170 LEAF-MINING INSECTS 



larger than the larva, but broadening at its anterior end toward 

 the tip of the leaf, slightly inflated, and showing as a convexity 

 on the upper surface of the leaf. Within this cavity, which is 

 silk-lined, pupation takes place. Beyond the pupation chamber, 

 the mine extends a short distance forwards, but is scarcely visible 

 except at its end, where the epidermis is almost eaten through, 

 permitting the emergence of the imago. 



There is apparently but one generation a year; the moths appear 

 from the latter part of May to July. 



The work of another species, C. clandestinella, in a differ- 

 ent species of panic grass, P. clandestinum, which differs in 

 several minor points, as shown by Busck's (1906) descrip- 

 tion: 



Mine with the frass ejected at one end. The larva is light 

 green with short light hairs and with yellow head and thoracic 

 shield. At maturity it assumes a brilliant wine-red color in three 

 broad longitudinal stripes, and cuts a circular piece out of the 

 epidermis of its mine, which it bends lengthwise and uses for a 

 cocoon exactly like the genus Cycloplasis Clemens. 



