1923] Notes on the Egg-Eating Habit of Bumblebees 201 
further suggested by the similarity in color between this food- 
paste of hivebees and their eggs. 
Literature Cited. 
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. 
Harter, R. 1890. Biologische Beobachtungen an Hummeln. 27. 
Bericht Oberhess. Gesellsch. Natur — u. Heilkimde, 
pp. 59-75. 
H offer, E. 1882-83. Die Hummeln Steiermarks. Lebensge- 
schichte und Beschreibung derselben. Leuschner & 
Lubensky, Graz. 
Huber, P. 1802. Observations on several Species of the Genus 
Apis, known by the Name of Humble-bees, and called 
Bombinatrices by Linnaeus. Trans. Linn. Soc. London, 
Vol. 6, pp. 214-298, pis. 25-27. 
Lindhard, E. 1912. Humlebien som Husdyr. Spredte Traek of 
nogle danske Humlebiarters Biologi. Tidsskr. Land- 
brugets Planteavl, Vol. 19, pp. 335-352, 4 figs. 
Perez, J. 1899. Les Abeilles. Paris (After Wagner). 
Phillips, E. F. 1921. Beekeeping. The Macmillian Company, 
New York. 
Plath, 0. E. 1922a. Notes on Psithyrus, With Records of Two 
New American Hosts. Biol. Bulk, Vol. 43, pp. 23-44, 
pi. 1. 
1922b. A Unique Method of Defense of Bremus 
(Bombus) fervidus Fabricius. Psyche, Vol. 29, pp. 
180-187. 
1923. Breeding Experiments With Confined Bremus 
{Bombus) Queens. Biol. Bull., Vol. 45, pp. 325-341. 
Putnam, F. W. 1864. Notes on the Habits of Some Species of 
Humble Bees. Proc. Essex Inst., Salem, Mass., VoL 
4, pp. 98-105. 
Bladen, F, W. L. 1912. The Humble-bee, Its Life-History and 
how to Domesticate it. Macmillan & Co., London. 
