PLATE 26.--Insects. 



Figure 



1. Head of Blatta orientalis, from before, a, antennae, cut off; b, epicranium; c, eyes; 



d, clypeus ; e, labrum ; g, maxillse ; h, maxillary palpi ; k, labial palpi. 



2. Head of Blatta orientalis, under portion, g, stipes, h, palp of maxilla; i, palpiger, 



k, palp, I, mentum, * paraglossa of labium ; m, submentum and gula ; X occiput. 



3. Head of Hydrous piceus, under view, a, antennae ; c, eye ; e, labrum ; /, mandible ; 



g, maxilla ; h, maxillary palp ; i, ligula ; k, labial palp ; /, mentum ; m, submentum ; 

 n, gula; X occiput. 



4. OceWi o{ Agrionfulvipes. 



5. Portions of cornea of eye of Acheta domestica. a, with hexagonal, h, with quadran- 



gular facets. 



6. Perpendicular section of part of eye of Libellula. c, cornea; b, anterior convex margin'; 



d, anterior chamber ; /, crystalline lens ; g, choroid. 



7. Antenna, setaceous (Achetidse, &c.). 



8. Antenna, ensiform (Locustidae). 



9. Antenna, filiform (Carabidae). 



10. Antenna, moniliforni (Tenebrionidae, &c.). a, scapus ; b, pedicella; c, clavola. 



11. Antenna, serrated (Elateridae). 12. Antenna, imbricated (Priouidae). 



13. Antenna, pectinated (Lampyridae). 14. Antenna, bipectinated (Bombycidae). 



15. Antenna, flabellate (Elateridae). 



16. Antenna, clavate (Coleoptera). 



17. Antenna, capitate (Coleoptera). 



18. Antenna, lamellate and perfoliate (Melolontha). a, scapus ; b, pedicella ; c, clavola ; 



d, lamellae. 



19. Antenna of Globaria. a, scapus; b, pedicella; c, clavola; d, capitulum. 



20. Antenna, plumose (Muscidae). 



21. Antenna, plumose {Culex pipiens, male). 



22. Trophi oi Blatta orientalis. a, labrum; bb, mandibles; c, maxillae (f lacinia, * galea) ; 



d, internal tongue ; e, labium. 



23. Tongue of cricket {Acheta domestica). a, b, c, parts of a fibre more magnified. 



24. Head of mason-bee {Anthophora retusa), front view, a, antenna; b, ocelli; c, eye; 



d, clypeus ; e, labrum ; /, mandible ; g, maxilla ; h, its palp ; i, palpiger or part of 

 the ligula ; k, labial palp ; * ligula, commonly called the tongue ; x, paraglossae. 



25. Maxillae and labium of honey-bee [Apis mellijica) ; g, maxilla ; hy its paljj ; k, labial 



palp ; I, mentum ; * ligula, commonly called the tongue. 



26. Trophi of water-scorpion {Nepa cinerea). * lingua; /, mandibles; g, maxilla; i, 



labium, 



27. Trophi of bug {Cimex lectularius). a, mandibles united; 6, maxillae; the median organ 



is the labium. 



28. Antlia of red admirable butterfly {Vanessa atalanta). a, separate papilla; b, end of 



antlia extended ; c, transverse section of antlia near its root ; * % tracheae, f tube ; 

 d, entire organ with two maxillae slightly separated at the end ; e, tooth ; /, section 

 near the end, showing the position of the papillae *, and the canal X . 



29. Proboscis of the blow-fly {Musca vomit oria). a, maxillary palpi ; c, lobes of labium ; 



29 a, portion of margin more magnified. 



30. Trophi of female gnat {Culex jnpiens). a, antennae ; e, labrum ; //, mandibles; g g, 



maxillae ; d, tongue ; i, labium. 



31. Setae of the same, more magnified, d, tongue; e, labrum; /, mandible ; g, maxilla. 



32. Trophi of flea {Pulex irritans). d, labrum;/, mandibles or lancets; g, maxilla; h, 



maxillary palpi ; k, sheaths corresponding to labial palpi. 



33. Trophi of flea more magnified, d, labrum ; /, end of mandible ; k, sheath ; I, labium ; 



m, mentum. 



