Cockroaches, Australia (E. F. Riek, personal communication, 1955): Reared from some of the larger species. Family MUSCIDAE =Coenosia basalis= Stein _Host._--Eggs of _Parcoblatta_ sp., Ohio (Edmunds, 1952a). Family SARCOPHAGIDAE =Sarcophaga omani= Hall _Host._--_Arenivaga bolliana_, Texas (Wirth, personal communication, 1953): Specimens in U.S. National Museum. =Sarcophaga lambens= Wied. _Synonymy._--_Sarcophaga sternodontis_ (Towns.). Hoffman (1927) claimed that approximately 40 percent of some specimens of _Pycnoscelus surinamensis_ collected in southern Haiti were parasitized by _S. lambens_. However, according to entomologists at the University of Puerto Rico Agricultural Experiment Station, Hoffman was incorrect in his observations: _S. lambens_ was never reared from a living insect and had been recovered only from dead cockroaches and other dead insects and was considered saprophytic rather than parasitic (Schwabe, 1950b). =Sarcophaga= spp. Sanjean (1957) reared various species of sarcophagid larvae on _Periplaneta americana_ which were freshly killed or chopped up; first instar larvae were also introduced into the body cavity of cockroaches which had their heads and legs removed. Adult sarcophagids were collected and freshly killed American cockroaches used as bait. Order COLEOPTERA Family CARABIDAE =Harpalus pennsylvanicus= De Geer _Experimental prey._--_Cryptocercus punctulatus_, U.S.A. (Cleveland et al., 1934): This beetle is often found in the galleries of _C. punctulatus_ in nature. In the laboratory it killed and devoured cockroaches as large as itself. Family DYTISCIDAE =Rhantus pacificus= Boisduval _Experimental prey._--Cockroaches, disabled, Hawaii (Williams, 1936): This beetle, which is common in mountain streams, located wounded cockroaches in an aquarium by sense of smell or taste rather than sight. Family LAMPYRIDAE =Undetermined larva= _Experimental prey._--_Parcoblatta virginica_, adult female (pl. 33, C), U.S.A. (Roth and Willis, unpublished data, 1953). Family RIPIPHORIDAE[5] =Neonephrites partiniger= Riek _Natural host._--Cockroach (undescribed genus belonging to the Pseudomopinae), Australia Capital Territory (Riek, 1955). =Neorhipidius neoxenus= Riek _Natural host._--_Robshelfordia longiuscula_ or _Robshelfordia circumducta_, Australia Capital Territory (Riek, 1955). =Paranephrites xenus= Riek _Natural host._--_Oniscosoma granicollis_, Australia Capital Territory (Riek, 1955). =Rhipidioides ableptus= Riek _Natural host._--_Balta patula_, Australia, Victoria (Riek, 1955): Pupal stage lasted only 3 days. =Rhipidioides adynatus= Riek _Natural host._--_Escala_ sp. or an undescribed genus of Pseudomopinae, Australia, Victoria (Riek, 1955). =Rhipidioides fuscatus= Riek _Natural host._--_Ellipsidion affine_, Australia, New South Wales (Riek, 1955). =Rhipidioides helenae= Riek