308 BULLETIN G3, UNITED STATES NATIONAL MUSEUM. 



Female. — Genital segment trianiiiilar or triangulo-parabolic in out- 

 line. 



Valvulce. — Dorsal plates oblong, with a few scattered punctures 

 and' seise, apical margins not always well defined (see Synopsis) ; 

 ajiices membranous or chitinous, alwaj^s finely setose, generally with 

 a pencil of longer hairs at tip (penicillate). 



Afyendage small, mammilliform and penicillate. Superior pu- 

 dendal membrane. nearly attaining the apical fourth of the dorsal 

 plate, or only the middle {cordata) ; genital fissure in the apical third 

 of the segment. 



General characters. — The crural characters are quite variable with- 

 in certain limits in each species. The profemora are more or less 

 clavate, the mesofemora at times feebly so in external two-thirds; 

 the metafemora have their opposed surfaces quite i^arallel. 



The protibise are at times subcarinate in basal half externally and 

 the tarsal grooves are not developed, although sometimes indicated; 

 the mesotibise are frequently obsoletely grooved on their external sur- 

 faces, and the metatibia^ more or less flattened on those -surfaces. 



The articular cavities are closed on all the tibia?. 



The relative lengths of the tarsi and of the joints in each are prac- 

 tically the same as in the other subgenera. 



The protarsi of the male are a little longer than in the female. 



The stoutness and length of the legs ditfer very much in the same 

 species, but for purposes of comparative measurements, normal ex- 

 amples have been selected. 



Distrilmtioii. — Of the seventeen species given in this pa})er all but 

 three occur in California ; out of six races only two are not found in 

 that State. 



Tihialis is apparently peculiar to Lowei- California ; lecontei to 

 Colorado and New Mexico; snowii to Colorado, New Mexico west- 

 ward to the Colorado River in Arizona; tenebrosa and its var. nana 

 to Nevada and eastern central and northern California. 



Incvlta may possibly occur on the mainland in California ; it is 

 authentically abundant on Santa Rosa Island oft' the Santa Barbara 

 coast; consohrina occurs from Los Angeles County to Siskiyou 

 Counts; scahrlpennis is from the Fort Tejon region; hlanchardil at 

 Indio and the mountains in eastern San Diego County; neotoimv in 

 southern California, and T have taken it in numbers from the wood- 

 rats nests on the hillsitles of ]\Iission Valley, San Diego County. 



Fuchsii occurs in the high mountains and forests of eastern Tulare 

 County; horniJ from the eastern c(Miti-al and northern parts of the 

 State. 



Parvicollis from ledges on the hills near the const in central i>arts 

 of the State; var. pJanata in the Avestern central, and producta. in the 



