248 THE ROYAL SOCIETY OF CANADA 



f.n. Frontal nerve. 



gl, g2. Small ganglia of the median sympathetic system. 



Labr. Labrum. 



L.G. Lateral ganglia. 



oc. Ocellary nerves. 



OE. Oesophagus. 



O.N. Optic nerve. 



p,q,r, &c, Nerves of the lateral sympathetic system. 



r.n. Recurrent nerve. 



set. Seta. 



Fig. 4. Dorsal view of the suboesophageal ganglion and its nerves. 

 Cr. Crus cerebri, 

 con. Connective. 

 L. Ventral nerve. 

 Lab. Labium. 

 Lb. Labial nerve. 

 L.G. Lateral ganglion. 

 Mand. Mandible. 

 Maxl. Maxilla. 

 Md. Mandibular nerve. 

 Mx. Maxillary nerve. 

 S.G. Suboesophageal ganglion, 

 spin. Spinneret. 



Fig. 5. Terminal ganglia and nerves of the abdomen. 



VI, VII. sixth and seventh abdominal ganglia. 

 A, B, C, D, E. Nerves of the last ganglion, 

 d.r. Dorsal recti muscles. 



e.d. Ejaculatory duct. 



l.n. Longitudinal nerve. 



o.l. Opening into last proleg. 



o.m. Oblique muscles. 



rect. Rectum. 



r.mj. Ventral recti majores. 



r.mn. Ventral recti minores. 



sp. Terminal spiracle. 



tr. Trachea. 



tr.l. Transversus lateralis. 



tr.n. Transverse nerve. 



s.v. Seminal vesicle. 



v.d. Vas deferens. 



Fig. 6. Intestinal Nerve. 



VII. Last abdominal ganglion. 



a and b. Branches of the intestinal nerve. 



E. Fifth nerve of the last ganglion. 



bl. Bladder-like enlargement of Malpighian tubules. 



in.n. Intestinal nerve. 



int. Intestine. 



m.t. Malpighian tubules. 



rect. Rectum. 



