28 BUTHID.E. 



Genus BUTHEOLUS, Simon. 



Orthodactylus, Karsch, Berl. ent. Zeits. xxv, p. 90, 1881 ; Kraep. 



Jb. Hamb. iviss. Anst. vii, p. 215, 1891 (nom. preeocc). 

 Butheolus, Simon, Ann. Mus. Genova, xviii, p. 248, 1883; Pocock, 



P. Z. S. 1890, p. 121 ; Kraep. Tierr., Scarp, etc. p. 34, 1899. 

 Orthochirus, Karsch, Berl. ent. Zeits. xxxvi, p. 306, 1891. 



One or two teeth on the underside of the immovable mandibular 

 finger. Carapace without granular keels ; its frontal area sloped 

 downwards from the tubercle to the anterior edge ; area behind 

 the eyes with deep transverse groove. Tail very powerful, 

 generally posteriorly incrassate ; the vesicle very small, much 

 narrower than the 1st caudal segment. Sternum subpentagonal, 

 wider than long, shorter than the genital operculum. Chela' very 

 slender ; armature of fingers consisting of median rows of teeth 

 which do not overlap, an inner series consisting of single teeth, 

 aud an outer of teeth arranged in couplets. 



Type, B. tlialassinus, Simon. 



Distribution. Eastern Mediterranean area of Pala?arctic Region ; 

 shores of Red Sea ; Sokotra ; Western and North-western India. 



Synopsis of Indian Species. 



a. Tail not uniformly coloured, terga with lateral 



as well as median crest B. bicolor, p. 31. 



b. Tail uniformly coloured; terga with only a 



single median crest. 

 «'. Tail deep bluish green throughout ; trunk 

 usually the same tint as the tail, or, at all 



events, very deep brown B. melanurus, p. 28. 



b'. Tail uniformly pale yellow ; trunk at most 

 lightly infuscate. 

 a 2 . 4th segment of tail granular below, 5th 

 granular below posteriorly, 2nd aud 

 3rd granular and crested laterally ( <S ) . B. pallidus, p. 30. 

 b~. 4th and 5th caudal segments smooth 

 below ; 2nd and 3rd smooth, neither 

 crested nor granular laterally ( $ ) B.Jlavescens, p. 30. 



13. Blltheolus melanurus, Kessler, Trudni Russkago Ent. viii, p. 16, 

 1876 (Androctonus) ; Pocock, P. Z. S. 1890, p. 121 ; Kraep. Tier,:, 

 Scurp. etc. p. 35, 1899 (Butheolus) ; Birula, Ami. Mus. St. Petersb. 

 1*1)*, ]i. 281 (Orthocheirus) : schneideri, L. Koch in Schneider, Nat. 

 Beitr. Kaukasus, p. 61, pi. ii, fig. 4, 1878 (Pmthus) ; Pocock, Tr. Linn. 

 Soc. (2) Zool. v, p. 117, pi. xiii, t i^r. 2, 1889 (Orthodactylus) ; Kraep. 

 Jb. Hamb. wiss. Anst. viii, p. 215, 1891 (Orthodactylus). 



Colour: trunk and tail varying from blackish or deep reddish 

 brown to deep green : lower side of trunk paler ; chelae and legs 

 flavous, or with humerus and femora black ; brachium and patella 

 infuscate, pale flavous distally ; hands flavous, infuscate at the 

 base of the lingers ; pectines flavous. Carapace and terga thickly 

 granular, ocular tubercle and area just iu front of each median 



