chamberlin: the arachnida. 19^ 



free areas over which the lighter hairs unmixed with dark extends from 

 each side. Bristles of legs shorter proximad, becoming longer and 

 more numerous especially on tibiae ventrally and on metatarsus above 

 as well as laterally and ventrally; bristles dark proximally, becoming 

 light rufous distally, rather coarse. Integument of abdomen above 

 dark, somewhat dusky brown, ventrally lighter brown, with several 

 small obscure white spots on each side; bristles of dorsum subdense, 

 forming a light brick-red area. 



Eye-tubercle black, well defined, moderate in height, highest 

 between posterior median eyes, more strongly convex anteriorly than 

 posteriorly. Eye-area trapeziform, the posterior row being distinctly 

 longer than the anterior, the difference typically distinctly more 

 marked than in peruvianus (up to 85: 78); area from a little less than 

 half as long as greatest width to a little more thus also differing from 

 peruvianus. Anterior row of eyes from moderately procurved to 

 nearly straight, much more procurved in anterior view than in dorsal. 

 Anterior median eyes with diameter two thirds that of laterals ; about 

 two thirds their diameter apart, less than their radius from the laterals. 

 Posterior lateral eyes about three fourths the diameter of the anterior 

 laterals, less than their radius from the latter. Posterior medians 

 pyriform in outline, being narrowed to a point caudad and widely 

 rounded cephalad, (Plate 7, fig. 3). 



Head moderately elevated, in outline slightly convex, highest a 

 little caudad of eye-tubercle. Fovea straight or vaguely procurved, 

 short and deep. 



Sternum longer than wide. Posterior sigillae about their length 

 from margins. Median ones submarginal ; anterior marginal. 



Mesal margin of furrow or chelicera bearing a row of fourteen 

 teeth. 



Labium wider than long, truncate distad. Spinules in a narrow 

 band (about four rows deep) across distal end, the spinules not dense. 



Spinules on proximal end of endite rather numerous. 



Anterior surface of coxa I with longer in part semiprone hairs and 

 some of the short, slender, distally obtuse or clubbed hairs such as 

 are present in peruvianus but in addition below the suture with 

 numerous dark, strongly chitinized spiniform bristles, these more 

 numerous distally, some rather more slender ones also occurring 

 above suture. 



Tarsal claws four or five (anterior and posterior of leg I respectively) , 

 proportionately shorter, more slender and more uniform than in 

 peruvianus. On the posterior claws, which are longer and propor- 



