Annual report of the Board of Regents of the Smithsonian Institution . he body and itslonger side anterior to the apex (c). The base of the triangle is thehinge of the wing with the body; the apex represents the distal end ofthe third axillary sclerite (fig. 12, SAx), which carries the bases of thevannal veins; the point d on the anterior side of the triangle (fig. 14) 400 AXXUAL EEPORT SMITHSOXL\X IXSTITUTIOX, 192 9 marks the articulation of the radial vein (fig. 12, R) with the secondaxillaiy sclerite {2Ax). The role that the axillary triangle plays in thefolding of the \\dng will be discuss
Annual report of the Board of Regents of the Smithsonian Institution . he body and itslonger side anterior to the apex (c). The base of the triangle is thehinge of the wing with the body; the apex represents the distal end ofthe third axillary sclerite (fig. 12, SAx), which carries the bases of thevannal veins; the point d on the anterior side of the triangle (fig. 14) 400 AXXUAL EEPORT SMITHSOXL\X IXSTITUTIOX, 192 9 marks the articulation of the radial vein (fig. 12, R) with the secondaxillaiy sclerite {2Ax). The role that the axillary triangle plays in thefolding of the \\dng will be discussed in Section IV of this paper. The area of the wing distal to the axillary region comprises the threeparts of the wing separated by the vannal and jugal folds (fig. 10 B,ij, jf), when these folds are present. The area anterior to the vannalfold (fig. 14, Rm), containing the costal, subcostal, radial, medial, andcubital veins (fig. 10 B), is the part of the wing chiefly productive of themovements of flight, since it is directly afiected by the motor-wing C Sc R M Rm. 2Cu ^V iCu vf A Sc R+M iCu 2Cu M Re C R.
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
