ON THE PEDIPALPI OF NORTH AMERICA. 361 



medium size. The second joint, has nil of its borders, except the postero-inferior, 

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

 coraplanate ; 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 arc 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, U. S. A. 



Length of body, c? G lines, ? 9 lines : of tail, d^ 8 lines. ? 8 lines. 



H<d). — Lower California. Smithsonian Museum. J. Xantus de Vesey. 



Gen. II. BUTHUS, Leach. 



Oculi 8. Oculi laterales utrinque 3 iu serie recta vel eurvata dispositi. 



Scorj^io, Linn. Syst. Nat. Ed. 12, p. 1037, (Hand. Scorpiua. Ehrenberg.) 



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



Geu. " Buthns, Leacli." Sub-gen. Jli'f.ei-omrd-iii:. Isomctrua, Heraprieb et Erhonbcrg. Symbol.a; Pby- 

 siciw, Animal, Evertebrat. Scorpiones. 



Fam. Buthides. Gen. " ButJms, Leach.," Opiatliopthalmus, Brotheux, Tc7ci/onns, Jschnnriis, Koi:h Ueber- 

 sicht des Araohniden System, p. 36, 37. 



Gen. Srorpius, (partira.) Sub. gen. Atrcu^, Bnthus, TeJegonus, Grrvnis, 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 cori-espond 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. lesueurii seem to unite them together. 



S. BiACULEATUS. — B. saturate cinnamomeus, pcdibus dilute cinnamomeis : oculis lateralibus in serie 

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

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

 valde crenulatis, suporficie antica tuberculata ; manibus brevibus, nounibil tumidis; digitis valde 

 elongatis, robustis ; pedibus compressis, granulatis, marginibus orenuhitis ; eauda elongata, modice 

 gracile, marginibus valde crenulatis, intordum dcnticulatis ; spiculo spiuulo basali armato ; pectinis 

 deutibus 20-32. 

 Si-orpio hiacukadis Latreille Coll. do IMuseum (sine description.) 



92 



