368 ON THE PEDIPALPI OF NORTH AMERICA. 



bus nonniliil oremilatis ; manibus modice tnniidis, obsolete septemplicatis, niarginibxis anticis jiosti- 

 cisque t.uberculatis ; pectinus dentibus 30; abdomine nonnihil Ireve, medio hand oarinato ; spiculo 

 sine spinulo basali. (PI. 40, fig. 4.) 



B. emarginaticeps, Wood. Proc. Acad. Nat. Soi., April, 1863. 



The color of our single specimen is an olive yellow tint, with a very dark cres- 

 centic blotch at the position of the median eyes. But in this pattern it does not differ 

 from some individuals of the preceding species. The cephalothorax differs from that 

 of -B. hirsutus only in one character : In its anterior border is a very large emargina- 

 tion, which reaches about one-third of the distance to the median eyes. The abdo- 

 men is precisely like the preceding species. The tail is perhaps a little less massive. 

 But it also so closely resembles that of B. hirsutus the description of one will answer 

 for the other. 



Length of body, 1 finches; of tail, 21 inches. 



Ilab. — Lower California. J. Xantus de Vesey. Smithsonian Museum. 



Ji. F.USTHENURA. — 15. aurantiaco brunncus ; dorso tuberculis miuimi.s asporato; cophalothorace baud emar- 

 giuato, medio canaliculato ; oculis lateralibus utrinque in serie ourvata dispcsitis ; palpis gra- 

 cilibus longi.s, longe sparse pilosis; manibus parvis, baud tumidis, subcylindraeeis ; eauda modice 

 longa, percrassa ; spiculo brevissimo, valde curvatn, sine spinulo basali: pectinis dentibus fere 17. 

 /?. em/henura, Wood. Proc. Acad. Nat. Sci., April, 1863. 



The surface of the cephalothorax is rough and uneven. The hands are very small 

 and smooth, with some traces of the eight facets so distinct in B. punctipalpl. The 

 fingers are about as long as the hand, rather slender, with their opposing margins 

 armed with a row of very sharp, minute teeth, and much larger ones placed at in- 

 ■ tervals on one side of their distal portion. The legs are somewhat compressed ; very 

 long and slender. The tail, when compared with the body, is very heavy. On the 

 first four joints the superior and supero-lateral crests are alone serrulate. The supe- 

 rior terminates in a spine, feebly produced on the fourth article. The inferior and 

 infero-lateral crests are distinct, but not crennlate. The penultimate segment has 

 well-marked but not crenate, supero and infero-lateral ridges, besides a single median 

 inferior and median lateral on their proximal portion. The terminal joint resembles 

 that of 5. punctipalpi, but is much larger and thicker, and not so prolonged posterior- 

 ly. Sternal plate pentangular. 



Length of body, ji 7 lines : of tail, c? 13 lines. 



Hah. — Cape St. Lucas. J. Xantus de Vesey. Smithsonian Museum. 



B. BOREUS. — B. fulvus ; cepbalothorace antico baud emarginato ; oculis lateralibus in serie curvata 

 positis ; palpis modice gracilibus, marginibus valde crenulatis ; manibus tumidis, brevibus, 

 lineis elevatis crenulatis 8 ; digitis nonnibil elongatis, curvatis ; abdomine medio nounibil cari- 

 nata, fere Iteve; cauda nonnibil breve, deuticulata, spiculo sine spinulo basali ; pectinis dentibus 

 18; lateribus dilute flavis. 



