The Nesting Behavior and Larval Morphology of Pison Koreense (Radoszkowrski) (Hymenoptera: Sphecidae)

The genus Pison has a wide distribution, occurring in most tropical countries and extending into the temperate zones. Turner (I916) lists 50 species occurring in Australia, I7 in the Austro-Malayan Region, I3 in the Oriental Region, nine in the Palearctic Region, nine in the Ethiopian Region, and eleven species from the Americas. The only native species in the U. S. or Canada is apparently P. laeve Smit’h, reported from Georgia (Krombein, I95I). Pison koreense, a native of Korea, China, and Japan, was apparently introduced into this country after World War II (Krombein, I958). At the time of Krombein’s publication it had been collected from two localities: McLean, Virginia. in 954, and Palisades Park, Illinois in I957. Since that time it has been reported from Plum-