Caste ontogeny and the distribution of reproductive cells on the combs of Melipona beecheii (Apidae: Meliponini) Humberto Moo-Valle, José Javier G. Quezada-Euán, Julio Canto-Martín and Jorge A. Gonzalez-Acereto Apidologie, 35 6 (2004) 587-594 DOI: 10.1051/apido:2004054