From the known entomophagous habits of the lower ants (Wheeler, 1928), we wonder that there are not more records of ants feeding on cockroaches, because this act must occur frequently. Kirby and Spence (1822) stated that R. Kittoe had observed in Antigua that ants which nested in the roofs would seize a cockroach by the legs so it could not move, kill it, and carry it up to their nest. Hotchkiss (1874) observed ants kill cockroaches on shipboard. Cockroaches attracted to sugar in the pantry were killed and carried off by the ants. The destruction of cockroaches by army ants has been recorded by Bates (1863), Wallace (1891), Beebe (1917, 1919), Howes (1919), and others. Dead and mutilated specimens of _Ischnoptera_ sp. [undoubtedly _Parcoblatta americana_ (Gurney, personal communication, 1958)] are common in the nests of species of _Formica_ in California (Mann, 1911). =Aphaenogaster picea= Emery _Natural prey._--_Ectobius pallidus_, U.S.A., Massachusetts (Roth and Willis, 1957). =Camponotus pennsylvanicus= (De Geer) _Common name._--Carpenter ant. _Natural prey._--_Parcoblatta pensylvanica_, U.S.A. (Rau, 1940): The ants entered traps set up to capture the cockroach and carried off about a dozen adults of both sexes. =Dorylus (Anomma) nigricans= subsp. =sjöstedi Emery= _Natural prey._--Small cockroach, Belgian Congo (Raignier and van Boven, 1955). =Dorylus (Anomma) wilverthi= Emery _Natural prey._--Small cockroaches, Belgian Congo (Raignier and van Boven, 1955). =Dorylus= sp. _Common name._--"Safari ant." _Natural prey._--Cockroaches, Africa, Lake Victoria (Carpenter, 1920): When the "Safari ants" were hunting, many species of cockroaches were driven from hiding among dead leaves in the forest. The cockroaches rushed about but easily fell prey to the ants which tore them to bits. =Eciton burchelli= (Westwood) _Common name._--Army ant. _Natural prey._--Cockroaches, Panama Canal Zone (Johnson, 1954; Schneirla, 1956). =Formica omnivora= _Synonymy_.--The identity of this form is unknown. There are no species of _Formica_ on Ceylon. There was another _Formica omnivora_ described from tropical America, whose identity is also unknown (W. L. Brown, personal communication, 1956). _Natural prey._--Cockroaches, Ceylon (Kirby and Spence, 1822). =Iridomyrmex humilis= Mayr _Common name._--Argentine ant. _Natural prey._--Cockroaches, injured individuals only (Ealand, 1915). =Lasius alienus= (Förster) _Natural prey._--_Ectobius pallidus_, U.S.A., Massachusetts (Roth and Willis, 1957). =Pheidole megacephala= (Fabricius) _Common name._--Big-headed ant. _Natural prey._--_Holocompsa fulva_, Hawaii (Illingworth, 1916). _Nauphoeta cinerea_ and _Pycnoscelus surinamensis_, Hawaii (Illingworth, 1914, 1942): The ants followed and killed _N. cinerea_ and _P. surinamensis_ as they burrowed in moist soil and attacked and destroyed _N. cinerea_ in breeding cages. XIII. VERTEBRATA Class PISCES