132 Mr. B. P. Uvarov—J. Revision of 



reason to treat as such the first species mentioned by Geoffroy, 

 which, quite incidentally, happens to be Locusta gertyianica, 

 Koesel { = Sphingonotus coerulans, L.), as is suggested by 

 Sjostedt (K. Sven. Vet.-Akad. Handl. Ixii. No. 3, pp. 256- 

 257, 1921). On the other hand, Fabricius (Syst. Eiitoni. 

 p. 278) in 1775 restricted the genus Acrydium to only two 

 of the species mentioned by Geoffroy, viz. bipunctatum and 

 subulatunij while he separated all other short-horned grass- 

 hoppers into the Liunean genera Tryxalis and Gryllus. The 

 same two species are mentioned by Latreille (Hist. Nat. 

 Crust. Ins. iii. 1802, p. 284) as ''^exemples/' i. e., types of* 

 his genus Tetrix, which makes this name a pure synonym 

 o^ Acrydium (Geoffr.), Fabr.* 



It was Serville who in 1831 first applied Geoffroy's name 

 Aery dium, w\\\ch. he corrected into Acridium, in an altogether 

 different sense, while he included in his genus under that 

 name several larger species of short-horned grasshoppers 

 with armed prosternum (Ann. Sci. Nat. xxii. p. 282) ; the 

 genotype was not indicated. Serville^s conception oi Acry- 

 dium (or Acridium^ which is, of course, the same word 

 differently spelt) has been, most unfortunately, adopted by 

 all subsequent authors of standard works on Orthoptera 

 (Burmeister, Stal, Brunner v. Wattenwyl, etc.), while 

 Acrydium (Geoffr.), Fabr., has been quite incorrectly replaced 

 by Tetrix^lj^iv. Kirby in 1890 (Scient. Proc. E. Dublin Soc. 

 p. 592) restored the correct interpretation of the genus 

 Acrydium (Geoffr.), Fabr., and this has been accepted, 

 especially after the publication of his Catalogue, by many 

 authors, but some of them are still using the name in 

 Serville's sense. Prof. Sjostedt recently proposed to use 

 both names- — Acrydium^ Geoffr,, for TetrioCy Latr., and Acri- 

 dium, Serv., for certain members of Catantopinse ; but this 

 opinion, based upon a different Latin transliteration of the 

 same letter in the original Greek word, cannot be accepted f ; 



* A definite fixation of the single g-enotype of Acrydium (Geoffr.), 

 Fabr., was made in 1815 by Leacb (Edinb. Encycl. ix. p. 120), who quotes 

 under it A. suhulatvm oul3\ Later on, in 1833, Curtis (Brit. Ent. x. 

 ])1. 439) formally indicated bipimctatum as the genotype of ^ cry t/mm, but 

 it makes no difference in the conception of the genus, as the two species 

 are congeneric. 



t It may be mentioned also that Serville himself in his next book 

 (Mist. Nat. Ins. Orth. 1838) wrote the name as Acrydium (p. 640), while 

 in the descriptions of species on the succeeding pnges (pp. t)42, 643, etc) 

 he spells it Acridium, which makes it quite clear that he did not mean 

 to desci'ibe a new genus, but simply used Geoffroy's generic name in a 

 different sense. 



