10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



KHY TO THE UNITED STATES SPECIES OF VABJOVIS ' 



A\ Hands provided with ridges or lieels and granular. 



B\ Caudal vesicle densely beset with long hairlik6 setae, some of which 



equal the sting in length V. hirsuticauda Banks. 



B'. Caudal vesicle practically bare. 



C\ Ventral keels distinct on all the segments of postabdomen ; sting 



about as long as the vesicle from which it arises. 



D\ Second and third segments of postabdomen longer than broad. 



E'. Middle dorsal keel hand well developed, as prominent 



as the others ; sting curved throughout and a little longer 



than the vesicle that bears it V. punctipalpis Wood. 



E*. Middle dorsal keel of hand obsolete; sting curved distally 



and shorter than vesicle V. yosemitensis, new species. 



D". Second and third segments of postabdomen broader than long. 



V. minimus Kraepelin. 



C^ Ventral keels on first two segments of postabdomen vestigial or 



wanting ; sting not over two-thirds as long as the vesicle from 



which it arises. 



D\ Integument smooth or finely granular. A light yellowish brown 



or greenish species V. boreus Girard. 



D'. Integument coarsely granular. A dark reddish brown species. 



V. mexicanus Koch. 

 A\ Hands without keels and smooth. 



B^. Segments IV and V of postabdomen stouter than those in front of them ; 

 color greenish or yellowish, with broad, indistinct, yellowish, median 

 stripe on dorsum of abdomen and 4 dark longitudinal lines on under 



side of postabdomen V. spinigerus Wood. 



B'. Segments IV and V of postabdomen scarcely as stout as those in front 

 of them. 

 C\ Hand slender, not swollen on inside, about twice as long as wid& ■ 



Western species ▼. flavus Marx 



C\ Hand not slender, markedly swollen on inside, about one and a 

 half times as long as wide. 

 D\ Segments III and IV of postabdomen without ventral subme- 



dian keels. Eastern species V. carolinianus Beauvois. 



D'. Segments III and IV of postabdomen with ventral submedian 

 keels. Western species V. subcristatus Pocock. 



VAEJOVIS HIRSUTICAUDA Banks 



Banks (1910) has described a scorpion of this genus with a very 

 hairy tail. It is reddish brown, very granular, with a slender and 

 very strongly keeled postabdomen, the vesicle of which is brushy 

 because of the large number of hairlike setae it bears. The length 

 is about 31 mm. It was taken in San Bernardino County, Calif. 



VAEJOVIS PUNCTIPALPUS Wood 



V. pimctipalpvs is a long species, larger specimens being 6 cm. in 

 length, with a well developed postabdomen. The hands are stout 

 and keeled. It is of a uniform reddish brown color. 



* The species described by BorelU as V. ailvestrii is not included in this key, as its status 

 is somewhat in doubt. 



