.")!() BIOLOGICAL SI'KVKV <»F 



Class ARACHNIDA 



Many of the following were collected by Dr. Charles H. 



Blake alone and also with the author. 



Order CHELONETHIDA (Pseudoseorpiones) 

 (False or Book Scorpions) 



Chthoniedae 



Chthonius C. L. Koch 



0. tetrachelatus (Preyssler). One specimen under a stone 

 on Bar Island, August 15, 1931. 



ClIERNETIDAE 

 Chelanops Nicolet 



C. sp. Under stones and logs, in damp places. Shore of Lake 

 Wood, Duck Brook Path, Salisbury Cove and Corfield. Very 

 common. 



Hesperochernes Chamberlin 



H. tamae (Beier). These are frequently carried into the 

 laboratory in October attached to the legs of the fly Pcgo- 

 myia lipsia and on no other. I have seen as many as two on 

 one fly and three on another. This is the first record for 

 this species in New England. 



Cheliferidae 



Chelifer Geoff roy de St. Hilaire 



C. cancroides (Linnaeus). One specimen taken in a house, 

 August 10, 1931. 



Xeomsiidae 



Microbisium Chamberlin 



\\. brunneum (Hagen). Penikese sifting, June 25. 



