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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



the fulcrum, passing laterad of these muscles, entering the fulcrum, 

 and extending to the labrum. These extensions constitute the innerva- 

 tion of the labrum-epipharynx. 



VENT 



Fig. 6.— Dorsal view of the brain and its nerves. 



AntNv, antennal nerve ; RtOes, retractors of oesophagus ; Ocs, oesophagus ; 

 RNv, recurrent nerve; LrFrNv, labrofrontal nerve; Ao, aorta; CA, corpus 

 allatum ; CC, corpus cardiacum ; CrD, crop duct ; Vent, ventricukis ; ONv, 

 ocellar nerve; HyGng, hypocerebral ganglion; PVent, proventriculus. 



Labial nerves (figs. 2, 3, 5, LhNv). — The large paired labial nerves 

 extend from the suboesophageal ganglion. Each immediately divides 

 into two large branches. The medial branch extends ventrally along 

 the posterior portion of the proboscis. Almost immediately it gives 

 off a small branch which, extending laterally and dorsally, innervates 



