26 0. HERBERT HURST. 



In conclusion, I would express my best thanks, _^rs%, to the Council 

 of the Owens College, through whose generosity I have been able to 

 leave my work in Manchester ; and, secondly, to my honoured 

 teacher, Herr Geheimrath Professor Dr. Leuckart, to whom I am 

 indebted for many kind hints, especially as to the literature of the 

 subject, and also for the loan of very numerous books and papers. 



I subjoin a list of the books and papers to which I have referred 

 in the foregoing dissertation : — 

 1. SwAMMERDAM. — " Bibel der Natur." 



2. Easchke. — " Die larve von Culex nemorosus." Berlin, 1887. 



3. A. M. Mayer. — " Eesearches in Acoustics," "American Journal 



of Science," 1874. 



4. Landois. — " Die Ton- und Stimm-Apparate der Insecten," 



" Zeitsch. f. wiss. Zool.," xvii., 1867. 



5. DiMMOCK. — " Mouth-parts of some Diptera." Boston, 1881. 



6. Palmen. — " Zur Morphologic des Tracheensystems." Helsing- 



fors, 1877. 



7. Huxley. — "Anatomy of Invertebrated Animals." 



8. MiALL and Denny. — " The Life-history and Structure of the 



Cockroach." London, 1886. 



9. Chun. — "Bau, etc., der Rectal-driisen bei den Insekten." 



Frankfurt a/M., 1875. 



10. Graber. — "Ueber den propulsatorischen Apparat der Insekten," 



" Arch. f. Mikr. Anat.," ix., 1873. 



11. Patten.— "The Eyes of Molluscs and Arthropods," "Mitth. 



aus d. zool. Stat, zu Neapel," 1886. 



12. KowALEVSKY. — " Ein Beitrag zur Kenntnis der Excretions- 



Organe," "Biolog. Central-blatt," ix., 1889. 



13. Johnston.---" Auditory Apparatus of the Culex Mosquito," 



" Journ. Microscopical Science" (old series), vol. iii., 1855. 



