NO. 7 



THE INSECT CRANIUM SNODGRASS 



23 



(C) and Haenmtopinus (D) there is no essential difference except 

 in the relative length of the head and the presence of the interantennal 

 band of weak cuticle in the former. Yet Stojanovich calls the arms 



frapt->. 



,dlcb 



Fig. 7. — Anoplura and Haemutomysus. 



A, Pediculits humanus corporis Deg., head of male nymph just before ecdysis. 

 B, same, exuviae of head, ventral ; frontal apotome turned downward between 

 points X, X, parietal lobes with eyes and antennae spread laterally. C, same, 

 head of adult (from Stojanovich, 1945), showing distribution of muscle attach- 

 ments. D, Haematopinus suis (L.), head of adult (from Stojanovich, 1945), 

 showing muscle attachments. E, Haematomycus elephantis Piaget, exuviae of 

 first nymphal instar (from Weber, 1939). 



of the cleavage line in Pedicidus "postfrontal sutures," and those of 

 Haematopinus the "clypeo frontal suture." In the first, the facial area 

 embraced by the arms is designated the "antennal segment," in the 

 second the "clypeus." To reconcile the muscle attachments with this 

 interpretation of the skeletal areas Stojanovich makes the statement 



