The wings of insects; an exposition of the uniform terminology of the wing-veins of insects and a discussion of the more general characteristics of the wings of the several orders of insects - Tapa blanda

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...longitudinal line: "a) The radial planate traverses the interradial area, crossing the branches of the radial sector, in the direction of the wing apex. See Figure 202. "b) The trigonal planate traverse the area of the trigonal fork, crossing and uniting the branches that spring from the trigonal vein, to which vein it is more or less closely parallel. The trigonal planate is more or less closely joined at its proximal end to the trigonal arc. "8. A median nexus or conjunction of adjacent veins, joins the tip of vein M1+2 with the vein on each side of it, and an interradial nexus in the more specialized Palparinae similarly joins the tip of the first and second branches of the radial sector. (5) THE WINGS OF THE ASCALAPHIDS Although the family Ascalaphidae is distinctly separated from the Myrmeleonidae, the wings of ascalaphids resemble quite closely those of the myrmeleonids. The only feature that sharply distinguishes the wings of ascalaphids from those of myrmeleonids is the fact that in the Ascalaphidae there is no greatly elongated cell behind the point of fusion of veins Sc and Ri. In the Ascalaphidae, the obliquity of the base of vein M3+4 is frequently not well-marked; it is obvious in Ululodes hyalina (Fig. 203, o), but in. Ogcogaster tesselata (Fig. 204) it is less so. In this family the radial cuneate area is always present, although in a few cases, as in the genus Paer, it is small. It is in nearly all cases irregular in form, as in Ululodes (Fig. 203), appearing to be behind the first branch of the radial sector; rarely it has the appearance of being between two forks of the first branch of the radial sector. One of the best examples of this is in the wings of Ogcogaster tesselata from India (Fig. 204). In the hind wings the medi...