424 THE AMERICAN NA TURALIST. [Vor. XXXIV. 
tella. The exact number of species occurring in our country 
is uncertain, owing to the fact that several Mexican species 
may be found in southern Texas. 
-_ 
M 
y 
» 
uua 
. 
9 
P. 
oo 
ND 
kami 
9 
— 
La 
. Only two lateral xA sternum broad, pentagonal; small short species 
m. Chacti E Broteas alleni Wood. e Ca pes 
Three to five lateral ne : ; 
Sternum broad, pentagonal, inai no spine i ads the E. . 3 
Sternum long, triangular, usually a spine under the sting . . . 14 
At base of last tarsal joint at least one spur on inner and one on 
outer side ; no spine under the sting . . . (fam. Vejoviide) 6 
At base of last tarsal joint only one spur, which i is on the outer side ; 
sometimes a hump under the sting . . . (fam. FE 4 
A hump under the sting 
No hump under sting; TNR ERE deed PERRERA on anterior 
margin, cauda small, claws large, color dark 
isthacanthus elatus Gerv. (S. Fla.) 
Comb with six to eight teeth. . Diplocentrus lesueuri Gerv. (Fla.) 
Comb with twelve to fifteen teet 
Diplocentrus whitei Gerv. (Tex., Cal.) 
Central area of each comb divided into at least eight small pieces 8 
Central area of each comb divided at most into six small pieces 7 
Movable finger with at least five small teeth, sting of $ as usual 
Uroctonus mordax Th. (West Coast) 
Movable finger with at most three small teeth, sting of ¢ swollen at 
Uroctonus phaiodactylus Wood. (Cal., Utah) 
ase 
: Pénullimate teu joint of three front legs with long hairs on back; a 
strong tooth near the under edge of the movable mandibular fin- 
ger; very large and hairy 
Hadrurus hirsutus Wood. (Southwest) 
No hairs on back of these tarsal joints, no tooth near tip of under edge 
of movable mandibular finger, smaller species . . . (Vejovis) 9 
. Hand with distinct ridges or keels, more or less granulate . . to 
Hand smaller, without keels, the corners rounded and smooth . 12 
On the underside of the first caudal segment the median keels are dis- 
tinct and sharp, although fine, the sting is very slender and long 
Vejovis punctipalpi Wood. (N. Mex., Nev.) 
On the underside of the first caudal segment there are no median keels 
or extremely indistinct, the sting of ordinary length . 
. Hand strongly keeled, no keels on hind tibiz, color yellowish or green- 
is 
. Vejovis boreus Gir. (Neb. to Idaho, Utah, and Nev.) 
Hand bh hatoi keeled, hind tibiæ with very plain keels, color uni- 
form reddish-brown, legs paler . Vejovis mexicanus Koch (Tex.) 
On under side of first caudal segment the median keels are plain, but 
