. Bulletin - United States National Museum. Science. Fig. 17 -A Clotbes-motli (Tinea pellionella)—enlarged, larva; c, larva in case. a, adult; b, "A convenient system of classification for tlie Lepidoptera is based on tlie structure of tlie anteniiae. By it we get two great sections: 1st, But- terflies (Rhopaloce- RA)5 2d, Moths (Het- EROCEEA), wMcli lat- ter may again be di- vided into Crepuscu- lar and l!^octurnal Moths. Butterflies are at once distin- guished from moths by their antennae be- ing straight, stiff and Jcnohhed, and by being day-fliers or diurnal; while moths have the ante
. Bulletin - United States National Museum. Science. Fig. 17 -A Clotbes-motli (Tinea pellionella)—enlarged, larva; c, larva in case. a, adult; b, "A convenient system of classification for tlie Lepidoptera is based on tlie structure of tlie anteniiae. By it we get two great sections: 1st, But- terflies (Rhopaloce- RA)5 2d, Moths (Het- EROCEEA), wMcli lat- ter may again be di- vided into Crepuscu- lar and l!^octurnal Moths. Butterflies are at once distin- guished from moths by their antennae be- ing straight, stiff and Jcnohhed, and by being day-fliers or diurnal; while moths have the antennae tapering to a point, and are, for the most part, night-flyers or nocturnal. The crepuscular moths, composed mostly of the Sphinges or Hawk-moths, hover over flowers at eve, and connect the two sections not only in habit, but in the character of the antennae which first thicken toward the end, and then suddenly termi- nate in a point or hook. " Order HEMIPTEEA {rj,ac, half; -zepo,, wing). Bugs. The insects of this order are naturally separated into two great sec- tions; 1st, Half-winged Bugs, or Heteroptera {k'-spoq different; -re^o^vv, wing) having the basal half of the front wings (called liemelytra) coriaceous or leathery, while the apical part is membranous. The wings cross flatly over the back when at rest; 2d, Whole- winged Bugs, or HOMOPTERA {op-oq^ equal; ^ wing), having all four wings of a uniform mem- branous nature and folding straight down the back The latter, if separated, may be looked upon as a Sub-. FiG. 18.—A Plant- bug (Euschistes punctipes). when at rest, order. "Transformations incomplete; L e., the larvae and pupae have more or less the image of the perfect insect, and difter little from it except in lacking wings. "The genuine or half-wiuged Bugs (Figs. 18 and 19) are usually flattened in form, when mature; though more rounded in the adolescent stages. They may be divided into Land Bugs {Aiiromrisa) and Water Bugs {Hydrocorisa
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