386 ME. E. I. POCOCK ON THE 



b^. Tail stouter ; the trunk more finely gra- 

 nular, fuscous above, the tergites adorned 

 with three yellow spots insulanus, Thor. 



10. Centetjefs oeacilis (Latr.). 



Scorpio australis, De Geer, Mem. etc. vii. p. 348, teste Thorell ; not aus- 

 t rails of Linn. 



Scorpio gracilis, Latr. Hist. Nat. Gen. Crust, et Ins. vii. p. 127 

 (1804). 



Androctonus biaculeatus, Lucas in Webb 8r BertJielot's Hist. Nat. 

 Canaries, ii. pt. 3, p. 45 ; Gervais, Ins. Apt. iii. p. 54, pi. 23. fig. 3 ; id. in 

 Castelnau, Exped. dans VAmer. Sud, Scorpiones, pi. ii. fig. 4. 



Centrurus heterurus, Karsch, Mitth. Milnch. ent. Ver. 18/9, p. 122 

 (at least in part). 



This species is one of the commonest North Neotropical forms, 

 being widely distributed in Central America and at least the 

 northern parts of South America. It does not, however, appear 

 to be common in the West Indies, since the British Museum has 

 only one specimen from this region, and that is merely ticketed 

 vaguely "Antilles." 



The colour is usually a deep blackish green tinged with ferru- 

 ginous, the legs and hands beiog especially liable to take on a 

 clearer reddish colour. 



The trunk is coarsely granular above. The tail is slender, 

 posteriorly slenderer, about six times the length of the carapace 

 in the female, and more than nine times in the male, there is a 

 long spine close to the base of the aculeus. The palpi are slender, 

 the manus being only a little wider than the brachium ; the 

 superior keel of the manus is strong, as a rule, and there are 9 

 rows of denticles on the digit. The pectines are furnished with 

 an average of about 30 teeth (25-35). 



11. Cekteueus MAE6AETTATUS {Gervais). 



Scorpio margaritatus, Gervais, Voyage de la Bonite, i. p. 281, Atlas, Apt. 

 pi, i.figs. 13-17 (Paris, 1841) ; id. Ins. Apt.^ui. p. 55 (1844). 



Atrseus Edwardsii, Gervais, Arch. Mus. iv. p. 216, pi. xi. figs. 13, 14 

 (1844) ; id. Ins. Apt. iii. p. 53; id. in Castelnau, Exped. dans VAmer. Sud, 

 Scorpiones, pi. i. fig. 1. 



Atraeus De Geerii, Gervais, Arch. Mus. iv. p. 217, pi- xi. figs. 16, 17 ; 

 Ins. Apt. iv. p. 54. 



This species is common in Central America, Colombia, &c. 

 It is evidently abundant in some parts of Jamaica, whence the 

 British Museum has received many examples from Mr. Cockerell 



