d- 



^l\t %jm'dm\ mtomU^, 



VOL XXIII. LONDON, AUGUST, 1891. No. 8. 



NOTES ON NORTH AMERICAN CHERNETID^. 



BY NATHAN BANKS, ITHACA, N. Y. 



The North American genera of Chenietidce, so far as recognized, may 

 be separated by the following table : — 



'Cephalothorax with a transverse suture ; mandibles small 

 ( Chelifei-iiice) 2 



Cephalothorax without a transverse suture ; mandibles larger 

 ( Obisi7ice) 3 . 



i' 



TFour eyes Garypics 



2-| Two eyes Chelifer 



INo eyes Chelaiiops 



I Mandibles with apophysis or stylet 5 



(Mandibles without apophysis 4 



Fingers straight; cephalothorax wider in front than behind 

 ChtJwnius 



Fingers curved ; cephalothorax narrower in front than behind 

 Obisium 



(Eyes inconspicuous or absent Atenmus 



" [Four distinct eyes Olpitim 



The two subfamilies may, I beUeve, be farther separated by the fact 

 that the Cheliferince have the dorsal scutse of the abdomen divided by a 

 median line ; while in the Obisince the scuttc are entire. Chernes 

 pallidiis, Banks, which was described as having the median line wanting, 

 really has a median line, though on account of the light colour of the 

 abdomen it is very difficult to trace. The Cheliferince have an apophysis 

 or small stylet near the end of the mandibular finger. In the more 

 typical Obisince this is lacking, but in Ateinnus and Olpium it is present. 

 Clubbed hairs are frequently present in the Cheliferince, while they are 

 not found in our forms of Obisince. 



