TULLGREN, ARANE.E FR. THE GRAN CHACO. 31 



middle of the back there is four brown spöts t ha t form a 

 square broader behind than in front. The two posterior spöts 

 are situated in deep depressions. Behind these two latter 

 spöts there are about 8 transverse rows of four small spöts, 

 of which the hindmos.t rows form confluent stripes. On the 

 sides of abdomen numerous oblique stripes of spöts. The 

 venter dark brown with small lighter spöts. At the sides 

 behind three broader oblique dark brown stripes. 



Vulva with an extraordinary long clavus (conf. the fig. 

 9 b) that reaches more than half-way to the mamillae. 



Measurements. 



Total length 23,5 mm. 



Length of cephalothorax 10 » 



Breadth » » 8,5 >> 



Length » abdomen 17 » 



Breadth » » 15,5 » 



Length » 1st leg 31 » 



» » 2d » 28,5 » 



» » 3d » 20,5 » 



» >> 4th » 26,5 » 



Male. — Cephalothorax much narrower in front with the 

 lateral projections or corners much longer than by the fe- 

 male. The central ocular tumulus much larger. The colour 

 is dark redbrown with a dense grayish pubescence. The 

 central fovea more longitudinal. 



Eyes. Diagram of eyes as by the female, but narrower. 



Cheliceres much smaller and very inclined on account of 

 the , extraordinary large bulbi. They are very tapering to- 

 wards the apex with the inner contour straight and the outer 

 one strongly concave. The outer side is blackish, the inner 

 side more or less testaceous. The fang-groove at the inner 

 margin with a single stout tooth, the outer one with 2. The 

 exteriör corner at the base of the chelicer with a large roun- 

 ded tubercle. 



Mouth-parts and sternum as by the female. 



Legs 1. 2. 4. 3., dark blackish brown with a thick gray- 

 ish white pubescence. On some species the colour is di- 

 stinctly paler at the base of tibia and metatarsus. They are 

 all furnished with numerous yellowish red spines, which on 



