TRACHEAHI^. 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 cheliccrae 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 tAvo genera. 



Galeodes, 0//r. — Solpuga, Licht., Fab. 



Two very large chelicerse, 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 

 pairs 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. 



