XII 



ACRIDIIDAE 



281 



sort of embrasure filled up by a portion of the first ventral plate. 

 The hind body is elongate, and shows distinctly eight dorsal 

 segments, behind which are the 

 pieces forming in the female, the 

 fossorial organs which replace an 

 ovipositor in the male, the modi- 

 fied parts connected with the ter- 

 minal segment. The alar organs 

 (Fig. 167) exhibit, according to 

 Brunner, the same areas as we 

 have described in Blattidae. Ac- 

 cording, however, to Eedtenbacher ^ 

 the tegmina of the Acridiidae and 

 other saltatorial Orthoptera differ 

 from those of the cursorial group 

 (with the exception of the Phas- 

 midae) in that they possess a 

 praecostal field, due to the fact 

 that the A^ein which in the Cur- 

 soria is costal, i.e. forms the front 

 margin, in the Saltatoria lies, on 

 the contrciry, in the field of the 

 wing. If this view be correct the 

 mediastinal area of Brunner is not 

 homoloo-ous in the two divisions. 



Fig. 16 



Alar organs of Acridiidae 

 {Bryodema tuherculata). A, Left 

 tegnien ; B, left wing : ar.m^d, area 

 mediastiua ; ar.sc, area scapularis ; 

 ar.disc, area discoidalis ; ar.an, anal 

 area ; v.vi, vena niediastina ; v.r, 

 vena radialis ; v.r. a, vena radialis 

 anterior ; v.r.m, vena radialis media ; 

 v.r.p, vena radialis posterior ; v.i, 

 vena intercalata ; v.u.a, vena ulnaris 

 anterior ; v.u.p, vena ulnaris pos- 

 terior ; v.d, vena dividens ; v.jol, vena 

 plicata. (After Brunner.) 



The tegmina are long and 

 comparatively narrow ; they are of firm parchment-like texture, 

 with several longitudinal veins, which divide beyond the middle, 

 so as to become more numerous as they reach the extremity of 

 the wing ; there is much reticulation, dividing the surface into 

 numerous small cells. The hind wings are much more ample, 

 and of more delicate texture; the longitudinal veins fork but 

 little, the numerous cross veinlets are fine. In repose the hind 

 wings fold together in a fan-like manner, and are entirely con- 

 cealed by the upper wings. The front and middle legs are 

 similar and small, the coxae are quite small, and do not com- 

 pletely fill the articular cavities, which are partly covered by 

 membrane ; all the tarsi are three-jointed. The basal joint, when 

 looked at beneath, is seen to bear three successively placed pads, 

 so that from beneath the tarsi look as if they were five-jointed 

 1 Ann. Hofmus. Wien, i. 1886, p. 175. 



