chamberlin: new spiders of the family aviculariidae. 61 



The plumose bacilHform bristles of the stridulating organ occurring 

 on coxae of palpus and first legs as well as on the trochanters as usual. 

 No plumose hairs are present on the anterior surface of leg I. 



Metatarsus I and II scopulate to base, III to middle, and IV only 

 at distal end. 



Leg I in the male with the metatarsus straight. Inferior process 

 of tibia long and of moderate slenderness, curving away from joint 

 and then more strongly dorsad; the metatarsus when joint is flexed 

 closes against the adaxial surface of tip of this process. Superior 

 tibial process much shorter and proportionately stouter than the 

 inferior one toward which it is slightly bent, relatively considerably 

 shorter than the corresponding process in P. cancerides. 



Tibia of the palpus in the male moderate in thickness, narrowest 

 distad; bearing on ectal side a broad, low, and rounded tubercular 

 elevation which is proportionately larger than that in P. cancerides, 

 but is considerably less conspicuous than that in species of Acantho- 

 scurria. Spine of bulb of palpal organ long, uniformly narrowing 

 toward tip, curving rather strongly but evenly toward distal end, 

 smooth. 



Male (type). — Length, 35 mm. 



Cephalothorax: length, 18.2 mm.; width, 17 mm. 



Female. — Length, 36 mm. 



Cephalothorax: length, 17.5 mm.; width, 15.6 mm. 



fem. tib. +pat. met. tar. total 



This species is like P. cancerides (Latr.) in lacking plumose hairs 

 on the anterior surface of femur I; but it is a much smaller species 

 and in the male differs in ha\nng metatarsus I straight instead of 

 conspicuously bowed; in the smaller proportionate length of the 

 upper tibial process; in the more marked tubercle on tibia of palpus; 

 etc. 



