
1905. ] Anatomy of the Tsetse-fly (Glossina palpalis). 533 




y.msth.n 
v.mtth.n 
d.mtth.n 



x75 
Fig. 1.—General Sketch of the Nervous System, dorsal view. The top of the head is pushed 
forward and downward as far as possible, to show the brain. A portion of the 
cesophagus and the salivary ducts are also represented, the salivary gland being sup- 
posed to be turned outwards from the abdomen and cut off near the origin of the ducts. 
All lettering relating to the nervous system has been placed on the right of the figure, 
that referring to other parts on the left. H., head; 7h., thorax ; I—VII, the segments 
of the abdomen ; Oc., ocelli; #., eyes; @s., cesophagus (cut off); S. D., S. D., salivary 
duct ; W., origin of wings; Hlz., halter; S. G., salivary gland ; Oc. n., ocellar nerve: 
S. O. G., right cerebral ganglion ; Op. l., right optic lobe ; Cn., connectives ; Cn. n., nerve 
from the connective forming’a plexus with : d. pth. n., dorsal prothoracic nerve; v. pth. n., 
ventral prothoracic nerve ; d. msth. n., v. msth. n., dorsal and ventral mesothoracic nerves ; 
Th. c., thoracic ganglion complex; d. mith. n., v. mith. n., dorsal and ventral meta- 
thoracic nerves ; p. abd. n., paired abdominal nerve ; az. abd. n., azygos abdominal nerve ; 
d. az. n., dorsal branch of the azygos nerve; v. az. ., ventral branch of the azygos nerve 
(genital nerve) ; pl., plexus formed by the genital nerve; p. n., nerve to penis. 
