ON THE PEDIPALPI OF NORTH AMERICA 361 



medium size. The second* joint has all of its borders, except the postero-inferiqr, 

 crenulate. The third has only its supero-anterior crenate. Its anterior 1 face is 

 complanate ; its posterior convex. The hands are rather thin, somewhat cordate, 

 subquadrangular, and faintly marked with divisions between eight facets. The 

 anterior border is thin and convex. The fingers are very robust, almost rudely 

 punctate, rather short, and ornamented with a few long hairs. Their opposing mar- 

 gins are minutely denticulate. The tail is short ; in the female not so long as the 

 body. The first joint is broader than long. It has both the superior and the supero- 

 lateral crests crenulate. The third and fourth have the infero-lateral also distinctly 

 crenate. The inferior crests are crenulate on the fourth. The penultimate joint is. 

 elongate; its lower surface is tuberculate; its single median inferior and infero-lateral 

 crests strongly dentate ; the terminal joint is elongate ; its superior surface is com- 

 planate and triangular; its inferior convex, and marked with a dark median stripe. 

 The sternal plate is pentangular. It affords me great pleasure to dedicate this species 

 to my friend and co-laborer, Dr. H. Allen, IT. S. A. 



Length of body, cT G lines, 9 9 lines : of tail, cJ 1 8 lines. ? 8 lines. 



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



Gen. II. BUTHUS, Leach. 



Oeuli 8. Oeuli laterales utrinque 3 in serie recta vel curvata dispositi. 



Scorpio, Linn. Syst. Nat. Ed. 12, p. 1037, (Haud. Scorpius, Ehrenberg. 



Buthus, Leach, Linn. Trans, xi., p. 391. 



Gen. " Buthus, Leach." Sub-gen. Heterometrus, hometrus, Hemprich et Erhenberg. Symbols Phy- 

 sica;, Animal, Evertebrat. Scorpiones. 



Faru. Bulhides. Gen. " Buthus, Leach.," Opisthopthalnvus, Brotheus, Telegonus, Isehnurus, Koch Ueber- 

 sicht des Arachniden System, p. 36, 37. 



Gen. Scorpius, (partim.) Sub. gen. Atrms, Buthus, Telegonus, Gervais, Apteres iii. p. 52, 57, 59. ■ 



The study of the species of the United States, might lead one to consider this group 

 as consisting of two distinct genera. These would correspond in a great degree with 

 the Buthus and Telegonus of some authors. But S. squama, Gervais, a native of Van 

 Dieman's Land, and B. lesiieurii seem to unite them together. 



S. btaculeatus. — B. saturate cinnamomeus, pedibus dilute cinnamomeis : oculis lateralibus in serie 

 recta dispositis ; cephalothorace antico late sed haud profunde emarginato, abdomineque tuberculatis, 

 valde asperatis ; illo medio valde carinato ; palpis rnodice gracilibus, leviter pilosis, marginibus 

 valde crenulatis, superficie antica tuberculata ; manibus brevibus, nonnihil tumidis ; digitis valde 

 • elongatis, robustis ; pedibus compressis, granulatis, marginibus crenulatis ; eauda elongata, modice 

 gracile, marginibus valde crenulatis, iutcrdum dcnticulatis ; spiculo spinulo basali armato ; pectiuis 

 dentibus 20-32. 



Scorpio biacvleatus Latreille Coll. de Museum fsine description.) 



92 



