_Development._--Entire contents of oötheca are eaten by the single larva. Last instar larva overwinters inside the oötheca. Emergence in Ohio was around the middle of June. The emergence hole made by this genus was about 2 mm. in diameter. The hole was made at the top side of the oötheca near one end. Adult took about 65 minutes to emerge from the time its mandibles first broke through the oöthecal wall. (Edmunds, 1954.) _Distribution._--Canada, Ontario, U.S.A.: Connecticut to Wisconsin, south to Florida and Texas. Upper Austral to Tropical Zones. (Townes, 1951.) =Hyptia= sp. _Natural host._--_Cariblatta delicatula_, Cuba (Hebard, 1916a); Parasite identified by Ashmead. =Hyptia= sp. (undescribed) _Natural host._--_Parcoblatta_ sp., U.S.A., Ohio (Edmunds, 1952a). =Prosevania punctata= (Brullé) _Synonymy._--_Evania punctata_ Brullé [Townes, 1949]. _Natural and experimental hosts._--_Blatta orientalis_, Istrian Peninsula (Fahringer, 1922); Algeria (Cros, 1942); U.S.A., Ohio (Edmunds, 1954). _Blattella germanica_? Europe? (Girault 1907, 1914); Europe (Fahringer, 1922). [The records on this host are extremely doubtful. Girault erroneously cited Marlatt (1902) as the source of this record; see footnote 6, page 236. Fahringer, however, claimed that he obtained seven female parasites from oöthecae of _Blattella germanica_. He placed female parasites with adults of _B. germanica_ in a glass cage. As soon as oöthecae could be seen between folds of a woolen rag, he removed all the larger cockroaches and held the oöthecae until the parasites emerged. Fahringer may have been dealing with a different species of cockroach, because placing oöthecae in crevices (or between folds of rag) is a habit foreign to _B. germanica_, the female of which usually carries her oötheca until hatching or until about a day before. Edmunds (1953b) could not induce this wasp to parasitize eggs of _B. germanica_.] _Periplaneta americana_, Istrian Peninsula (Fahringer, 1922); Palestine (Bodenheimer, 1930); U.S.A., Ohio (Edmunds, 1952, 1953b, 1954). _Adult behavior._--The wasps (pl. 33, A) are very active; they walk about a great deal and fly short distances. They are often found in abundance in buildings infested with the larger domiciliary cockroaches where they may reproduce for many generations without leaving the premises. Specimens have also been collected outdoors. (Edmunds, 1953, 1954.) As the adult walks about, the laterally compressed abdomen moves up and down like a waving flag; because of this behavior, these insects are commonly known as ensign-flies. Cros (1942) maintained adults 17 days without food. Edmunds (1954) fed adults on unidentified flowers in the laboratory. He also maintained them for 20 days after capture on a 5-percent honey solution.