ENTOMOLOGY

578 SANITARY ENTOMOLOGYbrown with two, usually conspicuous, longitudinal, blackish stripes onthe pronotum. Both sexes are fully winged, both tegmina and wingsexceeding the tip of the abdo~en in both sexes. The male is more slenderthan the female but the last abdominal segment does not exhibit sexualdifferences as in the case of the above s cies. It is a more active insectthan orientalis, breeds faster, and is no less prevalent in houses,but, beingless restricted to filthy surroundings, is more often found in houses of abetter cla:ss. But no ho'me; no matter how well kept, is immune frominvasion now and then by one or more of these roaches, as not a store offood, bundle of laundry, or .lot -of supplies of any kind can be broughtin without danger of one or more roaches being introduced.This species seldom occurs in company with the oriental roach, a houseoverrun with one species usually being free from the other.FIG. 7::?-The German roach, BZ(J)ttelia germanica: a, First stage; b, second stage; c,third stage; d, fourth stage; e, adult; f, adult female with egg case; g, egg case,enlarged; h, adult with wings spread. All natural size except g. (From Riley.)Periplaneta americana (Linnaeus) (fig. 73)This, the American roach, is less frequently abundant in houses thanthe smaller forms, at least usually so, though in- the warmer parts ofthe world it is frequently the prevalent household species. It is morefrequently reported as doing damage to plants in greenhouses, etc., andvery often it creates havoc indoors with books, clothing, and othermaterial.This roach is decidedly larger than either of the foregoing species,both sexes being about one and one-half inches in total length, oftensomewhat longer and rarely as much as a quarter of an inch shor~r.Both sexes are fully winged, the wings usually surpassing somewhat thetip of the abdomen. T_he general color is reddish brown with the pronotumgenerally -bordered around the disk with lighter yellowish color,usually in distinct contrast to the darker central portion. The ventralsurface of the last abdominal segment of the two sexes here differ as in