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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



like wing region between the anal and jugal plicae might appropriately 

 be called the vannus (Latin, fan), and its veins termed the vannal 

 veins. This region plays a passive part in flight. The pre-vannal part 

 of the wing is the true remigium (Latin, oar) of the flight mech- 

 anism, being the region of the wing directly productive of motion. We 

 might then say that the area of the wing distal to the basal axillary 

 region is divided into a remigial, a vannal, and a jugal region. The 

 separating folds, when present, would then become the vannal and 

 the jugal plicae. The jugal region expanded is the neala of Martynov. 



R M 



Fig. 46. — Wings of an acridid nymph. (From Comstock, after Comstock 

 and Needham.) 



A, fore wing. B, hind wing. The tracheal identifications as given by Com- 

 stock and Needham: lA, first anal; Cti, cubitus; M, media; R, radius; Sc, 

 subcosta. 



In the hind wing (fig. 45 B) the costa (C) forms the anterior 

 margin of the wing and is united basally with the subcosta (Sc). 

 The base of the subcosta (fig. 47 B, Sc) does not reach the first 

 axillary sclerite (lAx), evidently by reason of the reduction of the 

 anterior process of the latter, neither does it articulate with the pre- 

 scutal lobe of the tergmn (fig. 22 A, n), but it is connected with the 

 latter by a ligament-like thickening of the wing membrane (fig. 47 B, 

 d). The radius (R) is well developed, branched distally, and con- 

 nected basally with the second axillary (fig. 47 B, 2Ax). The ap- 

 parent media is united proximally with the radius ; its free part con- 



