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te aw Pe 
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Trt BLOWFLIES oF NortH AMERICA 
PLATE 35 
Callitroga macellaria (Fabricius) 
Larva, first instar. Cephaloskeleton. 
Larva, second instar 
Cephaloskeleton. 
Posterior spiracle. 
Larva, third instar 
Mature larva; left lateral view, sp, spines, asp, anterior spiracle, ana, 
anal area. 
Anal area; psp. posterior spiracle, 7. inner tubercle, m, median tubercle, 
0, outer tubercle, ap, anal protuberance, at, anal tubercle, pc, pos- 
terior cavity. 
Posterior spiracle; b, button, p, peritreme. 
Cephaloskeleton; Isc, labial sclerite, Ir, longitudinal ridges, dc, dorsal 
cornua, vc, ventral cornua. 
