PLATE 6.— Arachnida. 



Figure 



1. Acarus (Tyroglyphm) domesticus (cheese-mite), a, labium and mandibles ; b, hair ; 



g, labium ; i, end of leg. 



2. Acarus longior. 



3. Anystis ruricola. a, palp ; b, mandible of. (See PI. 50. fig. 4.) 



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



6. Mandibles of Epeira. 



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



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



9. Lung-plates of Epeira ; 9 b, piece more magnified. 



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 Epeira. 12. Epidermis of Arrenurws. 



13. Arrenia-ns viridis, female, dorsal view, a, palp ; <?, under view of male, showing round 



mouth with hood and first two 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 scabiei, under view, female. 

 18. Psoroptes 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, movable 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. Vropoda 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, mandible. 



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



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

 /, rostrum protruded, with palpi and anterior coxse, trochanters and femora of one 

 side only. 



28. Eglais 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 coxse with intervening genital orifice and two stigmata, posterior 

 coxse, anal orifice, and two other stigmata. 



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



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

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



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



31. Bdella longicornis. b, mandible ; a, end, more magnified ; e, mandible of Bd. ccerulipes. 



32. Tetranychus glaber. 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. Tetranychus cristatus, vel lapidum. a, labium of Raphignathus ruberrimus with palp 



and mandibles in situ ; b, mandible of same. 



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



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



38. Trombidium (Leptus) autumnale, from above. 39. Pteroptus vesperfilionis, from above. 

 40. Trombidium cinereum. a, labium with a palp ; b, tarsus ; c, plume of the labium 



more magnified ; d, a mandible. 



42. Demodex folliculorum, from beneath. 



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



d, tubercles. 



44. Scirus (Bdella) cltyihus, side view, a, end of mandible. 



