[duporte] LARVA OF SPHIDA OBLIQUA WALKER 247 



EXPLANATION OF PLATES. 



In the figures the principal nerve trunks are labelled with capitals. Unless 

 otherwise stated in the caption, small letters (a, b, c, etc.), indicate, in order, the 

 primary branches of the nerves, and figures are used, when necessary, to indicate 

 the secondary branches. Ex., The nerve of the second thoracic ganglion is labelled 

 N.G2, the first branch of this nerve is marked a and the branches of a are labelled 

 1, 2, and 3 respectively. 



Fig. 1. The caterpillar cut along the middle of the dorsum and opened, showing 

 the entire nervous system. On the left the position of the principal muscles and of the 

 main tracheal trunk of the left side is shown. 



For nerves of head and thorax see figs. 2 and 3. 



I, II, III, to VII. First to seventh abdominal ganglia. 



al.c, caudal portion of the alimentary canal. 



ant., antenna. 



d.m., diagonal muscles. 



e.d., ejaculatory duct. 



l.n., longitudinal nerves of the dorsum. 



o.n., oblique nerves. 



r. nerve innervating the retractor spiraculi. 



s. lig. suspensary ligament of the testis. 



set. seta. 



sp. spiracle. 



s. v. seminal vesicle. 



test, undeveloped gonad. 



tr. left main tracheal trunk. 



tr. lat. transversi latérales. 



v.d. vas deferens. 



v.r. maj. ventral recti majores. 



v. r. min. ventral recti minores. 

 Fig. 2. Thoracic and first abdominal ganglia and nerves. 



I. first abdominal ganglion. 



A. anterior nerve of the first thoracic and the first abdominal ganglia. 



B. posterior nerve of the first abdominal and first thoracic ganglia, 

 a, b, c, &c. first, second, third, &c. branches of the various nerves. 

 N.C., nerves of the connectives. 



l.n. longitudinal nerve of the dorsum, 

 mn. median nerve. 



Tl, T2, T3, first, second and third thoracic ganglia, 

 tr. transverse nerve. 

 S. G., suboesophageal ganglion. 

 Fig. 3. Dorsal view of the head, showing the brain and its nerves and the 

 lateral sympathetic system. 

 Ant. Antenna. 

 Ao. Aorta. 

 A.N. Antennal nerve. 

 Ar. Arched nerve. 



B. B. Brain or Supraoesophageal ganglion. 

 C.L. Clypeo-labral nerve. 

 Cr. Crus cerebri, 

 f.g. Frontal ganglion. 



