PLATE 11 



The ribbed-cocoon maker {Bucculatrix pomifoliella), a small caterpillar 



that inhabits apple leaves 

 At A the caterpillar is spinning a mat of silk on the surface of a twig. 

 B shows the silk thread issuing from the spinneret (a) on the under 

 lip of the caterpillar. At C the caterpillar is erecting a line of silk 

 palisades around the site of the cocoon. D and E show the cocoon in 

 the course of construction, built on the silk mat. F is a diagram of 

 the cocoon on under surface of the support, containing the pupa (g) 

 and the shed skin of the caterpillar {h). G shows the interior of the 

 cocoon, its double walls (c, d), and partitions (/) at the front end. 

 H is the finished cocoon surrounded by the palisades 



