. Entomologie sanitaires ; l'entomologie de la maladie, de l'hygiène et l'assainissement. Le nom commun oriental roach est préférable pour thisspecies. Blatta orientalis est une espèce d'un Gardon de couleur noirâtre. Themale est un pouce, ou un peu moins, de longueur, d'une couleur brun très foncé, andfurnished avec les tegmina et ailes, couvrant environ les deux tiers de l'abdomen, les cafards 377 tegmina montrant souvent rougeâtres à yelloAv exprimés. Le femaleis nettement plus grande que le mâle, d'une couleur noire uniforme plus andprovided avec tegmina uniquement, et ces très courts, étant seulement sur le pronotum comme aslong. Dans

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. Sanitary entomology; the entomology of disease, hygiene and sanitation. The common name oriental roach is preferable for thisspecies. Blatta orientalis is a medium sized roach of a blackish color. Themale is an inch, or a little less, in length, of a very dark-brown color, andfurnished with both tegmina and wings, covering about two-thirds of the COCKROACHES 377 abdomen, the tegmina often showing a reddish yelloAv cast. The femaleis noticeably larger than the male, of a more uniformly black color andprovided with tegmina only, and these very short, being only about aslong as the pronotum. In addition to the larger size and the shortertegmina, the female can be readily distinguished from the male by theventral surface of the terminal segment of the abdomen, which is planein the male and divided longitudinally for its entire length in the female.This species is truly a gregarious insect, all stages living amicablytogether and often in incredible numbers where conditions are favorablefor its occurrence. It is especially prevalent in cities, being, like the. Fig. 71.—The Oriental roach, Blatta orientalis: a, Female; b. male; r, side view of fe-male; (I. half-grown specimen. All natural size. (Marlatt.) From U. S. Dept.Agr., Farmers Bull. 658, figs. 1, 4. other domesticated species, less generally abundant in rural sections. Itis a lover of warm, damp, unclean locations and often abounds in cheaprestaurants and such places. The female may deposit a number of egg-cases a season, each containing about sixteen eggs, and breeding is con-tinuous when conditions of warmth, etc., are favorable. Blattella germanica (Linnaeus), Caudell (fig. 72) The German roach, or Croton bug, vies with the oriental roach in itsimportance as a household pest. It enjoys about as wide a distributionas its larger relative and in some sections it is the more important of thetwo. It is decidedly smaller than orientalis, the male being about one-halfinch long and the female a little longer. The ge

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