l8o CALIFORNIA ACADEMY OF SCIENCES. 



For reasons mentioned in my " Beitr. Z. Kenntn. Cal. 

 Coll.," p. 20. I think that the above form is to be referred 

 to the genus Entomobrya Rond., and I am confirmed in 

 my opinion by my having found in the materials now at 

 my disposal two species of the above genus, the one of 

 which is characterized by three ocelli, the other by one 

 on each side of the head. The plumiform setae, charac- 

 teristic of the genus Sinella Brook, which are hanging 

 down on the sides of the mucronal segment, though less 

 developed, are to be seen on all the species belonging to 

 the genus Entomobrya Rond. The other characteristics 

 of Sinella, the shape of the upper claw and the absence 

 of swelling on the tibial tenent hair, seem to me to be in- 

 sufficient as foundation for a separate genus. 



Of this very interesting type I have a specimen from 

 Sebastopol, California (coll. G. Eisen). Before only 

 known from Finland (Reuter) and England (Brook). 



Entomobrya sexoculata n. sp. 



Violet. The eyes are six, three on each side of the head. 

 The three outer joints of the antenna? are of about the 

 same length. The upper claw is provided with three 

 teeth. The lower clazv is lanceolate and unarmed. The 

 mucro is provided tuith two hooks. Length 1 .5 mm. 



Well characterized by the number and arrangement of 

 the eyes. They are three on each side of the head and 

 are as appears from the figure. Of the teeth of the large 

 claw two are placed close to each other, but they do not 

 exceed the uncoupled tooth in size. A tibial tenent hair 

 directed upwards is to be seen. The caudal appendage 

 is very long and has the dentes one -fourth longer than 

 the manubrium. The mucro has two developed hooks 

 and a small spine directed backwards. 



The body is richly clothed with hairs. The color of 



