PLATE 2.— Arachnida. 



Figure 



1, Acarus domesticus (cheese-mite), a, labium and mandibles; b, hair; ff, labium; i, end 



of leg. 



2. Acarus longior. 3. Anystis ruricola. a, palp ; b, mandible. 

 4. Epidermis of Epeira diadema. 5. Epidermis of a Dermanyssus. 



6. Mandibles of Epeira. 



1 . Mandibles, &c. of male Tegenaria. a, b, mandibles; c, palpi; d, maxillae; e, labium. 



8. End of leg of Epeira. a, b, hairs of the same. 



9. Lung-plates of Epeira. 



10. Spinneret of Tegenaria domestica. a, two separate spinning-tubes, the right-hand one 



from Epeira, the left-hand one from Tegenaria. 



11. Portion of cobweb of JEpeira. 12. Epidermis of Arrenurus. 



13. Arrenurus viridis, female, dorsal view, a, palp ; c, under view of male, showing round 



mouth with hood and two first joints of palpi, the coxse, two stigmata and two gra- 

 nular plates, anal orifice and penis. 



14. Atax histrionicus. a, mandible; b, palp ; c, under view, with labium, coxse, and genital 



plates. 



15. Hypopus muscarum. 16. Sarcoptes hominis, under view, female. 

 18. Psorojjtes equi, under view. 19. Ixodes Dugesii, from above. 



20. Ixodes Dugesii, anterior portion, from above, a, dorsal plate ; b, basilar piece of 



support of rostrum ; c, palpi, between which part of mandibles is visible. 



21. Ixodes Dugesii, side view of palp. 



22. Ixodes Dugesii, basilar piece from above, a, dotted lines indicating first joint of man- 



dibles (b) seen through support ; c, moveable toothed claw, 



23. Ixodes Dugesii, sixth and seventh joints of leg, with claws and caruncle. 



24. Dermanyssus avium, from beneath, a, labium of male, compressed, with palp (*) and 



mandible (t) ; b, mandible of female ; c, leg. 



25. Uropoda vegetans, a, mandible ; b, its end more magnified ; c, sixth and seventh joint 



of leg in side view. 



26. Gamasus coleoptratorum, from above, a, end of leg ; b, body from beneath ; c, man- 



dible. See Parasite. 



27. Limnochares aquatica. a, under view of labium and palpi; 6, side view of labium ; 



c, tarsus ; d, scaly plate supporting eyes ; e, two posterior coxae of one side only ; 

 f, rostrum protruded, with palpi and anterior coxae, trochanters and femora of one 



side only. 



28. Eylais extendens. a, mouth with its hood, and first joint of palps ; b, palp ; c, end of 



mandible, with hook ; d, under view of body, showing mouth, hood, and one palp, two 

 groups of anterior coxae with intervening genital orifice and two stigmata, posterior 

 coxae, anal orifice and two other stigmata. 



29. Hydrachna globula, a, under view, showing rostrum and palps, coxae, heart-shaped 



genital plate and anus ; b, mandible ; c, rostrum or labium, with a palp ; d, palp of 

 larva; e, end of leg; /, nymphs adherent to Nepa. 



30. Diplodontus scapuluris. a, labium with palp seen from beneath ; b, mandible. 



31. Bdella vulgaris, b, mandible; a, end more magnified; c, mandible of Bd. cceruUpes. 



32. Tetranychus trombidii. a, end of leg, front view, b, side view; c, palp ; d, mandible. 



33. Megamerus celer. a, labium ; b, palp ; c, mandible of Megamerus roseus. 



34. Pachygnathus velutinus. a, palp ; b, end of leg ; c, mandible. 



35. Raphignathus lapidum (?). a, labium of R. ruberrimus with palp and mandibles in situ ; 



b, mandible of same. 



36. Smaris papillosa, from above, a, mandible. 



37. Trombidium phalangii. a, palpi ; 6, mandible. 



38. Trombidium [Leptus) outumnale, from above. 39. Pteroptus vespertilionis, from above. 



40. Rhyncholophus cinereus. a, labium with a palp ; b, tarsus ; c, plume of the labium 



more magnified; d, a mandible. 



41. S cir us (Bdella) elaphus, side view. «, end of mandible. 



42. Demodex folliculorum, from beneath. 



43. Demodex folliculorum, anterior portion from above, a, palps ; b, maxillae; c, labrum ; 



d, tubercles. 



