XX EXPLANATION OF PLATES 



botryoidal tissue (yellow). The testes (white shaded with blue) show at the 

 sides protruding from beneath the alimentary canal. 



Fig. 2. Hoplophora magna (female, lateral aspect, x about 50). The chitin 

 at the side and the fatty tissue and muscles have been removed. Alimentary 

 canal pink ; caeca of the ventriculus spotted ; preventricular glands brown ; 

 supercoxal gland white ; its vesicles yellow ; expulsory vesicle, between 

 supercoxal and ovaries, grey ; ovary and oviducts white shaded with blue and 

 yellow. The genital and anal plates are open, and the genital suckers pro- 

 truding. One maxilla, white, is seen between the legs. 



Fig. 3. Tegeocranus latus (female, dorsal aspect, x about 55). Dorsal 

 exo-skeleton, fatty tissue, and muscles removed. Same colours as before. 

 Brain (between preventricular glands) blue grey. Mandibles seen from above 

 and behind, their retractor muscles cut short. The tracheae, which are present 

 in this species, are seen proceeding to their stigmata in the acetabula of the 

 legs. 



Fig. 4. Female genital organs of Cepheus tegeocranus ( x about 25), Vigt. 

 Central Ovary, oviducts with eggs, vagina, and ovipositor. 



Fig. 5. The same of Damceus geniculatus ( x about 20). The genital plates 

 and the muscles and tendons which move them, arid the genital suckers, are 

 shown. 



These two figures are reduced from the originals. 



Fig. 6. Nymph (active pupal stage) of Tegeocranus hericius ( x about 100) 

 (carrying its cast dorsal skins). 



TYROGLYPHIDJE 



Fig. 7. Hypopial (travelling) nymph of Rhizoglyphus Robini (ventral 

 aspect, x 100). 



PLATE XXI. (Facing p. 1010) 



ORIBATIDjE 



Fig. 1. Leiosoma palmicinctum ( x about 40). 



Fig. 2. Nymph of same species, fully grown ( x about 55). The central 

 ellipse with the innermost set of scales attached is the cast larval dorsal 

 abdominal skin. The other rows of scales belong to the successive nympha- 

 skins. 



Fig. 3. One of the scales more highly magnified. 



CHEYLETID^l 



Fig. 4. Rostrum and great raptorial palpi, with their appendages of Ghey- 

 letus venustissimus ( x about 150). 



MYOBIID.E 



Fig. 5. Myobia chiropteralis (female, x about 125). 



PLATE XXII. (Facing p. 1012) 



Claw of first leg of same species, being an organ for holding the hair of 

 the bat. 



GAMASID^E 



Fig. 2. Gamasus terribilis (male, x 30). A species found in moles' nests. 



ANALGIN.E 



Fig. 3. Freyana heteropus (male, x about 95, a parasite of the cormorant). 

 Fig. 4. Sarcoptes scabiei (the itch mite, x about 150, adult female). 



