I 12 



MELANDER. 



nervous system is nearly similar to that of Solicri, consisting 

 of three large thoracic ganglia and seven smaller abdominal gan- 

 glia connected by the double ventral cord. The fifth segment 

 is, as has been noticed in Solieri and Uhrichi, destitute of a gang- 

 lion, the ventral cord between the fourth and fifth ganglia being 

 longer than between the others. But in our species the last 

 ganglion (seventh abdominal) is crowded forward, though still 

 remaining larger than the other ganglia of the abdomen. Its 

 position is above the seventh sternite and contiguous with the 

 ganglion in front. In the two species before compared the last 

 ganglion is connected with the sixth by a commissure and is 

 placed in the eighth segment. Each of the ganglia send side 

 branches into the viscera, while the last terminates in a pair ot 

 nerves interwoven with the efferent sexual ducts. 



The visceral system is somewhat different from that of Blatta. 



a 



FlG. 5. a, lateral; b, dorsal view of the cephalic nervous system; br., brain; 

 f. g., frontal ganglion; . an., cesophageal commissure; off., olfactory lobe; opt., 

 optic lobe ; phar., pharynx ; so:, g., subcesophageal ganglion. 



It consists of an unpaired triangular frontal ganglion of rather 

 large size, connected laterally by stout commissures with the 

 anterior lobes of the brain. The lower portion of this ganglion 

 ends laterally in nerves extending obliquely forward along the 

 oesophagus. The frontal ganglion ends posteriorly in a long 

 slender nerve lying immediately above the coat of circular mus- 

 cles of the alimentary tract, and enlarged as two ganglia over the 



