chamberlin: new spiders of the family aviculariidae. 31 



proportionately larger and less than their diameter from the laterals; 

 and in having the claws of all the legs armed with a subhasal tooth. 

 From A. scalops Simon, with which it has points of similarity, it differs 

 in the inequality of the eye-rows above mentioned. 



AcTiNOPUS PRiNCEPS,^ sp. nov. 



Type. — M. C. Z. 5. 9- Brazil: Rio de Janeiro; Rio de Janeiro. 

 Nathaniel Thayer Exped. 



Carapace dark chestnut or somewhat reddish chocolate-color. 

 Chelicerae nearly black, with fringe of bristles red as usual. Legs 

 dark chestnut. Sternum and coxae of legs beneath a lighter chestnut. 

 Labium and coxae of palps darker than the sternum. Abdomen 

 brown, somewhat paler beneath. 



Fovea thoracica deep, lunate, clearly more than one third the width 

 of the carapace. A pit-like impression on each side just in front of 

 the caudal margin. 



Anterior median eyes less than their diameter apart (about five 

 sixths), and near two and one fourth times their diameter from the 

 laterals and about one and two thirds their diameter from the posterior 

 medians. Anterior lateral eyes with long diameter twice that of the 

 medians, and one and a half times that of the posterior laterals. 

 Posterior median eyes with longitudinal diameter two thirds as large 

 as that of the laterals from which they are separated by a little more 

 than their radius. Anterior row of eyes a little longer than the pos- 

 terior (38:35). 



Sternum widest behind and narrowed cephalad as usual; equal in 

 length and breadth. Anterior median fovea very deep and sharply 

 depressed, widening cephalad. Paired foveae all elongate, their 

 mesal ends narrowing and converging to the caudal end of median 

 fovea where they meet; first pair on level with caudal end of median 

 fovea. 



Labium long, with the sides converging distad; anterior margin 

 convex, semicircular. Distal end bearing numerous stout spinules 

 or cusps in transverse rows. 



Coxae of palps bearing numerous cuspules similar to those of labium 

 in a broad band across the distal end, none present proximally. Palpi 

 with many stout, curving spines arranged on sides toward ventral 



^ princeps, first in rank, prince. 



