No. 3. — New Spiders of the Family Aviculariidae. 



By Ralph V. Chamberlin. 



The new genera and species described in the present paper were 

 brought to light in studying the unworked collection of Aviculariidae 

 that has been accumulating for many years in the Museum of Com- 

 parative Zoology; all the types and paratypes are in the collection of 

 the Museum. 



PYCNOTHELINAE, subfam. nov. 



Eyes elevated on a distinct tubercle, in a single group; anterior 

 median eyes much the largest. 



Labium immovably fused with the sternum; spinules at apex few 

 (or none). 



Coxae of palpi long, not at all produced into an apophysis at the 

 distal end; spinules present in an area at proximal end (or absent). 



Chelicerae without rastellum. 



Tarsi of legs with no unguiculi f asciculares ; no inferior claw pres- 

 ent; paired claws bearing each a double row of teeth. 



No stridulating apparatus present. 



Superior spinnerets short, contiguous or subcontiguous; distal 

 article much shortest, nearly as broad as long, rounded. Inferior 

 spinnerets small, contiguous or subcontiguous. 



So far as known, tibia I in the male is without spur. 



This subfamily has similarities to the Diplurinae, but differs con- 

 spicuously in having the labium immovably fused to the sternum 

 and in the short contiguous superior spinnerets. In addition to the 

 new Brazilian genus Pycnothele, described below, I think Lycinus of 

 Thorell, described from Argentine, belongs here rather than in the 

 Diplurinae where placed by its author, though the original description 

 contains no statement as to the condition of the labium. The account 

 of the spinnerets would indicate their agreement with those of Pycno- 



