72 CALIFORNIA ACADEMY OF SCIENCES. 



Cryptobium. This genus is not well represented in 

 California, californicum being the only species known 

 from west of the mountains; it is not rare, especially in 

 the foot-hills and mountains. C. tumidum is recorded 

 from California, Arizona and Utah, and is doubtless 

 confined to the region east of the mountains. I have 

 taken females of an undetermined species at Yuma. 



Lathrobium. L. puncticeps, rather rare : jacobinum, 

 very common along any of the streams from the Sierras: 

 californicum, rare, Pomona, May ; Redondo beach, 

 March : lituarium, a few specimens taken at Indio and 

 Yuma : subseriaium occurs in the northern part of the 

 State. There are three undescribed species in my col- 

 lection, one from Southern California (Pasadena), and 

 the other two from the north. 



Caloderma. C. rugosa, C. mobilis and C. reducta are all 

 abundant under vegetable debris near water, occurring 

 sometimes in great numbers in damp places in the 

 mountain canons: continens is recorded from San Diego; 

 it is probably not different from rugosa. Three species 

 not yet determined have been found in. the canons near 

 Pomona. 



The other species described by Casey angulata, con- 

 tracta, luculenta and tantilla occur in the middle and 

 northern parts of the State. 



Oligopterus. 0. cuneicollis, San Francisco. 



Medon. M. malaca occurs in the same situations as 

 the species of Caloderma, but specimens are not quite so 

 numerous: latuiscula, " Southern California and Lake 

 County" (Casey). Several unidentified species are from 

 Southern California, while the following are from mid- 

 dle and northern California: sinuaticollis, convergens, 



