236 THE ROYAL SOCIETY OF CANADA 



nervate the muscles and integument at this point. Branch 3 in- 

 nervates the transverse muscles which are attached near the leg, 

 terminating in these muscles beneath the main tracheal trunk, near 

 their lateral attachment. 



After giving off the nerve of the leg, the nerve NG continues 

 lateral and enlarges slightly to form a small ganglion, this ganglion 

 sends off several small branches which go chiefly to the integument. 

 One of these branches, b, runs forward to the anterior portion of the 

 segment, immediately behind the conjunctiva. It sends a number of 

 branches to the integument and these form a complicated network 

 of nerves spreading over the ventral surface of the segment. Branch 

 c. bifurcates near its origin, one branch running inward to the ventral 

 oblique muscles, and the other to the ventral integument. 



In the back of the insect, the nerve bifurcates, and both branches 

 divide profusely sending nerves to the transverse and oblique dorsal 

 muscles. 



In two of the specimens dissected a curious plexus was observed 

 joined to the nerves of the second and third thoracic ganglia at the 

 enlarged portion from which branches b and c arise. Loosely at- 

 tached to this part of the nerve was a small ganglion-like mass (fig. 2, 

 X.) from which two nerves ran towards the median line and two in 

 the opposite direction, the latter more or less united. The distribution 

 of these nerves were not thoroughly studied and needs further in- 

 vestigation. 



Nerves of the Connectives. (Figs. 1 and 2, NC.) The nerve 

 of the connective originates less than half a millimetre in front of the 

 ganglion. It travels outward and about one-third of a millimetre 

 from its origin gives off branch a which soon bifurcates, sending a 

 branch (1) forward to anastomose with the transverse nerve of the 

 sympathetic system; the other branch of a (2) travels back obliquely 

 and divides into several branches which innervate the ventral recti 

 muscles. Branch b is a minute nerve which is not always present 

 It divides into two branches which go to the ventral integument 

 Branch c originates just before the nerve reaches the tracheal trunk; i 

 runs forward, anastomoses with the transverse nerve of the ventra 

 sympathetic system and sends branches to the trachea and the longi 

 tudinal and transverse lateral muscles. 



The nerve trunk continues across the tracheal trunk passing 

 inside of it and, following the body wall, turns inward towards the 

 median line of the back. Immediately after crossing the trachea the 

 nerve gives off branch d which runs forward, connecting with the 

 transverse nerve and, continuing its course, innervates the conjunctiva 

 of the dorsum near the insertion of the recti muscles. Midway be- 



