SCOKPIONS OF THE GENUS ISOMETUUS. 439 



almost wholly smooth. Digits long, curved, in contact through- 

 out their extent. 



Legs with anterior surfaces granular, carinate ; tihice of two 

 posterior pairs spurred. 



Pectines very short and armed with ten teeth. 



Stigmata small and slit-like. 



Measurements in millimetres. — Total length 35, of tail 20"5 ; 

 1st segment, length 2-3, width 3 ; 2nd, length and width 2-5 ; 3rd, 

 length 2-7, width 2-5 ; 4th, length 3-2, width 2-2 ; 5th, length 4*7, 

 width 2"2 ; vesicle, length 2-5, width 1-5. Palp — humerus, 

 length 4 ; brachium, length 4*5, width 2 ; manus, width 1-7 ; 

 length of " hand-back " 2'3 ; movable digit, length 5. 



A single female specimen in the Museum collection ticketed 

 Philippine Islands, from the collection of Mr. Cuming. 



This species is very closely allied to I. armillatus (Gerv.), a 

 species only known to me from Grervais's figure and description of 

 it, and from the characters that Mons. Simon has mentioned in 

 his synoptical table of the Oriental species of the genus. On the 

 strength, however, of there being in this species of mine no trace 

 of the black " bracelet " of the brachium and only ten pectinal 

 teeth as opposed to eighteen in Gervais's type, I have ventured to 

 regard it as new. This form most nearly resembles I. armillatus 

 in having ten keels on the first two caudal segments, four keels 

 on the posterior abdominal sternite, and at least the last two ab- 

 dominal sternites covered with granules. In the number of its 

 pectinal teeth it comes nearest to Androctonus variegatiis, Gerv., 

 fi'om New Ireland. 



ISOMETRUS AEMATUS, Sp. n. (PI. XI. figs. 3-3 cl.) 



Colour (specimen dried and probably somewhat faded) almost 

 Avholly fulvous, with feeble indications of fuscous markings on 

 the upper surface of the trunk and limbs ; ocular tubercle black. 



Ceplialotliorax deeply emarginate in front, thickly covered with 

 larger and smaller granules ; the central depression smooth, deep 

 behind ; the area external to the tubercle also smooth, as also for 

 the most part is the tubercle, the granules at the^ summit of the 

 sides of the depression forming in the posterior third of the 

 cephalothorax an indistinct keel. 



Tergites thickly granular throughout, from the second to the 

 sixth with a conspicuous median keel, the seventh with an anterior 

 subgranular median keel and two strongly granular lateral keels. 



