1922] Unique Method of Defense of Bremus fervidus Fabricius 185 
Bremus distinguendus colony over 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. Zook, 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. 
FRISON, T. H. 1917. Notes on Bombidse, and on the Life 
Llistory 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. Ibick, Vol. 11, pp. 43-48, pk 3. 
GOEDART, J. 1700. Metamorphosis Naturalis sive Insectorum 
Llistoria. Georgium Gallet, Amstelodami. Pars seeunda, 
pp. 174-192, pk 46. 
GUNDERMANN, E. 1908. Einige Beobachtungen an Hum- 
melnestern. Ent. Wochenbl., Vol. 25, pp. 30-31, 35-36. 
HARTER, R. 1890. Biologische Beobachtungen an Hummeln 
27. Bericht. Oberhess. Gesellseh. Natur-u. Heilkunde, 
pp. 59-75. 
