igoS] Nervous System of the Larva of Corydalis 119 



There seems to be no connection between the two lateral 

 ganglia, nor are these connected with the vagus system as is 

 generally the rule in insects. They arc united to the central 

 nervous system by the nerves u and m. Nerves n are attached 

 to the ventral borders of the two halves of the brain and run 

 caudad one on either side of the recurrent nerve until emerging 

 from underneath the aorta to which they are closely joined. At 

 this point, the nerve u increases in thickness {z) and curving 

 gradually latero-ventrad, finally enters the cephalic portions of 

 the ganglion. Nerve m is attached to the ventro-lateral border 

 of the brain and extends caudad along the dorso-lateral portion 

 of the oesophagus. Near its attachment to the brain, it gives 

 off a lateral branch {%), which appears like a separate nerve of 

 the brain. Caudad, nerve m gives off three branches, the first 

 two of which join the enlarged transverse portion of nerve ti 

 (labeled z) . The third branch joins nerve p of the same s^^stem. 

 Nerve p, extending cephalad as a continuation of nerve z, inner- 

 vates the lateral parts of the pharynx, caudad of the crura cere- 

 bri. Nerve q arises from the anterior lateral part of the ganglion 

 (Ig) and extends cephalad, passing between the mandibular 

 muscles and the oesophagus, and underneath the optic, antennal 

 and mandibular nerves to the lateral portions of the mouth. 

 Nerve 5 projects caudad from the lateral ganglion, passing for 

 some distance parallel to the stomogastric nerves. It gives off 

 numerous small branches to the sides of the oesophagus. 



The Ventral Sympathetic or Superadded System (Figs. 

 I, 2, 3, 5, and 10). 



The ventral sympathetic system consists of a minute median 

 NERVE (mn.) extending caudad from each of the first eleven 

 ventral ganglia. As a rule, the median nerve gives rise to a pair 

 of lateral branches, the transverse or respiratory nerves 

 (tv. 11.) which extend laterad over of the connectives and nerves 

 of the central system. 



The median ner\'e arising from the suboesophageal ganglion 

 is comparatively short. In a few instances it has been found 

 wanting altogether, so that the transverse nerves arise directly 

 from the ganglion. These transverse nerves are united with the 

 first pair of nerves of the connectives (Mic) . 



In the thorax, the median nerves are short and give rise to 

 relatively very large transverse nerves. These extend caudo- 

 laterad over the ventral muscles and unite with the tracheal 



