204 Annals Entomological Society of America [Vol.1, 



EXPLANATION OF PLATE XII. 

 All figures were drawn with a camera lucida. 



Fig. 1. Dorsal view of reproductive organs: t, testis; vd, vas deferens; 

 sv, seminal vesicle; o, entrance of seminal vesicle into glandula mucosa; gni, 

 glandula mucosa; ed, ejaculatory duct. (X 16). 



Fig. 2. Tracheae which hold the testis in its lateral position in the abdo- 

 men: 5s, fifth abdominal stigma; 6s, sixth abdominal spiracle; tr, trachea, 

 which gives off a number of branches to the anterior end of the testis; t, testis; 

 vd, vas deferens. (Xl7). 



Fig. 3. Section through seminal vesicle and glandula mucosa, showing the 

 opening of the former into the latter: nc, nuclei changing their direction; sv, 

 seminal vesicle; p, peritoneal membrane; o, opening of the seminal vesicle into 

 the glandula mucosa; c. cellular change; bm, branching muscles within the folds; 

 cm, circular muscles. (X60). 



Fig. 4. Exceedingly long cells of glandula mucosa : gl, swollen end of cell 

 in the earh^ process of forming. a secretory globule; g, droplet of secretion; n, 

 nucleus. (X650). 



Fig. o. Secretorj' processes: A, pyriform secretory process in direct con- 

 tinuity with the protoplasm of the cell from which it has originated; B, globule 

 Avhich has become free by strangulation. (X1300). 



Fig. G. Longitudinal section throughout the middle of the seminal vesicle: 

 cm, circular muscles; bm, branching muscles; vep, nucleus. (X650). 



