LIBRARY

HYMENOPTERA 72'1
SANDHOUSE, G. A., "The North American bees of the genus Osmia {Hymenoptera:
Apoidea)," Mem. Ent. Soc. Wash. 1: 1-167, 11 pIs., 1939.
SCHMIEDEKNECHT, 0., Apldm Europae/JJ, fasc. 1: 1-1071 + index 2 pp. (An assortment
of separately numbered papers bound together and also numbered consecutively
as indicated.) 1882-1886?
SCHWARZ, H. F., "The genus Melipona. The type genus of the Meliponidre or stingless
bees," Bull. Am. Mus. Nat. Hist. 69: 231-256,10 pIs., 11 pp. refs., 1932.
--, "The social bees (Meliponidre) of Barra Colorado Island, Canal Zone," Am. Mus.
Novit. 781: 1-23, 1934.
--, "The stingless bees (Meliponidre) of British Guiana and some related forms,"
Bull. Am. Mus. Nat. lit'st. 74: 437-508, pIs. LII-LXII, 1938.
SNODGRASS, R. E., Anatomy and physiology of the honeybee, pp. i-xvi + 327, 108 figs.,
McGraw-Hill, N. Y., 1925.
STEVENS, O. A., "Notes on species of Hatietus visiting evening flowers (Hym.)," En/.
News 21: 35-44, 1920.
USINGER, R. L., "Stingless bees from Central Mexico," Gleanings in Bee Culture 63: 666-
667, 1 fig., 1935.