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ISOMETRUS.— TITTUS. 



39 





Scorpio maculatus, De Geer, Mem. Hist. Ins. vii. p. 346, t. 41. figg. 9, 10 (1778) 4 . 



Lychas maculatus, C. L. Koch, Die Arachn. xii. p. 1, fig. 960 (1845) \ 



Isometrus maculatus, Thorell, Ann. & Mag. Nat. Hist. (4) xvii. (1876) 6 ; Simon, Ann. Mus. 



Genova, xx. p. 370 (1884) 7 ; Oates, Journ. Bomb. Nat. Hist. Soc. iii. p. 250, figg. 3, 4 



(1888) 8 ; Kraepelin, Jahrb. Hamb. Wiss. Anst. viii. p. 245 (1891) 9 ; Das Tierr., Scorpiones 

 et Pedipalpi, p. 66 (1899) 10 . 

 Scorpio dentatus et americanus, Herbst, Nat. ungefliigelt. Ins. iv. pp. 55, 60, t. 6. figg. 2, 3 (1800) n . 



Lychas americanus, C. L. Koch, Die Arachn. xii. p. 1, fig. 961 (1845) 12 . 



13 



Buthus {Isometrus) filum, Hempr. & Ehrenb. Syrnb. Phys., Scorp. p. 3, t. 1. fig. 3 (1828) 



Scorpio (Atreus) filum, Gervais, Ins. Apt. iii. p. 52 (1844) u . 



Lychas par aensis, C. L. Koch, Die Arachn. xii. p. 6, fig. 963 (1845) 15 . 



Scorpio (Lychas) gabonensis, Lucas, in Thomson's Arch. Ent. ii. p. 430, t. 12. fig. 8 (1858) . 



Scorpio (Lychas) guineensis, Lucas, op. cit. p. 432, t. 12. fig. 9 (1858) 17 . 



Colour yellow varied with black, frontal area of carapace with a triangular yellow patch ; terga marked 

 posteriorly with five black spots separated by six clear yellow spots ; tail, legs, and chelae spotted «or lined 

 with black. Carapace about as long as the first and half the second caudal segments, or as long as the 

 fourth. Upperside of trunk evenly granular ; sterna smooth, the last finely granular, with four granular 

 crests. Tail slender, about five and a half times as long as carapace, evenly granular. Chelw granular ; 

 hand keelless, scarcely as wide as brachium ; underhand less than half the length of the movable finger, 





which is longer than the carapace. 



<$ . Tail very long, about eight times as long as carapace ; fourth segment about one and a half times as long as 

 carapace. Chelce long and slender ; hand slender, parallel-sided, its width about one-third the length of the 

 underhand, which is at least two-thirds the length of the movable finger. Pectinal teeth 17-19 ( <$ $ ). 



Measurements in mm. — $ . Total length 49, carapace 5, tail 28, underhand 2*5, movable finger 6. <S . Total 

 length 62, carapace 5, tail 42, underhand 4-5, movable finger 7. 



Hab. \ Central America. — Tropical South America ; Antilles, &c. 



Although this species has not been actually recorded from Central America, there 



can be little doubt as to its occurrence in or near the seaport towns of that country, 

 since it has been noticed in most of the West-Indian Islands, and in various parts of 

 South America, as well as in Africa, India, Spain, &c. 



TITYUS. 



Tityus, C. L. Koch, Die Arachn. iii. p. 33 (1836) (part.) ; Pocock, Journ. Linn. Soc, Zool. xxiv 



p. 376 (1893) ; Kraepelin, Das Tierr., Scorpiones et Pedipalpi, p. 69 (1899). 



Maff. Nat. Hist. (4) xvii. p. 8 (1876) ; Karsch, Mittheil 



ent. Ver. iii. p. 18 (1879) ; Pocock, P. Z. S. 1890, p. 119. 

 ms, Thorell, Ann. & Mag. Nat. Hist. (4) xxii. p. 8 (1876 

 Anst. viii. p. 107 (1891). 



W 



Androcottus, Karsch, Mittheil. Munch, ent. Ver. iii. p. 11 (1879). 



Fingers of the chelse furnished with many rows of teeth largely overlapping each other, so that the distal 

 extremity of each row, which has an enlarged terminal tooth, lies on a level with the middle of the 



series distal to it (Tab. IX. fig. 6 a). 

 In all the Central-American species the base of the pecten is furnished with a smooth and rounded lobe in 

 the female, and the males have the chelae either longer or stouter and the tail longer than in the female. 



Type T. bahiensis, Perty {Scorpio). 



