360 ON THE PEDIPALPI OF NORTH AMERICA. 



* * * * Lateral eyes arranged in a curved series. Sting without the basal sjmic:. 



B. hirsutus. — Body and tail very hairy. Cephalothorax with the anterior margin 

 convex and not emarginate. Length 41 inches. 



B. emarginaticeps. — Body and tail very hairy. Cephalothorax with the anterior 

 margin broadly and very deeply emarginate. Length 4| inches. 



B. eusthenura. — Body and tail moderately hairy. Hands very small and slender. 

 Last caudal segment rather large and robust. Sting very short and robust, strongly 

 curved. 



B. boreus. — Body and tail scarcely at all pilose. Hand tumid. Superior crests of 

 anterior caudal segments not terminating in a spine. Last article quite large and 

 robust. Sting rather short and robust, but very slightly curved. Length 3 inches. 



B punctipalpi. — Hand tumid. Superior crests of anterior caudal segments termi- 

 nating in a spine. Last article small and slender. Sting very long and slender, 

 strongly curved. 



B. spin igerus.— Hand small, scarcely at all tumid. Superior crest of anterior caudal 

 segments terminating in a spine. Last article large and robust. Sting short, robust, 

 and rather strongly curved. Length 2| inches. 



Gen. III. CENTRURUS, Oculi 10. 



C. phaiodactylus. Hand very much swollen. 



Species unknown to us. 

 S. punctatus, De Geer. 

 S. maculatus, De Geer. 

 S. testaceus, De Geer. 

 S. australis, De Geer. 



V^EJOVIS CAROLINUS, Koch. 



Gen. I. SCORPIO. 



Oculi 6. Oculi laterales utrinque 2. 



Scorpio, De Geer, Mem. des Insect., vol. vii. p. 337- Haud Scorpio, Linnseus. 



Sco7pms, Ehrenberg, Symbolse Pliysicse. 



" Fain. I. Scorpion ides." Koch Aracbniden, Syst., p. 36. 



S. allenii. — S. saturate brunneo-castaneus, loevis, venuste politus ; cepbalotborace antieo distincte emar- 



ginato; palpis modicis; manibus magnis, subquadrangulatis, latis, vix crenatis, sparse punctatis; digjtis 



robustis, niodice brevibus, fere rude punctatis, curvatis; oculis lateralibus fere asqualibus; cauda breve, 



valde crenulata; spiculo brevissimo, subuncinato, sine spinulo basali; peetinis dentibus fere 7. 



S. Allenii, Wood, Proc. Acad. Nat. Sci. April, 1863. 



The dorsum is beautifully polished, and not at all tuberculate. The palpi are of 



