TRACHEARI>«. 
315 
ligula constitute a sucker. Most of these animals, however, being 
very small, great difficulties necessarily accompany these investi- 
gations, and it is readily perceived that such characters should only 
be resorted to when it is impossible to avoid it. 
FAMILY I. 
PSEUDO-SCORPIONES. 
In this family we find the thorax articulated, its first segment much 
the largest, and resembling a corselet ; the abdomen is very distinct 
and annulated, and the palpi very large and in the form of legs or 
claws. .,There are eight legs in each sex, with two equal hooks at the 
extremity of the tarsi, the two anterior ones, at most, excepted, and 
two apparent chelicerfe terminated by two fingers and two toes, formed 
by the first joint of the palpi. They are all terrestrial, and have an 
oval or oblong body. This family comprehends but two genera. 
GaleodeSjO//?'. — S oLPUGA, Licht., Fab. 
Two very large chelicerae, with strongly dentated vertical fingers, one 
superior, fixed, and frequently furnished at its base with a slender, 
elongated, pointed appendage*, and the other moveable; large pro- 
jecting palpi in the form of feet or antennae, terminated by a short, 
vesicular joint, resembling a button without a terminal hook ; the two 
anterior feet of an almost similar figure, equally unarmed, but 
smaller; the others terminated by a tarsus, the last joint of which is 
furnished at the end with two little pellets, and two long toes termi- 
nated by a hook ; five semi-infundibuliform pediculated scales on each 
posterior leg, arranged in one series along their first joints ; and two 
eyes closely approximated on an eminence anterior to the first tho- 
racic segment, which represents a large head bearing the two anterior 
feet, as well as the parts of the mouth. 
Their body is oblong, generally soft, and bristled with long hairs. 
The last joint, of the palpi according to M. Dufour, contains a parti- 
cular organ formed like a disk, of a nacre-white, and which never 
protrudes unless the animal is irritated. The two anterior feet may 
be considered as second palpi. The labrum has the form of a little, 
strongly compressed, recurved rostrum, pointed and hairy at the end. 
The ligula is small, shaped like a keel, and is terminated by two 
divergent, bearded setae, each posted on a little joint. The other 
j)airs of legs are annexed to as many segments, I have perceived a 
large stigma on each side of the body, between the first and second 
pair of legs, as well as a slit at the base of the inferior part of the 
abdomen. The abdomen is oval, and composed of nine annuli. 
* I do not think it is peculiar to either sex. 
