PLATE 4 
Rhagoletis pomonella 
A. —Outline of mature maggot, showing position of larval pharynx, alimentary 
canal, and salivary glands. 
B. —Union of stomach and intestine of larva, showing bases of Malpighian 
tubules. 
Bx.—'The same parts in the adult. 
C. —Musculature of ventral and lateral parts of first four segments of mature 
larva, showing pharynx turned forward and the lateral pharyngeal protractor 
muscles separated from attachments on body wall as indicated by arrow on right. 
The roots of salivary duct and labial buds seen below anterior end of pharynx. 
D. —Maggots in attitudes of extension and retraction of anterior segments. 
E. —Musculature on right side and back of two consecutive segments, more 
enlarged than in C, but in corresponding position. 
EXPLANATION OF SYMBOLS 
1 , prothorax. 
2, mesothorax. 
3, metathorax. 
I, first abdominal segment. 
An, anus. 
FMcl, flexor muscle of oral hook. 
FS, frontal sacs, containing imaginal buds of antennae and compound eyes. 
Ht , heart. 
Int, intestine. 
LbB, imaginal buds of labium. 
LPMci, lateral protractor muscles of pharynx. 
Mai, Malpighian tubules. 
(E, oesophagus. 
Pvent, proventriculus. 
Phy, larval pharyngeal skeleton. 
Red, rectum. 
SalD, salivary duct. 
SalGl, salivary gland. 
TMd, transverse, intersegmental muscles. 
Vent, ventriculus. 
VMd, latero-ventral longitudinal muscles of body wall. 
VPhy, ventral wall of pharynx. 
