Fig. 7.—Cockroach-hunting wasps. A, Dolichurus stantoni leading a nymph of Blattella lituricollis to her nest, c. X 4. (Reproduced from F. N. Williams [1919].) B, Podium haematogastrum attaching her egg to an Epilampra sp. while on the side of a termite mound that contains the wasp's nest, c. X 1.6. C, Epilampra sp. parasitized by P. haematogastrum showing the wasp's egg attached to the right fore coxa, c. X 3.2. (B and C reproduced from Williams [1928], through the courtesy of Dr. F. X. Williams and F. A. Bianchi.)
Trirhogma sp.
Natural hosts.—Cockroaches, Oriental region (Williams, 1918, 1928): As far as is known species of this genus of wasps hunt cockroaches.
Family SPHECIDAE
Tachysphex blatticidus Williams
Natural hosts.—Chorisoneura sp., adults, Trinidad, St. Augustine (Callan, 1942): The wasps nest gregariously in sandy places. The wasp itself is parasitized by the mutillid Timulla (Timulla) eriphyla Mickel.
Cockroaches, Trinidad (Williams, 1941a; Callan, 1950).