14 Arachn. 
XI. ARACHNIDA. 
5. Neotropical Region. 
Central America : Guerrero, Guatemala, &c. : Aranece ; 0. P. Cam- 
bridge (1). — Costa Rica : Epeiridce ; Getaz. 
West Indies : Scorpiones and Pedipalpi ; POCOCK (2). — Jamaica : 
Aranece; Cockerell (1, 2). — St. Vincent : Attidce ; Peckiiam. — Trini- 
dad : Pseudidiops , &c. ; Pocock (4). 
South America : Venezuela : Aranece ; Simon (2). — Various localities: 
Scorpiones ; Pocock (3). — Epeiridce ; Keyserling. 
IV.— SYSTEMATIC. 
(a) scorpiones. 
Pocock, Ann. Nat. Hist. (6) xii, pp. 305-313, classifies the group as 
follows : — Fam. 1. Scoipionidce ) with subfamilies Scorpionini, Ischnu- 
rini, Diplocentriniy Hemiscorpiiniy Uradacini . Fam. n. Iuridce, 
with subfamilies luvini , Chcerilini , Chactini. Fam. in. Bothriuridce. 
Fam. iv. Buthidce . 
Buthid^i. 
Centrums : descriptions, with synonymy, of the known West Indian species; 
the following described and figured : — insulanus , Thor., Jamaica, 
p. 388, pi. xxx, 'fig. 12, testaceus , He Geer, Montserrat, p. 389, pi. xxx, 
fig. 11 t nitidu8 t Thor., Hayti, p. 390, pi. xxix,fig. 5, Pocock, J. Linn. 
Soc. xxiv. 
* Heteroctenus, n. g., p. 391, for junceus , Herbst., syn. hemprickii , Gerv., 
Hayti, p. 392 ; agamemnon t C. Koch, Brazil, p. 393 ; Pocock, J. Linn. 
Soc. xix. 
Isometrus mucronatus (Fabr.), discussed, p. 85, figured, pi. vi, fig. 1, 
Jtavimanus , Thor., Sumatra, p. 87, pi. vi, fig. 2 ; Pocock, in Max 
Weber’s Zool. Ergebnisse, &c., ii. 
I.formosus, Buitenzorg, p. 88, pi. vi, fig. 3, Pocock, in Max Weber’s Zool. 
‘ Ergebnisse, &c., ii, n. sp. 
* P&eudobuthus, n. n. for Bhoptrurus, Karsch, preoccupied, p. 312 \ Pocock, 
Ann. Nat. Hist. (6) xii. 
* Tityobuthus , n. g., for Rhoptrurus baroni , Poc., p. 312 ; Pocock, Ann. 
Nat. Hist. (6) xii. 
Tityus , C. Koch, restored for the American species referred by Thorell 
and others to Isometrus , with Phassus and Androcottus as synonyms, 
p. 376 ; androcottoides , Karsch, Trinidad, p. 377, pi. xxix, fig. 3, 
americanusy Linn., Hayti, Porto Rico, p. 378, pi. xxix, fig. 2, insignis, 
St. Lucia, p. 379, pi. xxix, fig. 10 ; Pocock, J. Linn. Soc. xxiv. 
