328 



Abdomen: tergites and sternites minutely sliagreened and some- 

 what glossy, with hairs like those of céphalothorax. 



Palps glossy, minutely shagreened, with fine, pointed hairs, some- 

 what longer on the inner side than on the outer side. — Trochanter 

 with no distinct stalk , calyciformed , the inner side strongly convex, the 

 outer side concave. Femur much longer than céphalothorax, with a very 

 short stalk, the inner side forming an irregularly undulating line , in all 

 nearly straight, the outer side, too, nearly straight, a little rounded next 

 to the extremity. Tibia much shorter than femur, calyciformed. Hand 

 with no stalk, somewhat longer and broader than tibia, on both sides 

 slightly convex, only slightly narrowing towards the extremity. Fingers 

 twice as long as hand, seen from above quite straight, laterally viewed 

 nearly straight, too, only somewhat curved towards each other in the 

 distal one fourth and the extremity, on the inner margins with few, 

 large, slender, straight and pointed teeth, with very broad interstices, 

 several times as broad as the teeth's width; on the fixed finger the teeth 

 are higher than on the moveable one. 



Mandibles minutely shagreened, the moveable finger about as long 

 as the trunk, strongly curved and only slightly thickened at the round- 

 ing; the fixed finger slightly curved and somewhat protracted (more than 

 general in the genus Chthonius)^ thus considerably projecting in the front 

 of the moveable finger, when the fingers are closed. 



Legs with pointed hairs; the femora of the two posterior pairs of 

 legs somewhat broad. Claws simple. 



Length 1,5 mm, width 0,6 mm. 



Measurements: céphalothorax: long. 0,45; lat. 0,45 in front; 

 0,40 behind. Mandibles: long. 0,34. Femur: long. 0,62; lat. 0,13. 

 Tibia: long. 0,24; lat. 0,13. Hand: long. 0,29; lat. 0,19. Fingers: 

 long. 0,59 mm. 



Chile: Santiago 1 specimen (Dr. Silvestri). 



The nearest relative among the South American Chthonius is Chth. 

 hirsutus Balzan, but the new species is distinguished from this, parti- 

 cularly by the far projecting finger of the mandibles, further by the 

 femur and tibia of the palps being proportionally longer, the fingers being 

 twice as long as the hand, these being in hirsutus only 1^2 times as long 

 as the hand; the teeth of the inner margins of the fingers are to be in 

 hirsutus, according to Balzan's figure, very broad, in the new species 

 they are much more slender. 



Druck von Breitkopf & Härtel in Leipzig. 



