Especies del complejo "gallina ciega" del género Phyllophaga en Guanajuato, México

information on morphology, biology and distribution of 13 species of the genus phyllophaga collected in black light tramps at 11 sites in state of guanajuato from 1998 to 2006 in areas where rain fed maize is grown. according to the collected data, the species p. brevidens (bates), p. misteca (bates), p. obsoleta (blanchard), p. polyphylla (bates), p. porodera (bates), p. ravida (blanchard) p. setifera (burmeister) and p. vetula (horn) are damaging diverse crops in guanajuato mexico. the altitude above sea level and the annual average precipitation in the sampled sites varies from 1 700 to 2 480 meters and 509.6 to 735.8 mm, respectively. the species p. ravida (blanchard) presented the widest distribution in the state and the species p. lineatus (bates), p. setifera (burmeister), p. rubella (bates), and p. lenis (horn) are new records for the state of guanajuato.