chamberlin: new spiders of the family aviculariidae. 27 



Pycnothele perditus,^ sp. nov. 

 Plate 1, fig. 1-4. 



Tijpe. — M. C. Z. 1. cT. Brazil: Mendez, Rio Parahyba. Na- 

 thaniel Thayer Exped. 



Parah/pc.— M. C. Z. 2. 9. Brazil: Mendez, Rio Parahyba. 

 Nathaniel Thayer Exped. 



Integument of carapace, tliorax, legs, palpi, and chelicerae chestnut, 

 sometimes in part dusky. Pubescence of these parts brown of a 

 bronze or copper lustre. Bristles of the legs short, obliquely inserted, 

 dark brown in color. Abdomen with a thick velvety coat of brown 

 pubescence; the bristles moderate or short in length, numerous, 

 reddish brown of a somewhat copper cast. 



Eye-tubercle broad; rather abruptly and considerably elevated. 

 Eye-area nearly twice as wide as long (40:21). In the male the an- 

 terior row of eyes in dorsal view strongly procurved, a line passing 

 through middles of median eyes running caudad of posterior edges of 

 the lateral ones. Anterior median eyes very laige, their diameter 

 exceeding the long diameter of the lateral eyes in about the ratio 8:5; 

 near one fourth their diameter apart and even closer to the lateral eyes. 

 Posterior lateral eyes equal in size to the anterior laterals from which 

 they are separated by about their radius. Posterior median eyes 

 much smaller than the laterals, their long diameter being about three 

 fifths that of the latter; about equidistant from the lateral and the 

 anterior median eyes. A line tangent to the caudal margins of the 

 two posterior eyes on each side runs almost directly transverse. 



In what is identified as the female of this species the eyes are less 

 close together and the anterior median eyes are relatively somewhat 

 smaller. Anterior row with procurvature from above as in the male. 

 Anterior median eyes with diameter exceeding that of laterals in only 

 ratio 9:7; one third their diameter or slightly more apart, and one 

 fourth their diameter from the laterals. Relations of eyes otherwise 

 as in the male. 



Labium broad; cuspules in a line across anterior end, few. 



(.'uspules or spinules on proximal end of coxae of pedipalps not 

 numerous and the area covered by them small. 



^ perdiius, lost. 



