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Anatomy of Epidiaspis Piricola. 
EXPLANATION OF FIGURES. 
PLATE XII. ; 
Pygidium of adult female, dorsal surface with circumgenital orifice and 
glands showing through. 
Respiratory system of female insect, showing two pairs of spiracles. 
Glandular spine, used in spinning the shell. (cross section shown in 
Fig. 18-e). 
Nervous system. a. Circumoesophageal commissures; b. brain; c. 
thoracic ganglion. 
Cross section of segments. a. chitin; b. muscle; c. muscle attachment. 
Spiracle. a. opening; b. wax producing spinnerets; c. tracheal tubes. 
PLATE XIII. 
Sagittal-longitudinal section of adult female. a. stomach; b. malpighian 
tubules; c. rectum; d. vagina; e. ovarioles; f. thoracic ganglion; 
g. cephalic ganglion; h. salivary glands; i. sete (rostral); j. setal 
pouch. 
Digestive tract. a. stomach; b. malpighian tubules; c. intestine; 
d. rectum; e. attachment filaments. 
Characteristic muscle structure found under chitinous covering. 
Mouth-parts and accessories. a. arcus superior; b. arcus inferior; 
d. valvular pump; e. salivary gland; g. costa inferior; h. costa super- 
ior; i. oesophagus (i. oesophagus drawn to one side); j. salivary ducts; 
k. setae; m. muscle. 
Longitudinal cross section of mouth-parts. a. sete; b. muscle; c. common 
chamber at base of sete; the union point of oesophagus and duct 
leading from pump; d. salivary duct; e. oesophagus; f. muscles attached 
to base of oesophagus and to the body wall. 
Diagrammatic cross section of pump showing inlet and outlet. 
i. inlet; o. outlet. 
PLATE XIV. 
Ovaries, dorsal view. a. ovarioles; b. seminal receptacle; c. vagina; 
d. vulva. 
Ovaries, lateral view. (lettering the same as Fig. 14). 
Seminal receptacle. a. sperm cells. 
Sagittal section of gravid female cutting through caudo and cephalo- 
lateral circumgenital glands. a. wax glands with neuclei; b. sup- 
porting cells with neuclei; c. gland ducts; d. grouped gland orifices. 
Cross section of spinning glands that form the shell. d. dorsal spinneret 
with characteristic silk gland; e. spine-like marginal spinneret; 
f. silk gland; g. gland found in connection with the silk gland and 
supposed to secrete a cement-like fluid. 
Normal position of the vulva and circumgenital glands of adult female. 
a. vulva; b. anus. 
Shift in position of the circumgenital glands of the adult female during 
egg laying. 
Position of adult female during egg laying. a. normal position indicated 
by dotted line; b. position during the depositing of the eggs. 
