366 ON THE rEDU'ALPI OF NORTH AMEUICA. 



liowevt'r, no .superior, and but ii single median interior crest. Its distal extremity is 

 furnished on its lower aspect with two curved series of denticules. One of these is 

 semi-elliptical ; the other semi-circular. The last joint is large. Its superior surface 

 is triangular, flat, or even depressed, and provided with well developed articular pro- 

 cesses. Its inferior aspect is somewhat tuberculate, and is furnished with two obsolete 

 grooves, and a row of denticules around its proximal extremity. 



Length of body c? f unc. 9 | tail c? | ? 4 unc. 



The only specimens that we have seen were collected in Cuba, by Mr. Wright, 

 and presented by him to the Academy. It is possible that this species is not a native 

 of the United States. As our description is drawn up from a tbreign specimen, we 

 append the original one of M. Gervais. 



'■ tScoi-jtivii rlc Lenaeur (*S'. Jjcsururti).'' 



'■ Troisieiiie j);uic d'ycu.v hitcraux sur hi uieme lii^ue (juu lus autres, plus petite ; ceplialotliorax 

 eohancrc en avant, lissee, ainsi que I'abdomen et le reste du corps sauf les carinas oaudales ; anneaux de la 

 quevie epais et courts ; une caienc medio laterale sur les premier, deuxi^me- et troisiemc et en rudimeut sur 

 la quatri^me ; une seule latero-supere au cinqu'ieme ; V('sicule plus grand que I'aiguillon, aplatie eu dessus, 

 rugueuse eu dessous; aiguillon subitement courbe ; une epine obtuse a sa base ; 8 dents au peignes ; main 

 cordiforme a doigts courts, rimmobile !c phis court; couleur fauve testac(5 en dessus et sous la queue ; dessous 

 de I'abdomen et pieds blonds; quelques poils au palpes, aux pleds et a la queue. Long, totale 0.050." 



BliTUUS EXILICAUHA. — B. dilute aurantiaco-brunneus, iuterdum obscure maculatus; dorso tuberculi.? 



parvis asperato; cophalotliorace antico late sed baud profundc cmarginato; palpis nunnihil 



gracilibus. subelongatis ; manibus parvissimis; digitis valde elongatis. gracilibus, curvatis ; cauda 



gracilc. uonnihil subelongata ; spiculo modiee longo. valde curvato, sine spinulo basali; pectiniw 



dentibus fere 1 8. 



B. cctlicuKiln, Wood. I'roc. Acad. Nat. Sci., April, iSIJo. 



The cephalothorax is medianally canaliculate, and anteriorly broadly but very 

 shallowly emarginatc. The latei'al eyes are arranged in a straight or neai'ly straight 

 series. The palpi have their surface quite rough, and are somewhat elongate and 

 slender. The second article has four minutely crenulated crests, besides minute tu- 

 bercles on its anterior face. The third has five ridges, besides larger tubercles on 

 its front surftice. The anterior aspect of the band is very convex. The posterior 

 border is ornamented by an obsoletely crenulate ridge. The opposing mai^gins of the 

 fingers are armed with obliquely longitudinal imbricated rows of minute teeth, with 

 a series of distant larger ones on either side. The caudal surface is rough. Tlie first 

 joint has very minutely denticulate superior, supero-, median-, infero-laternl, and in- 

 ferior ridges. The next three articles have the same crests, except the median lateral. 

 There are generally no distinct ridges on the penultimate segment. The last joint 

 is short, and very narrow, but quite thick. Its superior aspect is not complanate ; 

 its inferior is strunulv convex. The lower surface of the tail is generallv marked. 



o^ 



