ABSTRACT
The genus Pison Jurine (in Spinola), 1808 (Hymenoptera: Crabronidae) was revised by Menke, 1988MENKE, A.S. Pison in the new world: a revision (Hymenoptera: Sphecidae: Trypoxylini). Contrib. Am. Entomol. Inst., Ann Arbor, v.24, n.3, p.1171,.1988. and three subgenera were placed in synonymy with Pison: Pisonoides F. Smith, 1858; Krombeiniellum Richards,1962 and Entomopison Menke, 1968a. The genus includes 42 native species in the Neotropical Region and more of the half of these are found in Brazil. Some of them make mud nests on diverse substrates, such as: on the underface of broad leafs, on the wall of human constructions, boxes, windows, and in the edges of roofs. The coccons of some of these species are closed cells with a fine layer of mud in a small abandoned nest (made on vegetable fibres) of Mischocyttarus de Saussure, 1853 sp. (Hymenoptera.: Vespoidea, Vespidae, Polistinae, Mischocyttarini). This is the first record of nesting behavior for this species. Male of P. duckei is still undescribed. The third specie observed was P. delicatum Menke, n sp.
KEY WORDS:
Hymenoptera; Crabronidae; Pison duckei; Paureofaciale P; delicatum,; behavior.
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