426 THE AMERICAN NATURALIST. [Vor. XXXIV. 
22. A small pale median spot on the anterior border of the cephalothorax, 
legs pale yellow, cauda pale 
Centrurus carolinianus Beauv. (S. States) 
No such median spot on anterior margin of the cephalothorax, legs 
marmorate with brown, cauda brown, dark stripes on cephalothorax, 
broader than in preceding — . . . Centrurus Aentzi Bks. (Fla.) 
SOLPUGIDA. 
These curióus arachnids are strongly separated from all 
other groups by various characters. There isa pair of thoracic 
stigmata; the cephalothorax is divided into three parts, the pos- 
terior two not covered with a chitinous shield; the mandibles 
Fic. 4.— Eremobates. a, coxal appendages. 
are very large and porrect ; the hind coxze bear several T-shaped 
appendages; the hind trochanters are bisegmented ; the coxa 
are approximate, so that there is no sternum, The body is not 
depressed in the slightest —a rare character in the other Arthro- 
gastra (except Phalangida). 
The species live in wild desert, often sandy, regions, and wan- 
der chiefly at night. Our genera and species may be tabulated 
as below. 
4 
. Anterior margin of the cephalothorax rounded, sloping each side 
i; mmotrecha) 9 1 
Anterior margin truncate... , s ..... . (Eremobates) 2 ? 
. Movable finger of $ mandibles with two large subequal teeth with den- 
üee between them ee x 3 
Movable finger with but one large tooth, others much smaller . 4 
Some short conical spines under tibia of the palpus in both sexes 
Eremobates sulbhurea Sim. (Colo., N. Mex.) 
No such spines under tibia in either sex 
Eremobates formicaria Koch (N. Mex.) 
N 
LM 
1 Ammotrecha, ».#. for Cleobis Simon (1879), not Dana ( 1847). 
2 Eremobates, #.”. for Datames Simon (1879), not Stal (1875). 
