ACEIDIIDJL 



Subfam. TETTIGINjE. 



This group of locusts, in consequence of the diminutive size, dull colouring, and 

 inconspicuous habits of its members, has long been neglected by collectors and 

 systematists alike. Very few specimens find their way into collections, and, in 

 consequence, they are exceptionally difficult to separate into species. In many cases 

 differences in structure of the most obvious character formerly regarded as indicative 

 of specific distinctness and used in description have been discovered to be of little or 

 no value ; on the other hand, the gradation of forms is so close, and the systematic 

 differences between them in many groups so slight, that individual variation encroaches 

 largely on specific characters. When in addition to these factors we encounter also 



the hind margin rarely rectangulate or suhrectangulate, generally obtuse, the median 

 carina not cristate ; sulci of the prozona either obliterated or interrupted on the disk, the 

 posterior of these not or but very slightly recurved, never confluent with the principal 

 sulcus (i. e. that separating, the prozona and metazona) ; lateral lobes generally narrowed 

 in passing downward, rarely longer than deep, with parallel anterior and posterior margins ; 

 tegmina generally lacking the intercalary vein, the anal and axillary veins generally united 

 at a greater or less distance from the base ; arolia generally of medium size or large ; 



metasternal lobes not or but slightly separated Trtxaliios. 



Fastigium of vertex generally strongly declivous, slightly or very slightly prominent ; front not 

 or very slightly oblique, generally vertical or subvertical ; eyes generally small or rather 

 small, rarely a little longer than the infra-ocular portion of the genae ; antennae linear or 

 sublinear, generally inserted above the middle of the eyes, sometimes almost above the eyes 

 themselves (" plerumque ante medium, interdum fere ante oculos "). Pronotum furnished 

 with a median carina often wholly or partly cristate, the metazona typically longer than the 

 prozona, the hind margin generally rectangulate or suhrectangulate, the sulci of the prozona 

 either interrupted or the anterior sulcus alone continuous and bisecting the carina or crest, 

 rarely both continuous, the posterior sulcus recurved and frequently confluent with the 

 principal sulcus ; lateral lobes transverse (*'. e. longer than deep) or subtransverse, the front 

 and hind margins parallel or subparallel ; tegmina generally furnished with an interealary 

 vein, the anal and axillary veins frequently running free to the margin ; hind femora 

 generally broad, and above and below compressed ; arolia small ; metasternal lobes generally 

 somewhat distant (Edipodinae. 



To this may be added also the following from Brunner v. Wattenwyl (Rev. Syst. Orthopt. p. 102, nota) : — 

 The distinction between the Tryxalinae and (Edipodinae is somewhat arbitrary and rests on individual 

 perception (" l'estimation personelle "). When, however, the relative position of the front and the vertex (on 

 which he rests his tabular distinction) leaves one in doubt, the presence or absence of foveolae may guide one — 

 Tryxalinae having in this case very distinct foveolae, while in the (Edipodinae they are effaced. Moreover, the 

 species here taken into consideration, when they are Tryxalinae have the mediastinal and scapular areas of 

 the tegmina regularly reticulate by transverse veinlets ; while if they are (Edipodinae these areas are always 

 very irregularly reticulated. 



Bb2 



