PLATE XV. 



Pig. 50. — Longitudinal section of the head, a, back of beak lying 

 against the sternum; 6, supraoesophagal ganglion, or upper brain; e, 

 suboesophagal ganglion, or lower brain; r, support rod; p, pumping 

 muscles, or salivary ejaculator; k, duct leading from salivary glands; o, 

 duct from salivary ejaculator (p) to oesophagus; f, floor of mouth; v, 

 muscles; j, muscles; x, maxillary seta; g, epipharynx; I, labrum; n, 

 muscles governing pharynx; u, muscles governing pharynx; z, clypeus 

 (ventral face) ; y, clypeus (cephalic face) ; t, m, muscles supporting 

 clypeus; h, hypopharynx. 



Fig. 53. — Ventral aspect of the tip of the female abdomen, v, ventral 

 plate; g, supra-anal plate; r, egg guides; e, claspers; o, oviducts; y, anal 

 plates. 



Fig. 54. — Lateral aspect of the tip of the female adbomen. g, supra- 

 anal plates; if, anal plates; gs, subgenital plates; r, claspers; e, egg 

 guides; v, last ventral segment of the abdomen. 



