50 MR. LUBBOCK ON THE DISTRIBUTION OF THE TRACHE.^ IN INSECTS. 



Fig. 17. Trachcce of ilium of Tenthredo, x 125. 



Fig. 18. Trachese of Malpighian vessel of Tipula, x 125. 



Fig. 19. Trachcce of Malpighian vessel of Libelhda, x30. 



Plate III. 



Fig. 1 . Tracheae from ovary of Aphrophora, x 30. 



Fig. 2. Tracheae from ovary oi Musca, x 125. 



Fig. 3. Tracheae from ovary of Chrysopa, x 50. 



Fig. 4. TrachccE from ovary of Tipula, x 125. 



Fig. 5. Tracheae from ovary of Tipula, x 125. 



Fig. 6. Trachece from ovary of Zoras/a, x 125. 



Fig. 7- Trachete from ovary of Ophion, x30. 



Fig. 8. Tracheae from ovary of Hipparchia, x 125. 



Fig. 9. Tracheae from ovary of Forficula, x 125. 



Fig. 10. Tracheae from ovary of Necrophorus, x 125. 



Fig. 11. Tracheae from ovary of Pent at oma, x 30. 



Fig. 12. TrachccE from ovary of Acheta, x 30. 



Fig. 13. Tracheae from testis of Necropliorus, x 125. 



Fig. 14. Tracheae from testis of Bombus, x 125. 



Fig. 15. Tracheae from egg-canal of -Boniiws, x 125. 



Fig. 16. Tracheae from testis of Melolontha, x 125. 



Fig. 17- Tracheae from ductus ejaculatorius of Pent at oma, x 125. 



Fig. 18. Tracheae from testis of Musca, x 125. 



Fig. 19. Tracheae from testis of Eris talis, x 125. 



Fig. 20. Tracheae from epididymis of Bombus, x 125. 



Fig. 21. Tracheffi on a Malpighian vessel of Lib ellula. 



Plate IV. 



Fig. 1. Tracheae from the rectum of Musca, x 125. 



Fig. 2. Tracheae from the rectum of Bombus, x 125. 



Fig. 3. Tracheae from the rectum of Pentatoma, x 125. 



Fig. 4. Tracheae from the rectum of Chrysopa, x 125. 



Fig. 5. Tracheae from the rectum of Vespa, x 125. 



Fig. 6. Tracheae from the rectum of Acheta, x 30. 



Fig. 7- Tracheee from the rectum of Forficula, x 30. 



Fig. 8. Tracheae from the fatty tissue of the larva of Mamestra, x 125. 



Fig. 9. Tracheae from the fatty tissue of Pentatoma, x 125. 



Fig. 10. Tracheae from the fatty tissue of Cynips lignicola, x 30. 



Fig. 11. Tracheae from the Malpighian vessel of Musca, x 125. 



Fig. 12. Tracheae from the thoracic muscles of Panorpa, x 125. 



Fig. 13. Tracheae from the thoracic muscles of the larva of Acheta, x 125. 



Fig. 14. Tracheae from the thoracic muscles of Vespa, x 125. 



Fig. 15. Trachete from the abdominal muscles of the larva of Mamestra, x 125. 



Fig. 16. Tracheae from the thoracic muscles of Eris talis, x 125. 



Fig. 17. Tracheae from the muscles of the larva of Lasiocampa, x 125. 



Fig. 18. Tracheae from the thoracic muscles of Panorpa, x 125. 



*;,,* It has been found impossible to make the ends of the trachese as delicate as they ought to be in proportion. 



