124 Annals Entomological Society of America [Vol.1, 



oes. oesophagus. 



ol. opening to the leg. 



om. obhque muscles of the first abdominal segment. 



op. opening to the tracheal gills. 



P. prolegs. 



sp. spiracle. ^ 



sitsp. suspensory ligament of the testis. 



s. V. seminal vesicle. 



tcs. testes. 



tr. tracheae supplying the gills. 



vd. vas deferens. 



Fig. 2. Dorsal view of the five anterior ventral ganglia. Lettering as in Figs. 

 1 and 3. 



Fig. .3. Third abdominal segment. 



lA, SA. first and third abdominal segments. 



IT, 2T, ST. first, second and third thoracic segments. 



/, //, ///. first, second and third thoracic ganglia. 



.4. B. L. nerve trunks of the thoracic ganglia. 



a, b, c. branches of nerve .4 of ganglia/. 1, 2, 3, 4*, are sub-branches 



to same nerve. 

 con. connective. 



c. r. crura cerebri. 

 /. furcae. 



Gl, G3, G4. first, third and fourth abdominal ganglia. 



H. head. 



/. lateral nerve-trunk of abdominal ganglia. 



Im. labial muscles. 



111. g. minute ganglion of the median nerve. 



m. n. median nerve. 



itjC, MjC, «3C, n^c. first to fourth nerve of the connectives. 



ol. opening to the leg. 



op. opening to the tracheal gills. 



5. c. suboesophageal commissure. 



5, g. suboesophageal ganglion. 



sn. salivary nerve. 



tcii. tendon of the labial muscles. 



tr. tracheae. 



tr. 11. tracheal nerve. 



tv. n. t transverse nerve. 



V. ventral nerve-trunk of abdominal ganglia. 



Fig. 4. Dorsal view of the head. Lettering as in Fig. 7. 



Fig. 5. Ventral view of the head. 



Fig. G. The mandibular nerve. 



Fig. 7. Lateral view of the nerves of the head. 



a, antennal nerve. 

 ao. aorta. 



ap. apodeme. 

 ar. arched nerve. 



b, b. brain or supraoesophageal ganglia. 

 cl. clypeo-labral nerve. 



con. connective. 

 cr. crura cerebri. 



d. s. salivary duct. 



c, c. simple ej^es. 



* Other numbers in these and following figures designate main branches 

 of the different nerve trunks. 



