This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...The veins involved include members of the radial, medial and anal series in the fore-wings and the medial, cubital and anal series in the hind-wings. The variation in the radial series consists of a "continuous" variation on the part of Ra. This summary included 46 left and 43 right wings which were ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...The veins involved include members of the radial, medial and anal series in the fore-wings and the medial, cubital and anal series in the hind-wings. The variation in the radial series consists of a "continuous" variation on the part of Ra. This summary included 46 left and 43 right wings which were perfect and available for study. R3 is present and normal in 27 of the 46 left wings and in 22 of the 43 right wings. Rs is entirely absent as a separate branch in 29 of the 46 left wings and in 21 of the 43 right wings; Rs is present in part of its length in three wings as follows: (a) as a very short branch originating typically but ending freely in cell R2 % of its length from the costal margin, in I left wing (specimen Sub. 4, I); (b) as in above under (a) but twice as long in I left wing (specimen Sub. I, B); (c) in three sections, a basal, a terminal, and a middle section lying freely in cell R2 in I right wing (specimen Sub. I, R). The variations in the anal series of the fore wings affect the first and third anal veins. In the case of the first anal vein, the variations in 95 wings may be summarized under the following four classes: (a) 4 right and 5 left wings in which there is not a trace of the vein; not even a fold, furrow or surviving trachea; (b) 39 right and 33 left wings in which there are faint traces of a thickening or a faintly defined vein distally and not extending for as much as J4 the total length of the vein; (c) 5 right and 2 left wings in which as much as the distal half of the vein is present as a vein, fold, furrow, thickening or trachea or any combination of these; (d) I right and 3 left wings in which the distal y2, y$ or of the vein is present as a vein. In no case is the vein found present in its entire length....
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