ON THE PEDIPALPI OF NORTH AMERICA. 3U 



last is Uiree-sided, and is protected by six denticulate linos, so placed as to form triangles 

 with one another, as in B. caroUnianiPi. The median keel is more or less crenulate. The 

 first four joints of the tail are furnished with the usual superior, supero and infero-lateral 

 and inferior crests. They are minutelj' serrulate. The first joint has a well-marked 

 median lateral raised line; the second the rudiments of it. The fifth articulation is 

 the longest, and has the ridges obsolete. The last joint is small, and is furnished with 

 a rudimentary spine at the base of the sting. The palpi are rather slender, but their 

 crests are strongly pronounced and crenulate. Their inner surface is furnished with 

 small, thick; tuberculoid spines. The hands are rather small, with several obsolete 

 crests. The fingers are nearly twice as long. Their opposing margins are armed 

 with median, oblique, imbricated rows of minute teeth, with a series of larger ones on 

 either side. This species is very closely allied to the preceding, and very possibly 

 may prove identical with it. We have seen only the type of Mr. Girard's description. 

 It appears to differ from B. carollniamis, in the greater roughness of the body, in 

 the more strongly marked denticulate crests of the tail, in the maxillary palpi having 

 their inner surface more spinous, and their ridges more crenulate, and finally in the 

 color. 



Hah. — California. 



B. LESUEURii. — B. bvunneus ; cephalothoracc antico distincte eniarginato, medio valde canaliculato, 

 utriuque postice sulco ourvato ; oculis lateralibus iu serie fere recta dispositis ; palpis gracilibus, 

 tuberculatis, sed vix earinatis et Cauda manibusque et venuste politis et auranticis et leviter pilosis; 

 illis valdissime tumidis, subcordiformibus, euormiter areolatis ; digitis brevibus, robustis, uigro-fuscis, 

 curvatis, marginibus opponentibus indistincte denticulatis; abdomine miuutissime granulato, baud 

 carinato; pedibus flavis, compressis ; cauda breve, crasse ; cristis valde crenulatis, interdum denticu- 

 latis ; articulo ultimo magno, spiculo parvo sed spinulo basali armato ; pectinis dentibus 8. 



B. ksucurii, G-ervais, Archiv. Mus. vol. iii. p. 226, pi. xi. fig. 27-29. Aptercs, vol. iii. p. 61, 62. 



The cephalothorax of this elegant scorjjion has its surface polished, but very mi- 

 nutely granulate. The median furrow is very strongly pronounced. Posteriorly, on 

 each side, there is a sulcus so curved that the inner portion of it is longitudinal, but 

 the outer transverse. The crests of the palpi are not all well marked. The hands 

 are furnished with but one raised line. This placed on their posterior border, 

 although well pronounced, is not at all crenulate. The caudal joints are both broad 

 and very short. Their superior surface is deeply sulcate. A more or less forcibly 

 crenulate or denticulate median lateral crest exists on the first three; sometimes 

 feebly pronounced on the third ; rudiments only on the fourth and fifth. The first 

 four joints are all provided with superior, supero and infero-lateral and inferior crests. 

 The supero-lateral commences by a broad, thin, but not denticulate articular process. 

 The penultimate segment has supero and infero-lateral ridges as in the others. It has, 



