Structure and Life-history of the Holly-fly. 267 
Fig. 6. 
Head and thorax of larva of 3rd stage, lateral view. jf, forked 
plate of endocranium ; m, median ditto; sp, anterior spiracle ; 
t, tentacle. (x 200.) 
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Sees > . , , 
ree 7s 
Portion of segmental band of hooks from larva of 8rd stage, 
showing the muscular insertions (dotted); the hooks point 
backwards. (x 480.) 
