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SCOKPIOKES. 



























inferior and constitutes the external area of the lower surface of the hand ; movable finger furnished with 













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two rows of fine teeth extending from the base to the apex. Tarsi furnished beneath with two rows of 

 spines. Pectines short, the shaft broad at the base owing to the width of the intermediate lamella. 







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Type 0. Upturns, Pal. de Beau v. (Scorpio). 



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Distribution. Northern parts of the Neotropical Region. 



Tropical Africa. Mada- 





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gascar. 











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The African and Madagascar species referred to this genus differ in certain structural 

 points from the one known Neotropical form, and have been separated as a distinct 

 genus named Opisthocentrus, which will probably have to be maintained. 



















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1. Opisthacanthus lepturus, (Tab. I. figg. 1, l a-g 9 6 ? .) 



Scorpio Upturns, Pal. de Beauv. Ins. Afr. et Amer. p. 191, Apt. t. 5. fig. 4 (1805) \ 











Scorpio elatus, Gervais. Arch. Mus. iv. p. 235, 1. 12. figs. 46-1-9 (1844) 2 ; Ins. Apt. iii. p. 69 (1844) 3 . 



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Opisthacanthus elatus, Peters, MB. Ak. Wiss. Berlin, 1861, p. 511 4 ; Pocock, Journ. Linn. Soc., 



Zool. xxiv. p. 398 (1893) 5 ; Ann. & Mag. Nat. Hist. (6) xii. p. 330, t. 14. figg. 2, 2 a (1893) 



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Kraepelin, Jahrb. Hamb. Wiss. Anst. xi. p. 120 (1894) 7 ; Das Tierr., Scorpiones et Pedipalpi, 









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p. 148 (1899) 8 ; Borelli, Boll. Mus. Torino, xiv. no. 338, p. 3 (1899) 9 . 

 Dacurus galbineuSy Peters, MB. Ak. Wiss. Berl. 1861, p. 511 10 . 



Opisthacanthus kinbergi, Thorell, Atti Soc. Ital. Sci. Nat. xix. p. 246 (1877). ll .. ^ 



2 • Colour a tolerably uniform deep brown, the abdomen often pale brown ; legs deep brown, with yellow tarsi, 

 ventral surface yellowish-brown. Carapace granular, a little longer than caudal segments 1 + 2 + \ of 3. 

 Terga also granular and rugose, the last not carinate, but furnished posteriorly with two small 

 tubercles. Sterna smooth, the last subsulcate. Tail about two and a half times as long as the carapace ; 

 the segments mesially excavated above, with rounded smooth edges, subcarinate beneath, but granular 

 only posteriorly, fifth segment denticulate beneath, vesicle smooth, with long hairs beneath the aculeus. 

 Chela? : humerus finely granular above, with tubercular keels ; brachium with strong denticulated crest 

 at the proximal end of its anterior surface; hand coarsely granular above, rugose beneath, denticulated 

 in front ; the underhand about as long as the movable finger and as the carapace, width of hand about 

 two-thirds the length of the underhand, fingers in contact throughout, not lobate. Legs finely granular, 

 the femora coarsely granular below ; tarsi armed below with 2 anterior and 4-5 posterior spines. Pectines 

 small, furnished with 4-7 teeth. ' - 



3 . Tail a little more than three times the length of the carapace. Base of the fingers lobate and sinuate. 



Pectines large and furnished with 9-14 teeth. 

 Measurements in mm. — $ . Total length 78, carapace 12, tail 33. " tf . Total length 69, carapace 10, tail 31. 



Hab. Panama, Rio Cianate, Punta de Sabana, Rio Lara, Laguna de Pita and Tintin 

 in Darien (Festa 9 ), San Jose in the Pearl Is. n . — Colombia. 



Recorded from the Isthmus of Panama by Dr. Borelli, who has kindly submitted 

 specimens to me for examination. The species possibly occurs in Haiti. 



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• Subfam. DIPLOCENTRIN^E. 



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DIPLOCENTRUS. 



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icenirus, Peters, MB. Ak. Wiss. Berlin, 1861, p. 512 l ; Thorell, Ann. & Mag. Nat. Hist. (4) 

 xvii. p. 12 (1876) 2 ; Pocoek, Journ. Linn. Soc., Zool. xxiv. p. 393 (1893) 3 ; Kraepelin, Jahrb. 



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; Das Tierr., Scorpiones et Pedipalpi, p. 99 (1899) 



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