the Old World C yrtacantJiacrini . 133 



still less convincing is Sjostcdt^s proposition to regard 

 ruficornis as the genotype of Ao'idiiim, Serv., on the false 

 principle that the first species mentioned nndcr the genus is 

 the genotype. 



It is ohvious, therefore, that there has been no acceptable 

 name for the genus described by Serville under the 

 preoccupied name Acridiu/n, until Walker (Cat. Derm. Salt. 

 Brit. Mus. iii. p. o50) established in 1870 the genus Cyrta- 

 canthacris , which partly covered Acrid'mm, Serv. ; the geno- 

 type of Cijrtacanthacris was fixed only in 1910 by Kirby 

 (Cat. iii. p. 4X6), as GrijUus Locusta ranaceiis, Stoll, which 

 is conspccific with Gryllas Locusta tartaricus, L. (see below) . 

 Walker's name, however_, has never been recognised by 

 other authors. 



The next genus of the group described was Schisfocerca, 

 Stal (Rec. Orth. i. p. 64, 1873), established as a subgenus 

 of the genus Acridium, Serv., to include Acridium pere- 

 gr'uium^ Oliv. [=.GryUus gregariiis^ Forsk. ; see below), and 

 its American allies. There can be hardly any doubt as to 

 the genotype of this genus, though it was formally fixed 

 only in 1910 by Kirby (Catalogue, iii. p. 454) as Gryllus 

 -Locusta tartaricus, L., which he incorrectly (see below) 

 applied to Gryllus gregarius, Forsk. 



1. Bolivar in 1889 (Jorn. Sci. Lisboa, i. p. 163) founded 

 another new genus of the group, Acridoderes, with a single 

 species A. crassus, which thus automatically becomes the 

 genotype, but several other species described by the same 

 author under that generic name later on do not belong to 

 the genus. 



In 1896 Karsch (Stett. Ent. Ztg. Ivii. p. 303) established 

 the genus OrtliacantJiacris^ again for a single species, O. 

 humilicrus, Karsch, which is therefore the genotype. As, how- 

 ever, he did not give a proper description of the genus, the 

 latter has been interpreted by subsequent writers incorrectly. 

 Thus, Karny (Sitz. Akad. Wiss. Wieu, cxvi. 1907, p. 304) 

 included in the subgenus Orthacantfiacris of the genus 

 Locusta ^, besides humilicrus, mocsta of Serville (described by 

 him as wernerelki), which is clearly not congeneric with it. 

 A still more vague and indefinite conception of the genus 



* lie followed the incorrect conception of tlie genus Locusta advanced 

 by Kiaus8, who worked on the false principle of elimination and fixed 

 Gryllus Locusta tartarica, L., as the genotype o^ Locusta in 1902, although 

 the genotype had been fixed as early as 1815 by Leach as G. Locusta 

 miffratoria, L. (see my paper on the genus Locusta, L., in Bull. Ent. lies, 

 xii. 1921, p. 136). 



