LAUSR

While monitoring phytophagous insects associated with the commercial production of mangosteen, Garcinia mangostana L. (Clusiaceae), in Chiapas, Mexico from 2015 to 2019, we observed damage to the vegetative and reproductive parts of the plants caused by stingless bees, Trigona spp. Specimens were collected, preserved in 75% alcohol, and later mounted. Using the taxonomic keys of Ayala (1999, Fol. Entomol. Mex. 106: 1–123), Trigona fuscipennis Friese and T. fulviventris Guérin-Meneville (Hymenoptera: Apidae: Apinae: Meliponini ) were subsequently identified. Voucher specimens are deposited in the Insect Collection at El Colegio de la Frontera Sur, Unidad Tapachula (registration number SEMARNAT CHIS-INV-133-09-02, acronym ECO-TAP-E). The mangosteen orchards from which these specimens were collected were located in the municipality of Tuxtla Chico (N 1485835 , W 928918 , 314 m), Huehuetán (N 1580035 , W 9282620 , 20 m), and Tapachula (N 5285233 , W 9282125 , 47 m) in Chiapas, Mexico. The Trigona genus is morphologically characterized by a longitudinal elevation on the inner surface of the posterior tibia, which is covered by keirotrichia, while the inner surface of the posterior barsitarsus has a more or less circular silky basal area. In addition, mandibles have three or four teeth. Trigona fuscipennis is distinguished by black mandibles with five teeth of reddish-brown distal margin, a