TULLGREK, ARANE.^ FR. THE GRAN CHACO. 51 



Fam. Pisauridae. 



Ancylometes Bert k. 



A. boliviaiius n. sp. (Pl. 7, fig. 24). 



Female. — Cephalothorax broad oval, comparatively low, 

 with profile straight. Central furrow very short, cephalic 

 and thoracic striae distinct but very shallow. The colour is 

 blackish brown, inside the margin a yellowish gray lateral 

 band and such radiating stripes. From the posterior row of 

 eyes two short and narrow, yellow stripes run divergent 

 backwards. The integument perfectly covered by a short 

 adpressed pubescence. 



Eyes, Anterior row strongly recurved with central eyes 

 largest. Anterior laterals and posterior centrals form a little 

 procurved line. Anterior centrals scarcely their diameter 

 apart; distance from anterior laterals nearly twice as long. 

 Area of central eyes very little narrower in front, as long as 

 broad, with anterior ones very little smaller. Posterior row 

 strongly recurved with central eyes much larger and scar- 

 cely their diameter apart. Lateral eyes situated on a low 

 tubercle about the diameter of the larger posterior one apart. 

 Clypeus not fully as high as the area of central eyes. 



Cheliceres blackish brown with a den se grayish brown 

 hair-dress. Inner margin of fang-groove with 4 equal teeth. 



Coxce of pedipalp and lahium dark rufous-brown. 



Sternum very little longer than broad, reddish brown, 

 clothed with brown and blackish hairs. 



Legs 4. 1. 2. 3, dark rufous brown, clothed with a 

 dense pubescence of grayish or blackish brown hairs. Fe- 

 mora nearly black on anterior side and above with three 

 transverse grayish yellow spöts. Femora I — IV spinose above. 

 Tibise I — II with four pairs, tibise III — IV with three pairs 

 of spines beneath.- Metatarsi I and II with 3 pairs of spines 

 beneath, and a single apical central spine beneath; III and 

 IV with two apical spines beneath. Tarsal claws 3, supe- 

 riors armed with 5 or 6 long broad denticles. Tarsi III 

 and IV with a double series of 6 small spines beneath on 

 either side of central longitudinal band of setae. A t hick 

 scopula beneath metatarsi I and II and beneath tarsi and 

 apical half of metatarsi III and IV. 



