456 THE BLOWFLIES OF NorTH AMERICA 
PLATE 42 
Eucalliphora lilaea (Walker) 
Larva 
Cephaloskeleton, second instar. 
Cephaloskeleton, third instar. 
Posterior spiracle, second instar. 
Posterior spiracle, third instar; p, peritreme. 
Calliphora coloradensis Hough 
Larva, third instar. 
2 ee 
Posterior spiracle. 
Cephaloskeleton. 
