86 Dr. E. Lonnberg on the Linnean 



p. 251) . Tlie small immbev of comb-teeth in Pocock's S. dic- 

 tator, namely nine to thirteen, seems perhaps to indicate its 

 identity with Linnsus's " S. africanus " (1754), which is 

 said to have twelve. The whole subject is, however, too 

 obscure, and besides, since binomenclature was not established 

 in 1754, there is no reason to alter Pocock's name. 



The two other scorpions dating from the time of Linnteus are 

 labelled by Thunberg " Mus. Lin.," which, according to the 

 catalogues, means that they belong to" Donatio Jonaj Alstro- 

 mer nee non Caroli a Linnc " from 1749 " et sequentibus 

 annis." As these specimens have not been described by 

 Linnaeus in any special separate publication, they have not 

 quite the same value. They are, iiowever, nevertheless very 

 important, as it is quite certain that they were seen and 

 studied by Linnaeus ; and it is possible that they are types 

 of the diagnoses in Syst. Nat., especially as no other 

 references are made. One of these is labelled by Thunberg 

 " europa'us.'^ It also perfectly agrees with the diagnoses 

 under that name in Syst. Nat. ed. x. and xii., and in Mus. 

 Ludov. Ulr. Reg. From this it appears almost certain that 

 this specimen is a type of Linna^us's " Scorpio euro/nvus " ; and 

 as it belongs to the species Isometrus maculatus (De Goer) ^, 

 this name should be chanc'cd to 



Isometrus europceus (Linnseus). 



This identification differs from the one proposed by 

 Thorell, 1876 (Ann. & Mag. Nat. Hist. (4) xvii. p. 8) and 

 1877 (/. c. p. 168), and he, as well as Kra3pelin (/. c), uses 

 the name given by De Geer. Both these authors put as the 

 Linna3an synonym to De Geer's " maculatus " " Scorpio 

 americus''^ (Linn. Syst. Nat. ed. x.). This can, however, 

 hardly be right, even if we leave the existing type specimen 

 for Scorpio em-opaus, Linn., out of consideration, for " Scorpio 

 americus, Lin.," is said to be provided with "pectinibus 

 14-dentatis," but Isometrus maculatus (De Geer) has (16) 

 17-19 comb-teeth. De Geer makes the same mistake f, but 

 quotes Syst. Nat. ed. xii. Liinu\3us's " Scorpio europceus " 

 from Syst. Nat. is regarded by Kra'pelin, and also pre- 

 viously by Thorell (/. c. pp. 1G3 and 165), as identical with 

 De Geer's {I. c. p. 343, pi. xii.) " Scorpio punctatus " and 



* For other synonyms see Kra^pelin, " Revision der Skorpione : I. Die 

 raui. d. Androctonidae," Jahrb. Ilamb. wiss. Aust. viii. (Hamburg, 1891) 

 p. 103. 



t ' Ilittoire des Insecte.-^," t. vii. 



