406 ABACHKIDA OF LAKE URMI. 



height, its height b:!ing much less than the width of the upper surface 

 of the 5th caudal segment a,nd only a little more than half the length 

 of a straight line drawn from the outer side of the base of the aciileus 

 to its point ; the aculeus is very long aud lightly curved, its length 

 represented hy a straight line, drawn as described above, considerably 

 exceeding the width of the 5th caudal segment, exceeding also the length 

 of the vesicle, equal to half the length of the movable digit and to the 

 distance between the anterior edge of the median eye and the posterior 

 border of the carapace. In B. vesiculatus, on the contrary, the vesicle 

 (PL 26. fig. 4) is large and globular, the height exceeding the width ; 

 the aculeus is short and more strongly curved, its length represented by 

 a straight line drawn as above being much less than, not much more than 

 half, the length of the vesicle, less than the width of the 5th caudal 

 segment, about one-third the length of the movable digit, and much less 

 than half the length of the carapace. 

 Pectinal teeth 20 in $ , 25 in (S . 



2 . Total length 55 mm. ; length of carapace 65, of tail 33 ; height of 

 vesicle 3, width 2-8 ; length of aculeus 2-5. [In type (2) oi£. partharum 

 the measurements, in mm., are : — Total length 74, carapace 8, tail 44 ; 

 height of vesicle 2'5, width 3 ; length of aculeus 4-6.] 

 Loc. Astracau, in Persia. 



There are three examples of this species in the British Museum : two, 

 2 ad. and J inimat., from the above locality, and 1 2 ^^- ™ bottle 

 without locality but containing other tj'pically Eastern Mediteri'anean 

 specimens of Arachnida and Chilopoda. 



Prof. K. Kraepelin (Das Tierr., Scorpiones, p. 24, 1899) cites B. par- 

 thorum as doubtfully synonymous with B. caucasicus, Nordman (DemidoflT, 

 Voy. Russie, iii. p. 731, Arachn. pi. i. fig. 1 , 1840). Judging by Kraepelin's 

 description of the latter species, the two are certainly allied ; but since 

 nothing is said about the form of the caudal vesicle and aculeus, there is 

 at present no certainty on this point. In any case the name caucnsicns 

 cannot stand for the species, since it was previously used by Fischer, as 

 Birula has shown, for another species of Biithus. Hence, if caucasicus, 

 J^o:d.=2^arthorum, Pocock, the latter will be the name for the species. 



EXPLANATION OF PLATE 26. 



Fig. 1. Li/cosa Giientheri, sp. n. Dorsal view, (^ . 



1 a. „ „ Palp of c5'. 

 15. „ „ Vulva of 5. 



2. Galeodes trucidentus, sp. n. 2 > i^^t. size. 



2 a. „ „ Flagellura of c? . 



3. Buthus parthonim, Poc. Vesicle and aculeus of tail. 



4. ,, vesiculatus, sp. n. ,, „ 



