PLATE 28.-Insects. 



Figure 



1. harva of gnat (Culex pipiens). 



2. Organs of larva of Agrion pueUa. a, ocelli ; b, oesophagus ; c, gizzard ; d, sto- 



mach ; e, Malpighian vessels truncated ; /j intestine and rectum ; g, caudal 

 branchiae ; h, tracheae. 



3. Clothes-louse {Pediculus vestimenti) . 



4. HcematopiriKS suis ; 4*, leg more magnified. 



5. Philopterus {Docophorus) communis. 



6. Trichodectes latus ; 6*, labium and labial palpi. 



7. Liotheum (Menopon) pallidum. 



8. Gyropus ovalis. 



9. Pulex felis (flea of cat), female, a, spiracles ; b, head ; c, thorax ; d, maxil- 



lary palpi ; e, setae ; f, epimera ; g, coxae ; k, trochanter ; i, femur ; k, tibia ; 

 I, tarsus ; x pygidium ; 9 a, separate antenna. 



10. Part of Pulex cams (dog's flea), a, protothoracic setae ; b, cephalic setae. 



11. Head of flea from common bat (Pulex). 



12. Antenna of flea from pigeon (Pulex). 



13. Posterior end of abdomen of pigeon's flea; male (Pulex). 



14. Head of larva of Dytiscus marginalis, a, eyes ; &, antennae ; e, mandibles ; 



d, maxillae ; e, maxillary palpi ; /, labial palpi. 



1.5. Pupa oi Ephemera vulgata. a, abdominal branchiae. 



16. Larva of Acilius sidcatus (formerly Dytiscus sulc). 



17. Pupa of Agrion puella; the ocelli are omitted (Libellulid.^) ; 17*, caudal 



branchial plate. 



18. Lejnsma saccharina. \ 



19. Larva of Gyrinus natator. 



20. Rectum of Mshna grandis \ 20*, portion more magnified (Ltbellulid^). 



21. Pupa of Calopteryx virgo. 



22. ^ndi of ahAom^w of Libellulaferrvginea. 



23. Sheep-tick {MelopTiagus ovinus). 



24. Flea from the mole (Pulex). 



25. Head of a Scolopendra (one of the Myriapoda). 



26. Head of a Lithobius (one of the Myriapoda). 



27. Fibres of silk-worm's silk. 



28. Three lobes of the fatty body of the larva (caterpillar) of Saturnia carpini. 



29. ^wdi of ahdiOmen of JEshna grandis. 



30. (between 2 and 3), Epidermis of cricket {Acheta doiriestica). 



31. Fat-body of Ichneumon-\a\y a, developing from cells. 



32. Egg of aquatic insect (?), common in bog-water. 



