A number of observations have been recorded which indicate that sometimes cockroaches may be predatory. According to Ealand (1915), nymphs of the cockroach _Pseudomops cincta_ fed on the Argentine ant _Iridomyrmex humilis_. In the laboratory, _Eurycotis floridana_ has been observed to catch and devour the wasp _Anastatus floridanus_ which parasitizes the eggs of _Eurycotis_ (Roth and Willis, 1954a). _Parcoblatta pensylvanica_ was observed devouring a larva of _Polistes_ sp. in its cell in a deserted wasps' nest (Rau, 1940). Brigham (1866) saw a cockroach kill and eat a centipede four or five inches long. Annandale (1910) described the destruction in Calcutta of termites by _Periplaneta americana_. During a heavy rain storm many termites flew into the dining room and were set upon by the cockroaches which seized them with their mandibles and began to gnaw their abdomens. If disturbed, the cockroaches carried the termites away in their mandibles without using their legs to seize, hold, or carry the prey. Sometimes only the abdomen, but other times the whole body with the exception of the wings, was devoured. Perhaps this observation led Allyn (Anonymous, 1937) to theorize that, first, cockroaches could eradicate termites from houses, and then the blattids in turn could be eliminated. Falls (1938) has pointed out the unfeasibility of this idea. _Blattella vaga_ has shown some tendency to eat plant lice (Flock, 1941a). Certain small cockroaches found beneath cane leaf-sheaths, in the Philippine Islands, preyed in part upon leafhoppers (Uichanco, _in_ Williams et al., 1931). Takahashi (1924) stated that the American cockroach will eat the eggs of the hemipteron _Cantao ocellatus_ (Thunberg). Cunliffe (1952) observed mite-infested cockroaches (_Blatta orientalis_, _Blattella germanica_, and/or _Periplaneta americana_) dislodge and eat the mite _Pimeliaphilus podapolipophagus_. Sonan (1924) reported that cockroaches (_P. americana_ and _P. australasiae_) devoured the egg clusters and first instar larvae of _Prodenia litula_ and the first instar larvae of _Attacus atlas_ which were being reared in the laboratory. Lederer (1952) stated that _Periplaneta americana_ ate reptile eggs in the aquarium at Frankfurt am Main. Pettit (1940) stated that cockroaches "are said to have destroyed a large colony of dermestids used to skeletonize carcasses at the University of Kansas."