Vélez, D. and Vivallo, F. 2012. A new South American species of Centris (Heterocentris) Cockerell, 1899 with a key to the species with horn-like projections on the clypeus (Hymenoptera: Apidae: Centridini). Zootaxa. 3357, 1 (Jun. 2012), 49–55. DOI:https://doi.org/10.11646/zootaxa.3357.1.4.