Analysis of the Braconidae (Hymenoptera: Ichnelimonoidea) fauna richness in natural remnants of the Area de Protecao Ambiental (APA) of Descalvado, SP. A survey of the Braconidae fauna on fragmentary natural environments at northeast Sao Paulo State was conducted using Malaise traps installed in five sites of Area de Protecao Ambiental of Descalvado. A total of 2,262 specimens, representing 22 subfamilies and 94 genera, was sampled throughout a period of sixteen months (from May, 1999 to August, 2000). Biological data were obtained from current literature and behavior patterns of host utilization for the studied fauna, mainly Braconidae which have been successful in control of agricultural insect pests. Statistical analyses indicated that the asymptote of the genera richness has been approached using this sampling method. This is the most complete survey yet available from natural fragmentary areas of the Descalvado Braconidae fauna. Patterns of distribution and richness of the Braconidae genera were established. Cluster Analysis was adopted taking as attribute the number of Braconidae genera. Ecology; Habitat utilization; Habitat; Terrestrial habitat; Land and freshwater zones; Neotropical region; South America Braconidae; Community structure, protected area; Distribution within habitat; Habitat preference; Forest and woodland; Brazil; Sao Paulo; Descalvado protected area; Natural fragmented sites, faunal richness none