PROC. ENT. SOC. WASH., VOL. 22, NO. 8, NOV., 1920 I'.'/ 



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Days 



Fig. 2 Graphs indicating the width of the body and the head of Phryganidia 

 i (ilifoniica caterpillars, during the different instars. 



Days" 



Fig. 3 Curve indicating the length of Phryganidia californica caterpillar^, 

 during the different instars. 



instar the caterpillar attains its maximum length and then begins 

 to shorten until it has lost about one-third its length, at the 

 same time swelling appreciably. Finally the skin splits down the 

 dorsum, the back of the head splits open and the pupa appears. 



Mctlmds of Rea riii!!. 



It may be of interest to know how these caterpillars wuv 

 reared and the measurements obtained. They were measured ;i 

 short time after hatching and then placed on a spray of live oak 

 leaves. The stem of this twig W;IN put in a small bottle of water 



