i 
(ecto i Wi OO es 1 Se 
FRAGMENTS OF THE 
COARSER ANATOMY OF 
DIURNAL 
LEPIDOPTERA. 
BY SAMUEL H. 
SCUDDER, CAMBRIDGE, MASS. 
(Concluded from p. 309.). 
10. THE LARVA OF HEUPHOEADES TROILUS, OF NORTH AMERICA. 
\ 
Muscular system. The longitudinal 
system of muscles, which we have usually 
found to be made up on the dorsal and 
ventral surfaces of each half of the body 
of double or treble bands, is here com- 
posed both above and below of one broad 
ribbon on each side. 
ones is made up of about fifteen, of the 
upper of about twenty-five, closely con- 
tiguous but independent cords similar to 
Each of the lower 
one another in every respect. 
The investing muscular walls of the 
stomach are thicker than usual and al- 
most entirely composed of transverse, 
parallel, fibres, with a few 
hardly noticeable longitudinal threads, 
muscular 
and a dorsal ribbon of a dozen or more 
parallel threads besides a similar ventral 
band. 
Digestive system. 'Vhe stomach is 6.5 
mm. in diameter: at its extremity an 
investing band of strong muscles enwraps 
the canal, contracting its diameter to 
1.75 mm.. while the intestine is 3 mm. 
broad; the intestine and colon are very 
short (together 7.5 mm. long) compared 
with the stomach. and so also is the 
oesophagus. 
The malpighian vessels originate in a 
very slender thread. 1.1 mm, long, which 
then expands into a vermiform, subfusi- 
form, swollen gland, 1.45 mm. long and 
0.45 mm. broad, contracted slightly be- 
fore the bluntly rounded apex ; the lower 
branch is thrown off from its tip, and 
immediately afterward the other two; 
they are very slight and very short as 
compared with Danais or Eurymus; the 
upper branch extends as far as the pos- 
terior margin of the fourth abdominal 
segment. 
The nervous cords 
are closely united, but can be seen to be 
distinct. throughout their whole length. 
The distance between the first and sec- 
ond body-ganglia is 2.56 mm.; between 
the second and third 3.25 mm. The 
cords at each side of the third are paral- 
lel for a very short distance and then 
diverge. 
Nervous system. 
The fourth ganglion is 1.75 
min. distant from the third, and is situa- 
ted near the middle of its segment, while 
the others, as a general thing, are near 
The 
tenth and eleventh ganglia are completely 
united; together they are no broader 
than, but twice as long as, the ninth 
ganglion ; from the posterior border, four 
long, equal and equally divergent nerves 
are thrown off. two on one side and two 
the anterior edge of the segments. 
