. Annual report. New York State Museum; Science; Science. FLIES AND OTHER HOUSEHOLD INSECTS 39 Control measures. Badly infested houses can be cleared of these pests most easily by thorough and perhaps repeated fumiga- tions with hydrocyanic acid gas as described on page 48. Carbon bisulfid, has also been advised as a fumigant. On account of the inflammability of the latter, we would prefer to use in houses the somewhat more poisonous hydrocyanic acid gas. Carbon bisulfid with its heavy fumes is particularly adapted to the destruction of these pests in the holds of vessels. A still safer method
. Annual report. New York State Museum; Science; Science. FLIES AND OTHER HOUSEHOLD INSECTS 39 Control measures. Badly infested houses can be cleared of these pests most easily by thorough and perhaps repeated fumiga- tions with hydrocyanic acid gas as described on page 48. Carbon bisulfid, has also been advised as a fumigant. On account of the inflammability of the latter, we would prefer to use in houses the somewhat more poisonous hydrocyanic acid gas. Carbon bisulfid with its heavy fumes is particularly adapted to the destruction of these pests in the holds of vessels. A still safer method of fumigation consists in burning pyrethrum in infested compartments. It is stated that the vapors of this insecticide are frequently more effective in destroying roaches than the use of the powder itself. The room should be kept closed from six to ten hours. The smoke of burning gunpowder is also very obnoxious and deadly to roaches, particularly the black Eng-. Fig. 21 Croton bug: a, h, c, d, successive stages in the development of the young; e, adult; f, female, with egg case; g, egg case enlarged; h, adult, with wings spread; all natural size except g. (After Riley) lish roach. The moistened powder should be molded into cones, placed in an empty fireplace and ignited. It is especially valuable in the case of old houses. There are a number of roach poisons placed upon the market and some of these are undoubtedly very efficacious, particularly if assisted by persistent cleanliness and the eradication of inaccessible haunts, so far as possible. We would further suggest the testing of naphthalene in the flake form, as described on page 27, as a means of at least partially suppressing this pest. The liberal use of Per- sian insect powder or pyrethrum is also of service in destroying these insects. The paralyzed cockroaches should be swept up and burned. A relatively simple method, described by Mr Tepper of Aus- tralia, is to mix plaster of paris one part, and flour three or fou
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