Stingless bees of the Genus Trigona (Subgenus Trigonella) with notes on the reduction of spatha in male genitalia of the Subgenus Tetragonula (Hymenoptera, Apidae)
Shoichi F. Sakagami and Tmiji Inoue
Entomological Society of Japan, 1987
"Reprinted from the Kontyu (昆蟲), vol. 55, no. 4" -- T.p.
Bibliography: p. 626-627