Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . as broad bejond the middle as nearthe base, the costal border convex in its outer half, with nu-merous and piominent cross-veins but no reticulations ; whenat rest, overlapping quite completely, even close to the base, LIBELLULID^. 597 much as in the Perlarice, and probably with the sides pro-tected near the base by the deflected marginal and scapular(subcostal) areas. Scudder shows that while the venation ismuch the same as in Hemerobius, as stat
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . as broad bejond the middle as nearthe base, the costal border convex in its outer half, with nu-merous and piominent cross-veins but no reticulations ; whenat rest, overlapping quite completely, even close to the base, LIBELLULID^. 597 much as in the Perlarice, and probably with the sides pro-tected near the base by the deflected marginal and scapular(subcostal) areas. Scudder shows that while the venation ismuch the same as in Hemerobius, as stated by Professor Dana,it also resembles that of the Sialidce, and Epkemerldoi andLibellulhhe. Gerstaecker thinks that Hemeristia at leaststands nearer to the Epliemeridm than to any other family.(Bronns Klassen und Ordnungen des Thier-Reichs, vol. v.) Latrcillc. Dragon-flies, Devils-darning-nee-dles, or Mosquito Hawks, are readily known by the enormoushead and thorax, with the remarkably long, slender, cylindricalabdomen. The head is large and globular, with immense eyesoften encircling the head. The large square thorax is remark-. able for the small size of the tergal parts, while the piecescomposing the flanks are greatly enlarged, rising up especiallyin front, taking the place of the prothorax, which is usuallyvery large in the Neuroptera generally, but is in this familygreatly aborted, as these insects scarcely ever walk. As inthe Ephemeridce the antenna are short and setiform, butthe mouth is furnished with palpi. The wings* are large, * Fig. 579. Venation of a lore wing of Goniphus. feins. — a, a, costal vein; b,subcostal vein ; c, c, median vein ; rf, subniedian vein; e, postcostal vein. Sectors--(branches springing from areas, veins, cross-veins, or other sectors), fff, princi-pal sector; g, nodal sector; h, subnodal sector; k, median sector; mm, short sec-tor; n, upper sector of the triangle (normally a prolongation of d); o, lowersector of the triangle (
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
