TULLGREN, ARANE.E FR. THE GRAN CHACO. 27 



legs with longer and narrow claws Avith 4 small denticles 

 (conf. fig. 6 c). 



Ahdomen depressed, elongate-oval, a little tapering in 

 front. It is of grayish brown colour and clcthed with a very 

 thin pubescence. The venter with a large and härd epiga- 

 stric plate of yellow brown colour, behind with two trans- 

 verse impressions. 



Vulva consist of a narrow transverse apperture (Conf. 

 fig. 6 b). 



Mamillce 2 very small ones. 



Measurements. 



Total length 8,5 mm. 



Length of cephalothorax 2,9 » 



Breadth » » 2 » 



Length » abdomen 6 » 



Breadth » » 3,5 » 



Length » 1st leg 6,7 9 » 



» » 2d » 4,6 8 » 



» » 3d » 4,3 1 » 



» » 4th » 6,9 » 



Length of the joints of 1st leg.: 1,26 — 0,2 — 2,i5 — 1,73 — 1,6 — 



0,63-0,47 mm. 



» » » » » 4th » : 0,84—0,2-1,8 — 1 — 1,6 — 0,47 



-0,79. 



A single adult female from Salta, Argentine. 



Fam. Theridiidae. 



Latrodectus Wallk. 

 L. curacavieiisis Mlill. (Pl. 3, fig. 7 a, b). 



Cambridge. F. P.. On the spiders of the genus Latrodectus Walck. 

 in Proc. Zool. Soc. 1902, p. 254, Pl. xxvii, fig. 4. 



Of this difficult genus the collection contains three ad. 

 females, which I ref er to this species. They differ especially 

 in the colour, through which they remind of the figures of 

 L. formidabilis Walck. and variegatus Nic. published by Ni- 

 COLET in Hist. fis. y pol. de Chile, Araneideas Pl. N:o 4. fig. 



