April, 1904.] Galls and Insects Producing Them. 133 



order of insect. This verj' complex development is due to an 

 earl}- acquirement of the gall-making habit or to more rapid evo- 

 lutionary development as a result of the deposition of the egg 

 below the surface. 



The greater part of the work connected with Part IX of this 

 series was conducted at the lyake lyaboratory of the Ohio State 

 University at Sandusky, Ohio, and I am very much indebted to 

 the Director, Professor Herbert Osborn, for valuable assistance. 

 I also wish to express ni}' thanks to the many friends who have 

 collected material and otherwise aided in these studies. 



This series of papers will be presented to the Faculty of the College of 

 Arts, Philosophy and Science, of the Ohio State University, as the thesis 

 requirement for the degree of Doctor of Philosophy, June, 1904. 



IvITERATURE. 

 Continuous with the bibliography published with Parts I and II. 



24. Adler, Dr. H. " Lege-Apparat und Eierlegen der Gall- 

 wespen." Deutsche Entomologische Zeitschrift XXI. 1877, 

 Heft II. 



25. Beyerinck, Dr. M. W. " Beobachtungen uber die ersten 

 entwicklungsphasen einiger Cynipidengallen." Veroffentlicht 

 durch die Konigliche Akademie der Wissenschaften zu Amster- 

 dam, 1882. 



26. Beijerinck, M. W. " Bydrage tot de Morphologic der 

 Plantegallen," 1877. 



27. Beijerinck, M. W. " De Gal van Cecidomyia aan Poa 

 nemoralis," Overgedrukt uit het Maandblad voor Natuurwet- 

 enschatten, 1884, No. 5. 



28. Beijerinck, M. W. " Ueber Gallbildung und Genera- 

 tionswechsel bei Cynips calicis und uber die Circulansgalle," 

 Verhandelingen der Koninklijke Akademie van Wetenschappen 

 te Amsterdam, 1894. 



29. Beijerinck, M. W. " Sur la Cecidiogenese et la Genera- 

 tion Alternante chez le Cynips calicis. Observations sur la galle 

 de L'Andricus circulans," Extrait des Archives Neerlandaises, 

 T. XXX, p. 387-444- 



30. Busgen, M. "Der Honigtau Biologische Studien an 

 Pflanzen und Pflanzenlausen . ' ' Zeitschrift fur Naturwissenschaf t . 

 Bd. XXV. 



31. Busgen, M. " Zur Biologic der Galle von Hormomyia 

 Fagi Htg. " Forstlich-naturwissenschaftliche Zeitschrift, Jan- 

 uar, 1895. 



32. Courchet, M. L. " Etude sur less Galles Causees par des 

 Aphidiens." Akademie des Sciences et Eettres de Montpellier. 

 Memoires de la section des sciences. 



33. Derbes, M. " Observations sur les Aphidiens qui fontles 

 Galles des Pistachiers." 



