PLATE 34.— Insects. 



Figure 

 1. Gizzard of cricket (Acheta domestica) . 



2 a. Under membrane of elytrum of cockchafer (Melolontha vulgaris) ; 26, separate 

 hair or spiniform papilla (Elytra). 



3. Scale of Lepisma saccharina, in liquid, showing air-bubbles imprisoned by the 



longitudinal ridges. 



4. Hind leg of neuter honey-bee {Apis mellifica), with pollen-brushes on the first 



joint of tarsus, a; c, tibia; d, femur; e, trochanter. 4 6, outside of tibia 

 hollowed out. 



5. Leg of middle pair of Gyrinvs natator. a, tarsus; o, tibia; d, femur; e, trochanter. 



6. Anterior leg of male Dytiscus marginalis. a, tarsus, the first three joints with 



the suckers ; 6, one of the smaller ones more magnified ; c, tibia. 



7. Leg of fly (Musca domestica). a, tarsus ; c, tibia ; d, femur ; e, trochanter. 



7 6, ear of cricket. 



8. Tarsal pulvillus of blow-fly, with hair-like suckers. 



9. One of the hair-like suckers of the same, more magnified. 



10. Anterior wing of male cricket (Acheta domestica). a, drum ; 6, file (fig. 12, the 



file more magnified). 



11. Anterior wing of humble-bee (Bombus terrestris). n, fold over which the hooks 



of the posterior wing play. (See Insects, wings, and Wings.) 



12. File of cricket (compare fig. 10, 6). 



13. Costal nerve of hind wing of humble-bee (Bombus terrestris), with the hooks 



(See Insects, ivings.) 



14. Sting and poison-apparatus of mason bee (Anthophora retusa). a, 6, sheath of 



sting ; c, reservoir ; d, duct ; e, f, secretory organs. 



15. Single sting of wasp (Vespa vulgaris). 



16. Spinning-organs of silkworm (Bombyx mori). 



17. Trachea of a caterpillar; lower part of the branch containing air. 



18. Internal reproductive organs of male mole-cricket (Gryllotalpa vulgaris), a, 



testes ; 6, vasa deferentia ; c, c', prostate (blind tubes) ; d, root of penis, with 

 caeca (Cowper's glands) at the upper part. 



19. Female organs of the same, a, a, ovaries ; 6, 6, oviducts ; c, receptacle of 



semen (blind sac), the very slender tube of which, c, opens into the vagina d. 



20. Battledore scale of Polyommatus argiolus, dry ; 20 a, a portion immersed in 



water, and more magnified. 



21. A scale of the same seen in Canada balsam. 



22. Scale from the wing of the gnat (Culex pipiens). 



23 a. Scale from the wing of male Pontia rupee, dry ; 23 6, portion of wing of the 

 same, showing the attachments of the two kinds of scales, a and 6. 



24. Scale from wing of male Pontia brassicce, dry. 



25. Scale from underside of wing of clothes-moth (Tinea pellionella). 



26. Portion of wing of Pontia brassier, dry, showing the imbricated arrangement 



of the scales, and the wrinkling of the epidermis at their insertions. 



27. Hair-like scales from clothes-moth, dry. 



28 a. Scale from wing of Lasiocampa quercus, dry ; 28 6, upper portion of the same, 

 more magnified, dry. 



29. Scale from wing of Papilio Paris, dry. 



30. Scale from larva of Attagenus pellio, dry. 



31. Portion of the above, more magnified. 



32. End of one of the posterior legs of the larva of a S2>hin<v. 



33. Anterior leg of the same. 



31. Spiracle of Dytiscus marginalis, with one of the marginal processes more mag- 

 nified. 

 35. Portion of outer membrane of the ovum of the blow-fly (Musca vomitoria). 



