. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Blattidae 283 Family BLATTIDAE CARE AND REARING OF BLATTELLA GERMANICA C. M. McCay and R. M. Melampy, Cornell University Blatella germanka is a useful insect for physiological studies because of its quick rate of growth, rapid reproduction, and omnivorous feeding habits. An ordinary fish aquarium or museum jar covered tightly with cheesecloth may be used as a cage for a stock colony. Water may be supplied by an ordinary baby chick waterer. Absorbent cotton sho
. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Blattidae 283 Family BLATTIDAE CARE AND REARING OF BLATTELLA GERMANICA C. M. McCay and R. M. Melampy, Cornell University Blatella germanka is a useful insect for physiological studies because of its quick rate of growth, rapid reproduction, and omnivorous feeding habits. An ordinary fish aquarium or museum jar covered tightly with cheesecloth may be used as a cage for a stock colony. Water may be supplied by an ordinary baby chick waterer. Absorbent cotton should be placed in the pan of the fountain as it prevents drowning of the insects. A stock diet of ground whole wheat 50',, dried skim milk 45%, and dried bakers' yeast 5% is adequate for growth and reproduction. For experimental work with individual insects or small groups, ordinary half-pint milk bottles may be used as cages (Fig. 63). The milk cap is perforated with numerous pin-holes to allow air to enter the container. The water is supplied by a vial containing damp cotton which is mounted on the cap by a cork. The diet to be studied is placed in a small paper cup or similar COCKROACHES* Fig. 63.— Rearing bot- tle for Blat- ella germanica. Cockroaches may be kept in wide-mouthed gallon glass jars, each containing a layer of sawdust on the bottom and a small pan of water. Over the top of each jar is stretched a piece of cheesecloth, held in place by a rubber band. A thin line of vaseline is placed around the inside shoulder of the jar, and the cockroaches do not attempt to pass this line.** The jars are kept in a rather dark place where the temperature averages 700 F. * Reprinted, with slight changes, from Turtox News 7:Xo. n, 1929, by John M. Kelley, General Biological Supply House. ** Editor's Note: J. Franklin Yeager, of Iowa State College, has described to us the cage he uses for keeping large numbers of Periplaneta. It consists of a wooden framework on legs
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