24 



ARKIV FÖR ZOOLOGI. BAND 2. N:0 19. 



This species is nearest allied to A. plagiatus Sim. ^ from 

 Venezuela. A comparison with the description published by 

 Mr. Simon shows the following differences. 



A. plagiatus Sim. 



Cephalothorax. The thoracic 

 part on each side with a 

 broad darker margin and 

 with radiating blackish stri- 

 pes. 



Eyes. The intervals between 

 the posterior eyes nearly 

 equal in length. Lateral 

 eyes equal in size. 



Cheliceres. Tnner margin of 

 fang-groove with five teetb, 

 outer with two contigous 

 ones. 



Legs with broad and distinct 

 blackish rings. 



Vulva »plus duplo latior quam 

 longior, in medio leviter 

 convexa, minute granosa et 

 olivacea, utrinque attenuata, 

 testacea, depressa et tenui- 

 ter rufulo-marginata, ad 

 marginen! posticum, in me- 

 dio, excisa et plagulam par- 

 vam nigram transversim 

 triquetram et minute bifo- 

 veolatam includens». 



A. biseriatus n. sp. 



Ce;p/^aZo^Äoraa; one-colouredy el - 

 low-brown. 



Eyes. The interva] between 

 the posterior centrals di- 

 stinctly shorter than the 

 distance from posterior la- 

 terals. Posterior laterals 

 smaller than anterior ones. 



Cheliceres. Outer margin of 

 fang-groove with 6 teeth, of 

 which the two most remo- 

 ved ones are largest, the 

 others are ver}^ minute. 



Legs one-coloured yellow- 

 brown. 



Vulva conf. the description 

 above and the fig. 5. 



In the structure of the vulva, these two species seem to 

 be very near related to each other, but in the coloration 

 and especially in the armature of the cheliceres they are very 

 different species. 



^ Conf. Aracbnides du Venezuela, Ann, soc. ent. Fr, Vol, Gl, 1892. 

 Pag, 430. Pl. 9, fig, 5. 



