ON THE PEDIPALPI OF NORTH AMERICA. 363 



ters. They are perfectly distinct from " Buthm vitatus, Say," of Girard. The foregoing 

 description is taken from Florida specimens. Those from more southern climes have 

 the tads shorter and more massive. Their crests are more strongly pronounced and 

 denticulate, and even serrate, and the penultimate joint shorter and less cylindrical in 

 the male. Even in that sex it is indeed often irregularly parallelopipedal, with well- 

 marked crenulate or denticulate ridges. The last joint and sting are longer in the 

 tropical specimens. The palpi are somewhat more hairy and more denticulate. But 

 we have traced the gradations through all shades, from one extreme to the other. Mr. 

 Gervais, in separating his species, seems to have relied to some extent on the number 

 of teeth to the comb. But an extended examination has convinced us that, here, at 

 least, this character is entirely unreliable. The geographical range is very extensive. 

 We have seen numerous specimens from Florida, Cuba and Panama. Gervais de- 

 scribes it as coming from Guiana. His S. De Geerii, he states to be an inhabitant of 

 Club, Carthagena and Santa Fe de Bogota. S. Edwardsii of the two latter places 

 S. obscurus, of Columbia and Guiana. So it is likely that the species is common to most 

 of the countries of tropical America. If it is identical with Androctomts hiacv, 

 hatus of Lucas, as seems plausible, it is also an inhabitant of the Canary Islands. 

 The facility of its carriage from one port to another, in cargoes of lumber, &c, may, 

 in part, account for its wide distribution. 



Length of body, c? unc. H ? If of tail d' unc. 2\ 9 2. 



B. carolinianus.-B. fulvus, vitfo duabus, dorsalibus, fuseis, latis, interrupt antice coalescentibus • ce- 

 phalothorace late sed baud profunde emarginato, medio canaliculate j oculis lateralibus in serie recta 

 positis; palpis gracilibus, superficic antiea spinalis paucibus asperata, cristis leviter crenulatis • 

 mambusvixtumidis, brevibus j digitis valde elongatis, gracilibus, curvatis ; abdomine medio carinato' 

 cauda gracile, infra vitata, minute crenulata j spicule spiuulo parvissimo instructo; pectinis dentibus 

 21-25; lateribus nigro-fusco. 



^^locaroZman^PalisotdeBeauvois, Insect Recu. cnAfriqueet enAmeriq. p. 190, pi. v. fi- 3 1805 

 Buthus vitatus, Say, Jouru. Acad. Nat. Sci. I. series, vol. ii. p. 61, baud B. vitatus, Gnenn, Voy. du 

 Coquille, vol. ii. part. ii. p. 50. 



■ '.' Scorpio Americanm, De Gerr, Mem. vol. vii. p. 135, pi. 41, figs. 9-10. 



Scorpio (Atreus) vitatus. « Buthus vitatus, Say," Girard, Marcy's Report, p. 269, partim. 



The cephalothorax is slightly emarginate in front. The anterior angles are rounded. 

 The two dark stripes are so dilated and coalesced before the median eyes, as to form 

 a well-marked triangle, with its apex directed posteriorly. The surface is 'very rough, 

 uneven, and marked with lateral, oblique furrows. The lateral ocelli are of equal 

 size, and arranged upon two converging straight lines. The median are placed a 

 little in fron t of the middle of the cephalothorax. The mandibles, being light-yellow', 

 are quite prominent. The maxillary palpi in the females scarcely equal, but in the' 

 males a little exceed the body in length. Their crests are very feebly crenulate. 



