Scorpions of the Genus Ileteromctrus. 365 



smoothness of the inferior keelson the last abdominal and first 

 caudal segments, the spine-armature of the tarsi, &c. 



The known species may be tabulated as follows : — 



n. Keels of last abilniuiiml sternum and of underside of 



first caudnl segmeut sniootli ( 9 ) Boehnii, 



b. Keels (if last abdominal sternum and of underside of 



first caudal seirnient coar-elv irrannlar (d" $)• 



a'. (lenital oiMTCuhim divided ; ter^aand stenm finely 



granular ur sha;ireenod ( J ). 



a^. iland in adult wider than length of carapace, 



distinctly crested above ; immovable fin^^er short, 



triangular; a crest on underside of brachium 



behind; tail thick, fifth segment less than 



twice as long as wide, tiiird as wide as or wider 



than long manrus. 



b^. Hand narrower than length of carapace, not 

 visibly crested above ; immovable finger long ; 

 no crest on underside of brachium ; tail narrow, 



third caudal segment longer than wide palmatus. 



b\ Genital operculum undivided ; terga and sterna not 

 shapreened ( $ ). 

 a^. Third and fourth caudal segments with inferior 

 keels strong and granular. 

 a\ Median eyes small, vesicle not inflated. 



«'. Genital operculum much wider than long, 

 transversely elliptical; lower side of bra- 

 chium with distinct smooth crest behind ; 

 hand more strongly granular and keeled, &c. tnaiirus. 

 A'. Genital operculum heart-shaped, as long or 

 nearly as long as wide ; lower side of bra- 

 chium evenly rounded behind ; hand less 



Coarsely granular and crested fusctis. 



/;'. Median eyes large ; vesicle expanded propiuquus, 



lA. Inferior keels of third and fourth caudal segments 

 smooth, only uneven with setal pores ; median 

 eyes large. 

 «". Hand witli a pair of strong smooth finger-keels, 

 and ornamented above with a distinct net- 

 work of smooth ridges ardhicuf;. 



6". Hand almost smooth above, scarcely visibly 



sculptured ; its crests obsolete Toicnsetuti. 



N.B. — Attention must be drawn to the omission from the 

 * Ticrrcich ' of the followino; names which have been a|)j)Iied 

 to various forms of the genus Ileterometrus : Jlavus, 7'ufus, 

 fuscus, and minor. Apart from the possibility that these 

 forms may in future take rank as distinct species, tlie re- 

 cording of such names is necessary to prevent their apj)lica- 

 tion to new .sspecics by students who have no opportunity of 

 consulting all the literature of the subject and look to a work 

 of the aspirations of the ' Tierreich ' to supply at least a 

 complete list of the names that have been employed in each 

 genus. 



