TULLGREN, ARANE.E IR. THE GRAN CHACO. 11 



Measurements. 



Total length 25,5 mm. 



Length of cephalothorax 11 » 



Breadth » » 8,5 » 



Length » sternum 5,5 » 



Breadth » » 4,: » 



Length » abdomen 11 » 



Breadth » » 7 » 



Length » 1st leg 28 » 



» » 2nd » 24,5 » 



» » 3rd » 21,5 » 



» » 4th » 29,4 >> 



Length of joints of 1st leg: 4—2—7,5-4,5—5,2 — 4,3 — 4 mm. 

 » » » ^> 4th » : 3,6 — 1,8 — 7,1—3,6—6 — 7-4 '> 

 One subadult and one young specmien from Tatarenda, 

 Bolivia and one young from Quinta in Prov. de Ju ju v, Ar- 

 gentine. 



Acanthoscurria Auss. 



Ausserer, Verh. zool.-bot. Ges. Wien, 1S71, p. 205 



Simon, Histoii-e nat. des Argignées. T. I, fasc. 1, p. 157, 1892; T. 

 IT, fasc. 4, pag. 943, 1903. 



A. gigaiitea n. sp. (Pl. 1, fig. 2 a c). 



Female. — Cephalothorax broad oval, very little longer 

 than broad. Cephalic area low and occupying about two- 

 thirds the length of cephalothorax. Cephalic and thoracic 

 striae very distinct. Central fovea very deep and a little 

 procurved. Colour dark brown with a short adpressed grayish 

 brown pubescen ce and with long rufous hairs at the sides. 



' Eyes. Ocular tumulus broad oval. Diagram of eyes 

 with the lateral eyes forwards convergent. Anterior row 

 shghtly procurved only as much as the front-edge of anterior 

 centrals reach a little way behind that of anterior laterals. 

 These eyes very 'little larger than the former, rounded ones. 

 The distance between the anterior centrals about as long 

 as their diameter and a little shorter than the distance from 

 the anterior laterals. Posterior centrals round and smallest 

 of all. The distance from the lateral ones much shorter than 

 their diameter, and the interval between the anterior and 

 posterior centrals a little longer than the diameter of the 

 latter ones. 



