The Asian citrus psyllid (ACP) Diaphorina citri Kuwayama (Hemiptera: Liviidae) was detected in Mexico in 2002, and since then national researchers have been sampling in different production areas of citrus in order to find natural enemies with potential as biological control agents to be included in integrated pest management programs. In September 2013, an unidentified coccinellid species was observed apparently feeding on D. citri in the state of Colima, Mexico. The aim of this work is to identify this coccinellid and verify if D. citri is part of its diet. The coccinellid was identified as Exochomus marginipennis (LeConte). Under laboratory conditions feeding habits were studied, and it was verified that adults of E. marginipennis can feed on both eggs and larvae of D. citri.