1922] Unique Method of Defense of Br emus fervidus Fabricius 185 



Bremus distinguendus colony ever been reported as victimized 

 by a Psithyrus. These facts lead the writer to surmise that 

 Bremus distinguendus, latreillellus, and perhaps also Bremus 

 fragans Pallas, may prove to be "Honey-daubers." 



LITERATURE CITED. 



ARMBRUSTER, L. 1914. Probleme des Hummelstaates. 



Biol. Centralbl., Vol. 34, pp. 685-707, pi. 2. 

 BACHMANN, M. 1916. Beobachtungen vor dem Hummel- 

 nest. Ent. Zeitschr. Frankfurt a. M., Vol. 29, pp. 89-90, 



93-94, 98-99, 103-104; Vol. 30, pp. 1-3. 

 BENGTSSON, S. 1903. Studier och iakttagelser ofver Humlor. 



Ark. Zool., Vol. 1, pp. 197-222. 

 COVILLE, F. V. 1890. Notes on Bumble-Bees. Proc. Ent. 



Soc. Washington, Vol. 1, pp. 197-203. 

 FRANKLIN, H. J. 1912-13. The Bombidse of the New World. 



Trans. Amer. Ent. Soc, Vol. 38, pp. 177-486, Vol. 39, pp. 



73-200, pis. 1-22. 

 FRIESE, H. UND WAGNER, F. V. 1910. Zoologische Studien 



an Hummeln. Zool. Jahrb., Abt. Syst., Vol. 29, pp. 1-104, 



pis. 1-7. 

 PRISON, T. H. 1917. Notes on Bombidffi, and on the Life 



History of Bombus auricomus Robt. Ann. Ent. Soc. America, 



Vol. 10, pp. 277-286, pis. 23, 24. 



1918. Additional Notes on the Life History of Bombus 



auricomus Robt. Ibid., Vol. 11, pp. 43-48, pi. 3. 

 GOEDART, J. 1700. Metamorphosis Naturalis sive Insectorum 



Historia. Georgium Gallet, Amstelodami. Pars secunda, 



pp. 174-192, pi. 46. 

 GUNDERMANN, E. 1908. Einige Beobachtungen an Hum- 



melnestern. Ent. Wochenbl., Vol. 25, pp. 30-31, 35-36. 

 HARTER, R. 1890. Biologische Beobachtungen an Hununcln 



27. Bericht. Oberhess. Gesellsch. Natur-u. Ileilkunde, 



pp. 59-75. 



