— 375 — 



ab antico margine remoti, parvi; oculi laterales principales 

 terni, a margine ceplialothoracis spatio distincto separati. 



Stermini siib-pentagonum, anteriora versus angustatum, po- 

 stice in angulum obtusum incisum, antice (sed non postice) 

 ìobis labialibiis 2.' paris conjunctis aiigiistiiis, postice latius 

 quam longiiis. 



Sj)iracula angusta, 3.^'° - 4,p'° longiora qiiam latiora. 



Cauda mediocris, saltem basi subter carinata; vesica, qiise 

 siilcis et grannlis in series ordinatis siibter caret, dente sub 

 aculeo caret quoque. 



Mandibulse magnae; digitus eorum mobilis in margine su- 

 jjeriore dentibiis 5 armatus est, in margine inferiore muticus 

 vel modo granulo uno alterove minuto praeditus; niargo interior 

 digiti immobilis muticus quoque. 



Palporum niaiius lata et crassa, maini a versa sub-infera 

 extus (supra) costa distinctissima ad medium baseos digiti mo- 

 bilis ducta limitata. 



Pectines breves, lamellis iiitermediis paucissimis, in lamiiiam 

 oblongam triangulam coalitis. 



Tarsi apice integri (i. e. non in lobos duos fissi). 



Typus: 0. phceodactylus (Wood). 



Ab Uroctono^ cui generi a Karscli (1) et a Marx (2) subji- 

 citur Centrurics phaiodactylus^ "Wood, margine inferiore digiti 

 mobilis mandibularum non evidenter dentato, spiraculis longis 

 et angustis, lamellis intermediis pectinum paucissimis, maiiu 

 palporum inflata, cet., differt liic scorpio. 



18. O. phaeodactylus (Wood). 



Syn. 1863. Centrurus phaiodactylus, Wood, Observ. cu the Pedipalpi of 

 North America, loc. cit., p. 372, PI. 40, fig. 8 et 



B' (= cT). 



(1) Scorpionol. Beitr., II, 2, loc. cit. p. 102 et 103. 



(2) Procced. of the Entom. Soc. of Washington, I, p. 91. 



