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22 



SCOEPIONES. 



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1. Centmroides thorelli. (Tab. V. figg. 2, 2 a-c, $ e .) 



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Centrums thorelli, Kraepelin, Jahrb. Hamb. Wiss. Anst. viii.p. 124(1891)'; DasTierr., Scorpiones 



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first and one-third of the second caudal segments, and about as long as the fourth. 



et Pedipalpi, p. 89 (1899) 2 . 



$ . Colour : upperside of trunk blackish, the carapace variegated with symmetrically arranged 



patches ; the terga with a narrow median and marginal yellow stripe and generally a pair of irregularly 

 defined >< -shaped marks; sterna yellow, variegated with black, the first almost uniformly yellow, 

 the fifth densely variegated ; tail marbled with black below and laterally, especially at its posterior 

 end ; legs, chelae, and chelicerse marbled black and yellow, the fingers uniformly yellow throughout. 

 Upperside of trunk closely and coarsely granular, no lateral keels on the terga ; carapace as long as the 



Sterna smooth ; the 



last finely granular, with four granular keels. Tail a little more than five times as long as the carapace, 

 slightly narrowed posteriorly, fourth segment about twice as long as wide ; the intercarinal spaces, even 

 on the upperside, finely granular, all the keels coarsely granular ; vesicle coarsely granular below, with a 

 large subaculear tooth remote from the base of the aculeus. Chelce finely granular ; the crests, including 

 those on the upperside of the hand, granular ; hand only slightly wider than the brachium, the width 

 about three-quarters the length of the underhand, which is more than half the length of the movable 

 finger, the latter very weakly lobate and furnished with eight rows of teeth (seven when the two proximal 

 rows are united). Pectinal teeth 13-16. 



S . Like the female in colour and most structural features, but the tail much longer, more than seven times 

 as long as the carapace, which is about equal to its first segment, its fourth segment nearly four times as 

 long as wide. Vesicle unique in shape, flat below, nearly parallel -sided, but widest distally on each side 

 of the base of the aculeus, where it rises into a pair of rounded shoulder-prominences. Chelce longer than 

 in female; the hand weakly crested ; fingers not lobate, movable one-third longer than underhand. 



Measurements in mm. — <j> . Total length 39, carapace 4, tail 22 ; width of hand 1*2 ; length of underhand 2*5, 



of movable finger 4*5. cS . Total length 42, carapace 3-2, tail 28 ; width of hand 1 ; length of under- 

 hand 2*5, of movable finger 4*2. 



Hab. Guatemala 1 (Mus. Brit.), Guatemala city and Volcan de Agua (0. Stoll). 



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2. Centmroides elegans. 





(Tab. V. figg. 





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C, $ 6 .) 



? Scorpio granosus, Gervais, in Castelnau's Exped. dans PAmer. du Sud, Myriap. et Scorp. p. 42, 



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t. 2. figg. 2, 2 a-c x (nee Scorpio granosus, Gervais, Arch. Mus. iv. p. 233, 1844). 

 Tityus infamatus, C. Koch, Die Arachn. xi. p. 46, fig. 873 (1845) a . 

 Centrums infamatus, Kraepelin, Jahrb. Hamb. Wiss. Anst. viii. p. 125 (1891) (part.) 3 ; Das Tierr., 



Scorpiones et Pedipalpi, p. 90 (1899) (part.) \ 

 Centrums elegans, Thorell, Atti Soc. Ital. Sci. Nat. xix. p. 145 (1877) 5 . 

 Centrums limpidus, Karsch, Mittheil. Munch, ent. Ver. iii. p. 120 (1879) 6 . 



$ . Colour : upperside of trunk yellow, banded with black ; carapace with black margin, black ocular tubercle, 

 and four black lines, one on each side passing backwards and slightly inwards from the lateral eyes to the 

 posterior border, and one on each side close to the middle line from the anterior border to the ocular 

 tubercle, thence backwards on each side of the median groove to the hinder border ; dorsal side of abdomen 

 with a pair of broad black bands separated by a broad median yellow band and from the lateral borders 



by another yellow band, the yellow and black bands approximately equal in width ; last tergite not 

 distinctly banded ; ventral surface pale ; tail, legs, and chelae quite pale or mottled with black ; lingers 

 same colour as hands. Upperside of trunk closely and thickly granular, the terga with scarcely a trace 

 of lateral keels even on the fifth and sixth. Carapace as long as the first + 1 of the second caudal segments 

 a little longer than the fourth, and shorter than the fifth. Sterna smooth and polished, the third mesially 

 pitted, fourth with a pair of abbreviated submedian keels, fifth closely granular, with four granular crests. 

 Tail a little more than five times as long as the carapace, finely granular throughout, with strong keels 



studded with pearly granulations ; vesicle nearly smooth, with a small tubercle beneath and remote fr 



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