The rare phanaeine dung beetle Phanaeus alvarengai Arnaud 1984 was described from two specimens. Several recent collections of this species are reported here, along with behavioral observations; this new material is a basis for amending earlier descriptions of P. alvarengai. Flight-activity period was recorded as near sunrise for no more than 10 minutes and diet preference appeared to be herbivore dung. Dung-burial behavior was similar to the congeners P. chalcomelas (Perty) and P. cambeforti Arnaud.
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