690 
J. DAVIDSON. 
Two small bands of muscles {'p.m.) extend from the salivary 
pump to the ventral rods of cliitin {v. r.). 
(d) Two bands of elevator muscles of the transverse bar 
[vi. h' .) extend from that structure in an autero-dorsal direc- 
tion, to become inserted on the epicranial region of the head, 
and two similar bands of depressor muscles {m. h.) pass from 
this bar to the post-dorsal border of the head. 
(e) Two bands of depressor muscles of the head (m. h.) are 
attached at its infra-posterior angles, and pass to the dorsal 
walls of the prothorax. 
(f) The movements of the anteimm are controlled b}' a band 
of elevator {m. o}.) and depressor [m. a.) muscles, which are 
attached to the antero-dorsal rods of chitiu, near the ends of 
the transverse bar, and pass outwards to become inserted on 
the walls of the basal article of the antennae. 
(g) Two elevator and two depressor muscles of the proboscis 
{vi. pr.) are insei’ted at the base of that structure and pass by 
the side of the thoracic ganglia to the dorsal wall of the 
thorax. 
(h) The retractor muscles of the mandibles (mb m.) are 
inserted on the internal face of the proximal ends of the man- 
dibles, and pass through the head to become attached to the 
antero-dorsal rods of chitin of each side, near their origin 
from the transverse bar. The protractor muscles (ra.m.) are 
attached to the antero-lateral walls of the frons, and pass 
upwai'ds to become inserted along the base of the mandibular 
chitinous rods. 
(i) The retractor muscles of the maxillae (mb mx.) are inserted 
at the proximal end of the maxillae, and pass beneath the 
mandibular retractors to become attached to the antero- 
ventral rods of chitin, near the transverse bar. 
'The protractor muscles (m. mx.) are attached to the proximal 
ends of the maxillae, and pass ventrally to the antero-ventral 
walls of the frons. 
(3) The Musculature of the Ambulatory Appen- 
dages. — Two stout flexor muscles, which have their origin at 
the postero-dox’sal margin of the mesothorax, are inserted on 
