A new species of Neoheterospilus, N. chamelae n. sp., is described from the ChamelaCuixmala biosphere reserve in the Pacific coast of Jalisco, Mexico. This new species is placed within the subgenus Harpoheterospilus as it has an almost indistinct suture between…

Megalopta Smith, 1853, is a Neotropical genus of nocturnal or crepuscular bees. Two subgenera are recognized with most of its nearly 30 species placed in the nominate subgenus. Species of Megalopta s. str. are more commonly collected than species of…

In this paper we analyze the growth and early survival of two congeneric columnar cacti: the rare Neobuxbaumia macrocephala (with low population densities and a narrow distribution range), and the relatively common Neobuxbaumia mezcalaensis (with dense populations and a broader…