368 ON THE. PEDIPALPL OF NORTH AMERICA. 



bus nonnihil erenulatis; manibus modiee tumidis,. obsolete septemplicatis, marginibus antieis posti- 

 cisque tuberculatis ; pectimis dentibus 30 ; abdomine nonnihil ltuve, medio hand carinato ; spicule 

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

 B. emarginaticeps, Wood. Proc. Acad. Nat. Sci., 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. Krsutus 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. Mrsutus the description of one will answer 

 for the other. 



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



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



B. eusthenura. — B. aurantiaeo bruuneus ; dprso tubereulis minimis asperato ; ceplialotborace baud emar- 

 ginato, medio canaliculate ; oculis lateralibus utrinque in serie curvata dispositis ; palpis gra- 

 cilibus longis, longe sparse pilosis; manibus parvis, haud tumidis, subcylindraceis; cauda modiee 

 longa, pererassa ; spiculo brevissimo, valde curvato, sine spinulo basali: pectinis dentibus fere 17. 

 B. eusthenura, 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. punctipalpi. 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 crenulate. 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 B. 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. 



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



B. boretjs. — B. fulvus ; ceplialotborace antico baud emarginato ; oculis lateralibus in serie curvata 

 positis ; palpis modiee gracilibus, marginibus valde erenulatis ; manibus tumidis, brevibus, 

 liueis elevatis erenulatis 8 ; digitis nonnibil elongatis, curvatis ; abdomine medio nonnihil cari- 

 nata, fere laave; cauda nonnihil breye, deuticulata, spiculo sine spinulo basali ; pectinis dentibus 

 18 : lateribus dilute flavis. 



