- Onthophagus villanuevai Delgado & Deloya, 1990

Paratype: 1 [unknown sex]. MEXICO: Guerrero, Chilpancingo, Palo Blanco, 1140 m, 30–31/VIII/1989. Col. L. Delgado y J. Blackaller, NTP-80; Bosque pino- encino.

Conservation status: Complete, well-preserved.

Paratype: 1 [unknown sex]. MEXICO: Guerrero, Mochitlán, Acahuizotla, 650 m, VI/1986. Col. L. Delgado C., NTP-80; bosque trópical med. subperenifolio.

Conservation status: Complete, well-preserved.

Paratype: 1 [unknown sex]. Ídem. VIII/1 986.

Conservation status: Complete, well-preserved.

Paratypes: 2 [unknown sex]. Ídem. X/1986.

Conservation status: Complete, well-preserved.

Paratypes: 3 [unknown sex]. Ídem. 30/IX/1986.

Conservation status: Complete, well-preserved.

Paratypes: 2 [unknown sex]. Ídem. 29/VIII/1989. Col. L. Delgado y J. Blackaller; fermento de guayaba colocado a 2 m de altura; 1:00–2:00 pm.

Conservation status: Complete, well-preserved.