ON THE PEDIPALPI OF NORTH AMERICA. 369 



Scorpio (Tetegonus) boreus, Girard, Marcy's Report, p. 257, pi. 17, fig. 5—7 [partim.] 



The surface of the cephalothorax is much less granular and with a less strongly 

 pronounced median keel than in B. carolinianus. The median eyes are anterior 

 to its middle. The lateral ocelli are arranged in the form of arcs, with their 

 convexity looking forwards and outwards. Overhanging them is a pair of tumid 

 swellings. The proximal three joints of the palpi are irregularly parallelopipedal, 

 with their angles well marked and denticulate. The proximal portion of the inner 

 surface of the third has several small tuberculoid spines similar to but larger than 

 those of B. carolinianus. The hand is considerably larger than in that species. It 

 is marked with eight raised, faintly crenulate lines, which separate as many facets. 

 The fingers are somewhat elongate and rather stout. Their opposing margins have 

 a wavy outline, and are armed with a continuous series of minute teeth, with larger 

 ones anterior to them. The anterior joints of the tail are very short. The furrow 

 on the superior surface is deeply excavated. The first four articulations are fur- 

 nished each with two denticulate or strongly crenulate superior and supero-lateral 

 crests. The median lateral exists only in a well marked degree on the first ; it also 

 is denticulate. Each of the four has two infero-lateral and two inferior ridges. 

 These are often illy pronounced and not crenulate. The penultimate articulation 

 has two superior and infero-lateral and a single median inferior raised line. Some- 

 times the rudiments of the .supero-lateral also exist. The sting is long and slender. 

 The legs are strongly compressed and pilose. The sternal plate is pentangular. 

 The specimen referred to by Mr. Girard as coming from Eagle Pass we have exa- 

 mined, and do not think identical with this species. 

 Hah. — Utah. Smithsonian Museum. 



B. punctipalpi.— B. aurantiaco-brunneus ; dorso tuberculis minimis asperato ; cephalothorace medio 

 canalicular, antico nonnihil emarginato; palpis dense minutissime punctatis, nonnihil robustis ; 

 manibus magnis, tumidis, octo faciebus indistincte instructis; cauda modice longa et crasse ; articulo 

 penultimo longo ; ultimo parvo, supra complanato ; spiculo gracilimo, valde elongate, gradatim 

 curvato, sine spinulo basali ; pectinis dentibus fere 20. 

 B. punctipalpi, Wood. Proc. Acad. Nat. Sci., April, 1863. 



All of our specimens are immaculate ; some of them shade off in color towards 

 an olive. The lateral eyes, three in number, are generally arranged in a slightly, 

 but occasionally in a strongly curved line. The cephalothorax, and, indeed, the 

 whole dorsum is roughened by very numerous minute tubercles. The scuta are 

 more or less distinctly medianly keeled. The joints of the palpi are irregularly 

 parallelopipedal, with their margins mostly well defined and crenulate. The second * 

 joint has on its anterior face one or two crenate ridges ; its posterior margin is 



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