44 O. E. PLATH. 



Morice, F. D., and Durant, J. H. 



'14 The Authorship and First .Publication of the " Jurinean Genera of 



Hymenoptera." Trans. Ent. Soc. London, pp. 339-437. 

 Miiller, H. 



'71 Anwendung der Darwinistischen Lehre auf Bienen. Verb. Naturh. 



Ver. Preuss. Rheinl. u. Westphal.. pp. 196, 2 pis. 

 Newman, E. 



'34 Attempted Division of British Insects into Natural Orders. Ent. Mag., 



Vol. 2, pp. 379-431- 

 Perez, J. 



'83 Contribution a la Faune des Apiares de France, 2 e partie. Act. Soc. 



Linn. Bordeaux, Vol. 37, pp. 205-378, 2 pis. 

 Putnam, F. W. 



'65 Notes on the Habits of Some Species of Humble Bees, and on the 

 Leaf-cutting Bee. Proc. Essex Inst. Salem, Mass., Vol. 4, pp. 98-107. 

 Rau, Phil and Nellie. 



'18 Wasp Studies Afield. Princeton University Press. 

 Saunders, E. 



'03 On the Relationship of Aculeate Inquilines and their Hosts. Ent. 



Month. Mag (2), Vol. 14, pp. 272-274. 

 Schmiedeknecht, 0. 



'07 Die Hymenopteren Mitteleuropas. Gustav Fischer, Jena. 

 Sladen, F. W. L. 



'99 Bcmbi in Captivity, and Habits of Psithynis. Ent. Month. Mag., 



Vol. 35, pp. 230-234. 

 '12 The Humble-bee. Its Life-History and How to Domesticate it. Mac- 



millan & Co., London. 

 '15 Inquiline Bumble-Bees in British Columbia. Canad. Ent., Vol. 47, 



P- 84. 

 Smith, F. 



'55 Catalogue of British Hymenoptera in the Collection of the British 



Museum. Part I, London. 

 Verhoeff, C. 



'92 Zur Kenntnis des biologischen Verhultnisses zwischen Wirt- und Para- 



siten-Bienenlarven. Zool. Anzeig., Vol. 15, pp. 41-43- 

 Wagner, W. 



'07 Psycho-biologische Untersuchungert an Hummeln mit Bezugnahme auf 

 die Frage der Geselligkeit im Tierreiche. Zoologica, Vol. 19, pp. i- 

 239. i Pi-, 136 figs. 

 Wheeler, W. M. 



'04 A New Type of Social Parasitism among Ants. Bull. Amer. Mus. Nat. 



Hist., Vol. 20, pp. 347-375- 



'10 Ants, their Structure, Development, and Behavior. Columbia Univer- 

 sity Press. 

 '19 The Parasitic Aculeata, a Study in Evolution. Proc. Amer. Philos. 



Soc., Vol. 58, pp. 1-41. 

 Wheeler, W. M., and Taylor, L. H. 



'21 J'cspa arctica Rohwer. a Parasite of Vespa diabolica De Saussure. 

 Psyche, Vol. 28, pp. 135-144, 3 figs. 



