

576 THE AMERICAN NATURALIST. [VoL. XXXVI. 
the numerous little, black, scalelike hairs which so thickly cover 
the body ; large hairs have larger bipolar nerve cells (Fig. 3). 
Günther (01) shows scales of a lepidopterous wing with 
nerve cells at the base of both simple and glandular scales, 
probably a similar result to that just described in Corydalis. 
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Fig. 21. Fig. 22. 
Fic. 20. — Bases of large and small hairs from Datana, showing their bipolar nerve cells. 
Methylen blue. 
Fic. 21. — Section through center of hair of Motolophus leucostigma. 
Fic. 22. — Cluster of spines from Io. (X 17.) Methylen blue. 2, hairlike spine ; 5, usual 
type of spine. 
Fic. 23. — Large and small hairs from beetle larva with their sense cells and nerves. 
Methylen blue. 
A SUMMARY. 
1. Lepidopterous larvæ are clothed with hollow hairs, each 
of which is supplied by a bipolar nerve cell, a process of which 
penetrates a short distance into the hair and probably termi- 
nates before reaching the tip. 
2. In most species all body hairs are sensory; large hairs 
. are supplied by large bipolar nerve cells, and small ones by 
smaller bipolar cells. 
: » Under the hypodermis of caterpillars there is a system 
: ar cells more or less intimately connected with nerve 

