178 CALIFORNIA ACADEMY OF SCIENCES. 



Habitat. San Miguel de Horcasitas, Sonora, and 

 Tepic, Mexico. (Coll. Eisen and Vaslit.) 



Gen. IV. Entomobrya Rondani. 

 Entomobrya caeca n. sp. 



White. The eyes are wanting. The antennce have the 

 third joint pear-shaped, about half as long as the terminal 

 joint. The upper claw is provided with three teeth, the 

 two inner of which are very strong. The lozuer claw is 

 running out into tzvo diverging points. The mucro is 

 provided with one hook. Length 1 nun. 



The upper claw is formed in the same manner as in the 

 forms which have before constituted the genus Sinella 

 Brook. The lower claw is unarmed on the inner margin, 

 furnished on the sides with longitudinal ridges, and has 

 an appendix hanging downwards which consists of an 

 extremely thin chitinous lamel, running out into a point. 

 The claw, therefore, seems to be two-pointed. On the 

 tibia a tenent hair, swollen at the end, can be observed. 



The hairs of the two specimens which I have at my 

 disposal are very scarce. Groups of club-shaped seta? 

 are, however, to be seen on the posterior part of the head 

 and between the forward thoracic segments. 



Habitat. San Francisco, California. (Coll. G. Eisen.) 



Entomobrya binoculata n. sp. 



White. The eyes are two, one on each side of the head. 

 The terminal joint of the antenna, is nearly twice as long 

 as the third. The upper claw is provided with three teeth, 

 of which the two interior arc very strong; and are placed 

 beside each other. The lozver claw is lanceolate and un- 

 armed. The mucro is provided with two hooks. Length 

 i.j mm. 



Easily to be distinguished from preceding species by the 

 number of the eyes. The antenna} have the two middle 



