52 NOTIDOBIA CILIARIS 



the form of the genitalia of the male, shown 

 in Fig. 23, and also by the caddis case, which 

 not only resembles that of Sericostoma so closely 

 as to be almost indistinguishable, but is also 

 furnished with a pupal grating which seems to 

 be exactly similar in general design and struc- 



FIG. 23. Genitalia of Notidobia ciliaris, <J , 

 from the side. 



ture, both case and gratings being built on a 

 slightly smaller scale. 



The female may frequently be seen carrying 

 a bunch of bright yellow eggs, and any one who 

 cares to take the trouble can very easily rear 

 this insect to maturity by dropping the eggs 

 into a bowl of water, putting in plenty of fine 

 gravel and sand to provide material with which 

 the caddis may make and enlarge its case. 

 The period of development from the egg to- 

 maturity is roughly twelve months. 



