Principal household insects of the United States . uropeancouutries, but, like most ofthe other domestic species,has become world-wide in distribution. In* this country it is very oftenstyled the Croton bug, this designation coming from the fact, alreadyalluded to, that attention was first prominently drawn to it at the timeof the completion cf the Croton system of waterworks in New YorkCity. It hadprobably been wx * , • introduced long ^ \ \y ^> f i(j^) previously, butthe extension ofthe waterworkssystem and ofpiping afforded itmeans of ingressinto residences,and greatly en-couraged itsspr
Principal household insects of the United States . uropeancouutries, but, like most ofthe other domestic species,has become world-wide in distribution. In* this country it is very oftenstyled the Croton bug, this designation coming from the fact, alreadyalluded to, that attention was first prominently drawn to it at the timeof the completion cf the Croton system of waterworks in New YorkCity. It hadprobably been wx * , • introduced long ^ \ \y ^> f i(j^) previously, butthe extension ofthe waterworkssystem and ofpiping afforded itmeans of ingressinto residences,and greatly en-couraged itsspread and facili-tated its multi-plication. The dampness of water pipes is favorable to it, and it maybe carried by the pressure of the water long distances through thepipes without injury. This roach has so multiplied in the easternUnited States that it has now become the commonest and best known FIG. 41.—The oriental roach (Periplaneta orientalis): a,female; b, male; c, side view of female; d, half-grownspecimen—all natural size (original).. Fig. 42.—The German roach {Ectobiagermanica): a, first stage; b, secondstage; c, third stage; d, fourth stage; e, adult; /, adult female -with egg-case; g, egg-case—enlarged; h, adult with wiugs spread—all natural sizeexcept #. (From Riley.) See Kalms Travels, Vol. I, p. 321; II, p. 256. COCKROACHES AND SOUSE !>3 of the domestic species, and its injuries to food products, books, etc.,and the disgusting results of its presence in pantries, storehouses, andbakeries, give it really a greater economic importance than any of tin-other species. It is very light In-own in color, and characteristically marked on tin-thorax with two dark-brown stripes. It is more active and wary thanthe larger species and much more difficult to eradicate. It is thesmallest of the domestic species, rarely exceeding five-eighths of aninch in length, and multiplies much more rapidly than the others, thebreeding period being shorter and the number
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