GROWTH AND TRANSFORMATION i8i 



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Fig. si.— Larva ("Apple Maggot") of Trypetid F\y (Rhagoletts 

 pomonella) . A, lateral view, X lo ; B, diagrammatic longitudinal section 

 through anterior region; C, pharynx and mouth-hooks, lateral view, 

 X 30; D, section through anterior region of maggot, X 30. i, pro- 

 thorax; 2, mesothorax; 3, metathorax ; /, first abdominal segment ; 

 F///, eighth abdominal segment ; ^ , anterior lateral plate of pharyngeal 

 skeleton; ah, antennal bud in frontal sac; An, anus; yl 6^, anterior 

 spiracle ; Atr, atrium, anterior, part of larval pharynx resu ting troni 

 involution of original head of larva; B, posterior lateral plate ot 

 pharyngeal skeleton ; Br, brain ; C, dorsal or wing plates of pharyngeal 



