CENTEUEOIDES. 



31 





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the lower side darker than the upper, and the keels darker than the intercarpal spaces ; chelicerse 

 yellowish-brown ; chelae with humerus and brachium yellow ; hand and fingers deep reddish-brown, much 

 darker than the brachium, base of fingers the same colour as the hand, their distal extremities generally 

 paler; legs yellowish. Carapace as long as the first + | of the second caudal segment, about as long as 

 the third ; beset with coarse subserially arranged granules. Terga also coarsely granular, the interstices 

 and anterior portion finely granular; lateral crests distinct and consisting of three or four granules. 

 Sterna 1-4 smooth, except the subpectinal area of the first, which is finely granular ; a pair of indistinct 

 crests on the fourth ; fifth sparsely granular, the keels strong, the laterals granular, the medians crenulate. 

 . [ Tail strong, about five and a half times as long as the carapace ; the first segment slightly wider than 

 the rest, about one-third or one-fourth longer than wide, fourth barely, fifth slightly more than, twice as 

 long as wide; the keels strong and coarsely granular, the interstices scarcely or weakly granular, 

 the fourth more so than the third, and the fifth much more so than the others ; vesicle weakly granular, 

 its width as great as that of the brachium, the subaculear tooth distinct in young specimens, but often quite 

 small and tubercular in adults. Chelce thickly studded with long hairs internally, with the intercarinal 

 spaces scarcely granular ; the keels of humerus and brachium coarsely granular ; hand large, its width 

 nearly equal to that of the underhand, equal to that of the third segment and half the length of the 

 movable finger, the upperside furnished with a pair of strong, nearly smooth crests, the external more 

 broken up into low tubercles than the internal; a few granules on the inner surface of the hand and a 



few on the outer side below the outer crest ; movable finger with a strong lobe, furnished with eight rows 

 of teeth (excluding the small apical row) and rather longer than the carapace. Pectinal teeth 25-30. 



c? • Like the female in colour and granulation. Tail very long, about seven and a half times as long as the 

 carapace, which above equals the first segment in length, and a little exceeds one-third of the length of 

 the fourth + the fifth ; the first segment a little more than twice as long as wide, the fourth three times as 

 long as wide, the fifth rather more than that ; the vesicle with subparallel sides, expanded or shouldered 

 at the base of the aculeus, a small subaculear tooth. Chelce a little longer than in the female ; the 

 hand narrower, its width about two-thirds the length of the underhand, less than half that of the movable 

 finger, and equal to or slightly exceeding that of the first caudal segment. Pectinal teeth 27 to over 30. 



Measurements in mm. — $. Total length 96; length of carapace 10, of tail 58; width of brachium 3*5, of 

 hand 5-5 ; length of underhand 6, of movable finger 10-5. c?. Total length 101, carapace 8-8, tail 69; 

 width of brachium 2'5, of hand 4*5 ; length of underhand 6-2, of movable finger 9*8. 



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Hal. North America, California. — Mexico, Presidio and Mazatlan (Forrer), Sierra 



Madre del Sur and Dos Arroyos in Guerrero (H. H. Smith), Cordova (Mus. Brit.), 



Yucatan (Cuming); Guatemala, near the city and Lanquin (Stoll); Costa Rica {Rogers), 

 Guadalupe and San Jose (Tristan and Biolley) ; Panama (Cuming), Punta de Sabana, 



Darien (Festa), San Jose in the Pearl Is. 18 . — South America to Peru, Brazil, and 



Chile ; Jamaica. — W. Africa, Gambia, Sierra Leone. 



This species has a wide range in Central and South America. In addition to 

 numerous examples ticketed merely Central America or Mexico, the British Museum 

 has others from the above-mentioned localities in that region, and also large numbers 

 as well from Jamaica (Elmsley, Peckham, and Cockerell), and some ticketed California 

 (J. H. Gurney). Southwards from Darien C. margaritatus runs into the mainland 

 of Colombia — Ib&que (Goudot, in Mus. Brit.), Cartagena and Bogota (type of Scorpio 

 edwardsii, teste Gervais 7 ); into Ecuador — Guayaquil (E. Whymper, in Mus. Brit.), 

 Chimborazo and Santa Bosa (Simons, in Mus. Brit.), and the island of Puna in the 

 Gulf of Guayaquil, where, according to Gervais l , the type of C. margaritatus was 

 procured ; thence southward into Peru (teste Gervais) and Chile, where, according 

 to Gervais 10 , the type of Scorpio de geerii was collected. Gervais also records 





