litth-K-noicn Neotropical Scorpions. All 



strong- teeth in front and a row ot 12 setal pores below ; hand 

 a little v\ ider than brachium, its width about two thirds the 

 length of the underhand; hand with 7 granular crests; the 

 external finger-keel strong; fingers long, slender, in contact, 

 the movable quite as long as the carapace and considerably 

 longer than the underhand. 



Pectinal teeth 8-9. 



Measurements in millimetres. — Total length 44 ; length of 

 carapace 6 ; tail 14 ; underhand 4'0 ; movable finger 6'5 ; 

 width of hand 3. 



Loc. Atoyac in Vera Cruz, Mexico. 



One specimen of this interesting new species kindly. sent 

 to the British Museum by Dr. A. Dug5s. 



Genus Chactas, Gerv. 

 Chactas Sirnonsi, sp. n. 



Colour entirely black throughout, except for the tarsi, 

 vesicle, lower side of cephalothorax, and middle of first three 

 abdominal sterna, which arc brown. 



Carapace almost granular throughout, smooth and punc- 

 tured round the median eyes and on the summit of the tubercle ; 

 frontal lobes rounded ; lateral eyes but little prominent, median 

 eyes rather more than a diameter apart. 



Terga sparsely covered in their posterior half with coarse 

 scattered granules, more thickly granular at the sides. 



Sterna smooth, pitted with a i&\Y coarse punctures and 

 obsoletely punctulate. 



Tail tolerably thick; third segment as wide as long, fifth 

 only a little more than twice as long as wide ; first and second 

 segments quite smooth and polished below, third roughened 

 with weak granulation, fourth granular throughout but 

 without median keels, fifth also coarsely granular and 

 normally keeled below ; inferior and superior lateral keels 

 strong and subdentate, inferior lateral keel distinct on third 

 and fourth, just traceable on second segment ; lateral and 

 superior surface of tail with a few coarse granules, upperside 

 of fifth segment finely granular ; vesicle granular below, wider 

 than filth caudal segment and wider than high. 



Chelce: humerus granular above; brachium roughened above, 

 with low squamiform granules, coarsely granular posteriorly, 

 furnished below with a series of 5 setal pores ; hand as wide 

 as the length of the underhand, its width about four fifths the 

 length of the movable digit, smooth in the middle above, but 

 sculptured with a punctured network, becoming coarsely gran- 

 ular externally and internally, inner surface coarsely granular, 



