ON THE PEDIPALPI OF NORTH AMERICA. 367 



with a median longitudinal stripe. The sternal plate is triangular, with its apex 

 truncate. 



Length of body, d' 7 lines, ? 8 lines: of tail, c? 13 lines, ? 12 lines. 



Rab. — Lower California. Museum of Smithsonian Institution. 



B. hirsutls. — B. brunneus : palpis, pedibus caudaque dilute aurantiacis, longe pilosis; cephalotho- 

 race lato, margine antico non solum baud euiai'ginato sed etiam couvexo ; oculis lateralibus in serie 

 valde curvata dispositis; palpis crassibus, rnarginibus nonnihil crenulatis ; manibus modice tu- 

 niidis, obsolete septernplicatis, marginibus posticis anticisque tuberculatis ; digitis valde elongatis 

 robustis, curvatis, obsoletissime plicatis ; pectinis dentibus 25 — 30 ; abdoininc nonnibil \se\e, haud 

 carinato ; spiculo sine spinulo basali. (PI. 40, fig. 1, la, lb, lc.) 

 B. Mrsutus, Wood. Proc. Aead. Nat. Sci., April, 1863. 



The common tint of the dorsum is a very dark reddish-brown, but it varies greatly, 

 in some specimens being as light as the legs, in others even olive. In the typical 

 pattern, whilst the penultimate caudal segment is of the same reddish-brown as the 

 body, the terminal is very light. The cephalothorax is broad, and has its surface mi- 

 nutely granulate. The median furrow is strongly pronounced, and is intersected by 

 three transverse ones. The most anterior of these crosses it at the position of the median 

 ocelli ; the most posterior just in front of the hinder margin. Rarely these are some- 

 what obsolete, and sometimes they are slightly oblique. The opposing edges of the 

 lingers are armed with obliquely longitudinal imbricated rows of small teeth, with a 

 series of larger distant ones on each side. The surfaces of the abdominal scuta are 

 quite smooth, but their posterior borders are tuberculate. Anteriorly they are im- 

 pressed with two crescentic linear furrows. The legs are compressed and hairy ; their 

 edges are more or less crenulate. Tae tail is long, massive, rough and very hairy. 

 At the proximal end of each of the first four joints, there is a pair of broad, thin, mi- 

 nutely denticulate articular processes. On the distal extremity of the fourth there is a 

 nondenticulate pair. The superior, supero and median lateral crests of the first four 

 articles are strongly but irregularly crenate. The median is evanescent, on each, an- 

 teriorly. The inferior and infero-lateral ridges are smooth on the two anterior joints, 

 on the third they are slightly, on the fourth distinctly crenate. The supero and me- 

 dian lateral crests of the penultimate segment are strongly crenulate ; the infero lat- 

 eral and median inferior strongly denticulate. The last joint is short, swollen and 

 very hairy. Its articular processes are large, but not dentate. Its superior surface is 

 triangular, smooth and complanate, or even depressed ; its inferior is tuberculate, and 

 traversed by two grooves on each side. 



Length of body, It inches: of tail, 2s inches. 



Hab. — California. J. Xantus de Vesey. Smithsonian Museum. • 



B. E.MAKGlNATlCEPS. — B. olivaceo-fulvus ; palpis, pedibus caudaque longe pilosis ; cephalothorace antico 

 late et profundissinie eniarginato, sed alibi. 1J. hirsuti illo simillimo ; palpis crassibus; martini 



