EXPLANATIONS OF THE PLATES. 



LETTERING USED. 



A. Anus. 



be. Bursa copulatrix. 



bd. Passage from bursa copulatrix to receptaculuni seminis. 

 br. Brain. 

 c. Cuticle. 



C88. Caeca of ventriculus. 

 car. Caruncle. 



cb. Chitinised bar below ductus ejaculatorius. 



cc. Chitinised cuticle, 

 co. Colon. 



ex. Coxa. 



de. Ductus ejaculatorius. 

 dec. Chamber of the ductus ejaculatorius. 



ec. Ectostracum. 



ed. Endostracum (Hypoderm). 

 ep. Epiostracum (Epidermis). 



epm. Epimeron. 



ex. Balls of wholly, or partly, digested food. 

 /. Femur. 

 fj. Flexible joint. 

 fp. Flagella of the palpus (in Histiostoma). 



g. Genual (middle joint of leg). 

 gac. Chambered accessory gland of <$ . 

 gar. Receptacular accessory gland of $ . 

 ge. External genital aperture. 

 gel. Labia of external genital aperture. 

 gso. Supra-cesophageal ganglion (upper part of brain). 

 gsu. Subo3sophageal ganglion (under part of brain). 

 la. Outer labia of vulva. 

 le. Inner labia of the vulva. 

 li. Lingua. 

 m. Mouth. 



me. Constrictor muscles. 

 md. Mandibles. 



mda. Divaricator muscles of the labia ani. 

 mdc. Depressor muscles of the coxa. 

 mdd. Divaricator muscles of the mandibles. 

 mdf. Fixed arm of the chela of the mandible. 

 mdni. Moveable arm of the chela of the mandible. 

 mdo. Occlusor muscles of the mandibles. 

 mdr. Retractor muscles of the mandibles. 

 mdv. Dorso-ventral muscles. 



