TULLGREN, ARANE.E FR. THE GRAN CHACO. 



19 



steriors equidistant from cen- 

 tral anteriors and posterior 

 laterals. 



Sternum testaceous brown. 



Leg.^ 4. 1. 2. 3. Tibia, 

 metatarsus and tarsus dull 

 orange-bro wn. Tarsal supe- 

 rior* claws with 10 — 11 den- 

 ticles, inferior with 4 or 5. 



Ahdomen black or deep brown 

 with a central dorsal longi- 

 tudinal rufous silver-white 

 band on the posterior three- 

 quarters; broad in front, 

 narrowed behind, with four 

 and often five short obh- 

 que branches. 

 Long. 18 mm. 



Posterior centrals a httle 

 longer removed from ante- 

 rior centrals than from 

 posterior laterals. 



Sternum dark brown to nearJy 

 black. 



Legs 4. 3. 2. 1. The same 

 joints w4th more or less 

 distinct darker tips. Tarsal 

 superiorclaW'S with 8 — 9den- 

 ticles, inferior w^th 3. 



Ahdomen deep brown wdth two 

 pairs of small transverse- 

 obliqae påle testaceous spöts 

 on the middle of the back 

 and behind these a longi- 

 tudinal stripe with four 

 short oblique branches on 

 each side. 



Long. 16 mm. 



Fam. Zoropsidae. 



Acanthoctenus Keys. 



A. liiieatus n. sp. (Pl. 2, fig. 4a -c.) 



Male. — Cephalotliorax broad oval, very narrow^ in front, 

 comparatively high, highest behind the cephalic part, w^hich 

 is very small, in length occupying about a third of the length of 

 cephalotliorax. The colour is yellow^-brow^n wdth a very nar- 

 row^ black margin and on each side a broad blackish lateral 

 band. Region ©f eyes and clypeus dark brown. Central 

 furrow^ very long; cephalic lateral strige very deep, thoracic 

 striae distinct. It is clothed with a short adpressed pubescence. 



Eijes. — Anterior row^ as recurved as anterior laterals 

 and posterior centrals form a nearly straight line. Anterior 

 centrals much smaller than posterior centrals but larger than 

 anterior laterals and about their diameter apart. Clypeus a 

 little higher than anterior centrals. The interval between 



