EDV. ELLINGSEN. 



Genus Ideobisium Balzan. 



There was one specimen of the genus Ideobisium in the 

 collection, taken at Ooyama; but the animal was too young to 

 be either determined or described. 



Genus Microcrea^gris Balzan. 



It may be rather difficult to support the genus Microcreagris, 

 as there is little difference between this genus and the subgenus 

 Ideobisium s. s. of the genus Ideobisium. The new Japanese 

 species prove that Balzan's characters for the genus may vary; 

 the céphalothorax is not always somewhat square, but may be longer 

 than it is wide. The mandibles are not always of the same length as 

 the céphalothorax, but may be shorter. Balzan gave as a differen- 

 tial character of Ideobisium and Microcreagris, that in the former 

 genus the galea should be simple, without teeth or branches, and 

 in the latter it is branched ; but this is no longer the case, for 

 Ideobisium (Ideoblothrus) Strandi Ellingsen, from Norway, has 

 a branched galea. The solution of the question should, however 

 be postponed until more species of the two genera are known. 

 The three (or four) known forms of Microcreagris may be 

 distinguished from each other in the following manner: 



Femur quite smooth 1 



Femur distinctly granulated 2 



1. Large species (7.1 mm.), galea with only some small teeth 

 at the extremity, céphalothorax as long as it is broad, front 

 margin of ceph. with a large tooth . M. gigas Balzan. 

 Considerably smaller (about 4 mm.), galea sometimes has 

 branches with teeth, ceph. sometimes longer than it is 

 wide, front margin of ceph. with a small tooth 



M. gigas Balz, var japonica £11. 

 2. Species of moderate size (about 4 mm.), femur robust, tibia 

 subglobose, fingers scarcely longer than hand, galea with 

 two dentated branches springing from the middle 



M. granulata Ell. 



