PLATE 6 
Rhagoletis pomonella 
A. —Pupa in early part of second or phanerocephalic stage. Head everted, 
larval tracheal linings still retained. 
B. —Pupal alimentary canal and salivary glands at period shown in A. (Com¬ 
pare with Plate 4, A.) 
C. —Second phase of phanerocephalic pupa, the final pupal form, ventral 
aspect. 
D. —Same as C, lateral aspect. 
E. —Cast linings of dorsal tracheal trunks of larva connected with stigmatic 
ehambers of posterior spiracles of puparium, showing usual arrangement against 
inner wall of molted prepupal cuticle enclosing the pupa. 
F. —Inner surface of dorsal part of puparial cuticle through first three seg¬ 
ments, and prepupal cuticular envelope of pupa, showing cast larval tracheal 
tubes still connected with anterior larval spiracles of puparium, and opening into 
pupal chamber by ruptures in second segment, thus establishing air passages to 
the pupa. 
G. —Median, lengthwise section of puparium, and inner pupal envelope formed 
of cuticle of prepupal instar, pupa removed, showing cast linings of dorsal tracheal 
trunk connected with anterior and posterior larval spiracles of puparium, lin¬ 
ings of lateral trunks and branches connected with lateral spiracles, and intima 
of pharynx and intestine connected with pupal envelopes at mouth and anus. 
EXPLANATION OF SYMBOLS 
An, anus. 
Ant, antennal lobes. 
ASp, anterior larval spiracle. 
E, compound eye. 
Int, intestine. 
Mai, Malpighian tubules. 
Mth, larval mouth. 
N 2j mesonotum. 
Phy, larval pharyngeal skeleton. 
pm, puparium. 
ppu, cuticle of prepupal larva. 
PSp, posterior larval spiracle. 
Prb, proboscis. 
Pt, ptilinum. 
PuSp, pupal dorsal spiracle of pronotum. 
Red, rectum. 
SalGl, salivary gland. 
Sp, lateral spiracles, the adult system, connected with lower longitudinal 
tracheal trunk. 
SpC, stigmatic chamber. 
tra, tracheal linings of preceding instar. 
u, subocular lobe of pupa. 
Vent, ventriculus. 
W 2> wing; W 3 , haltere. 
