. Elementary entomology . FIG. 91. The German roach (Ectobia germanica) a, first stage ; &, second stage ; <:, third stage ; d, fourth stage ; e, adult; /, adult female with egg-case; g, egg-case (enlarged) ; //, adult with wings spread. (All natural size except g.) • (From Riley) main strength of the insect orchestra of a drowsy summer even- ing, while others are among the most destructive pests. We have already become fairly well acquainted with a common grasshopper (pp. 53-56) which forms a good type of the order. The biting mouth-parts, leathery fore-wings, and fanlike hind-wings ma
. Elementary entomology . FIG. 91. The German roach (Ectobia germanica) a, first stage ; &, second stage ; <:, third stage ; d, fourth stage ; e, adult; /, adult female with egg-case; g, egg-case (enlarged) ; //, adult with wings spread. (All natural size except g.) • (From Riley) main strength of the insect orchestra of a drowsy summer even- ing, while others are among the most destructive pests. We have already become fairly well acquainted with a common grasshopper (pp. 53-56) which forms a good type of the order. The biting mouth-parts, leathery fore-wings, and fanlike hind-wings make the order easily distinguishable, and from the latter characteristic comes the name " Orthoptera," from orthos (straight) and pteron (wing), referring to the straight-folded wings. The order is divided into six families, which are readily distin- guished as regards both structure and habits. 76
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