous with the outer 
of the succeeding segment, and the 
outer stops altogether at the end of the 
segment; so that each line of muscles 
is oblique and extends over three seg- 
