PLATE 28. Insects. 



Figure 



1. Larva of gnat (Culex pipiens). 



2. Organs of larva of Agrion puella. , ocelli ; 6, oesophagus ; c, gizzard ; d, sto- 



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

 branchiae ; h, tracheae. 



3. Clothes-louse (Pediculus vestimenti). 



4. H&matopinus suis; 4*, leg more magnified. 



5. Philopterus (Docophorus) communis. 



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



7. Liotheum (Menopori) pallidum. 



8. Gyropus ovalis. 



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



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

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



10. Part of Pulex canis (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 marginalia, a, eyes ; b, antennae ; c, mandibles ; 



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



15. Pupa of Ephemera vulgata. a, abdominal branchiae. 



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



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



branchial plate. 



18. Lepisma saccharina. 



19. Larva of Gyrinus natator. 



20. Rectum of Mshna grandis ; 20*, portion more magnified (LJBELLULID.E). 



21. Pupa of Calopteryx virgo. 



22. End of abdomen of Libellula ferruginea. 



23. Sheep-tick (Melophagus 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. End of abdomen of Mshna grandis. 



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



31. Fat-body of Ichneumon-larva, developing from cells. 



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



