50 MR 
Fig. 17. Tracheae of ilium of Tenthredo, x 125, 
Fig. 18. Tracheae of Malpighian vessel of Tipula, x 125. 
Fig. 19. Tracheae of Malpighian vessel of Lib ellula, x30. 
Plate III. 
Fig. 1 . Tracheae from ovary of Aphrophora, x 30. 
Fig. 2. Tracheae from ovary of Musca, x 125. 
Fig. 3. Tracheae from ovary of Chrysopa, x 50. 
Fig. 4. Tracheae from ovary of Tipula, x 125. 
Fig. 5. Tracheae from ovary of Tipula, x 125. 
Fig. 6. Tracheae from ovary of Locust a, x 125. 
Tracheae from ovary of Ophion, x 30. 
Tracheae from ovary of Hipp arc hia, x 125. 
Tracheae from ovary of Forficula, x 125. 
Fig. 7. Tracheae from ovary o\ 
Fig. 8. Tracheae from ovary of 
Fig. 9. Tracheae from ovary oi 
Fig. 10. Tracheae from ovary of Necrophorus, x 125. 
Fig, 11. Tracheae from ovary of Pentatoma, x 30. 
Fig. 12. Tracheae from ovary of Acheta, x 30. 
Fig 
Necrophorus, xl25. 
Fig. 14. Tracheae from testis of Bombus, x 125. 
Fig. 15. Tracheae from egg-canal of Bom bus, x 125. 
Fig. 16. Tracheae from testis of Melolontha, x 125. 
Fig. 17. Tracheae from ductus ejaculatorius of Pent at 1 
Fig. 18. Tracheae from testis of Musca, x 125. 
Fig. 19, Tracheae from testis of Er is talis, x 125. 
Fig. 20. Tracheae from epididymis of Bom bus, x 125. 
Fig. 21. Tracheae on a Malpighian vessel of Lib ellula. 
x 125 
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- Tracheae from the rectum of Forficula, x 30. 
Fi 
Mamestrus x 12.5. 
Fig. 9. Tracheae from the fatty tissue of Pentatoma, x 125. 
Fig. 10. Tracheae from the fatty tissue of Cijnips 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 Ache, 
Fig. 14. Trachea? from the thoracic muscles of Vespa, x 125. 
Fig. 15. Tracheae from the abdominal 
Fig. 16. Tracheae from the thoracic n 
Fig. 17. Tracheae from the muscles o 
x 125. 
muscles 
x 125. 
Er 
Fig. 18. Tracheae from 
x 125. 
* 
been found impossible to make the ends 
