A Lepidopterous Insect. 127 



The Reproductive System. The sexual glands are 

 somewhat difficult to find in alcoholic specimens. They lie 

 in the fifth abdominal segment, immediately beneath the 

 dorsal integument. In favorable specimens a delicate duct 

 may be traced from each, around the intestine, to the lower 

 side of the body-cavity. 



The Nervous System. The nervous system has the 

 same general disposition that has already been noted for 

 related Arthropods. The brain will be found far for- 

 ward, immediately over the mouth, and uniting with the 

 infra- (Ksophageal ganglion through the circum-ossophageal 

 collar. 



From the brain, which is divided into a right and a left 

 half by a median furrow, nerves may be traced to the ocelli, 

 antennae, and to the oesophagus. 



The _/;.$/ or inf r a- cesophageal ganglion innervates the man- 

 dibles, the labium, and the silk glands, and by its two con- 

 nectives unites with the next following ganglia. 



The second ganglion is of relatively small size. It inner- 

 vates certain muscles of the head and neck and the first pair 

 of legs. 



The third ganglion innervates the second pair of legs, while 

 the/0//r//z ganglion supplies the third pair. 



The abdominal ganglia are seven in number, the first 

 abdominal segment bearing the fifth, the second segment 

 the sixth, the third segment the seventh, the fourth segment 

 the eighth, the fifth the ninth, the sixth the tenth, and the 

 seventh the eleventh ganglion. The eleventh ganglion is, 

 moreover, clearly divided into an anterior and posterior half, 

 and is, hence, probably composed of two fused ganglia. 



