In order to know the nocturnal fauna of Melolonthidae from the main agave tequilero fields in Jalisco, Mexico, monthly captures of adults were carried out from May to August 2007, using a fluorescent light black trap, funnel type, in Ixtlahuacán del Río, Tepatitlán de Morelos and San Juanito de Escobedo, Jalisco, Mexico. A total of 57,263 specimens included in 20 species were collected. Phyllophaga ravida (Blanchard) (58.7%), Paranomala cincta (Say) (14.1%), Phyllophaga misteca (Bates) (11.6), P. dentex (Bates) (2.5%) and Paranomala hoepfneri (Bates) (1.8%) were the best represented species. The highest abundance was registered in June (96%) and the lowest capture in July. The greatest species richness (17 species) was recorded in Tepatitlán de Morelos. A key to identify the recorded species is included.
