434 
CLASS ARACHNIDES. 
their two anterior tarsi are short, of the same size, and with 
but few articulations. 
The others have the abdomen intimately united to the 
thorax in its whole breadth, presenting at its lower base two 
mobile laminae in the form of a comb, and terminated by a 
knotted tail, armed with a sting at its extremity; their 
stigmata are eight in number, uncovered, and disposed four by 
four on each side, through the length of the belly ; their an - 
tennce pincers (forceps) are terminated by two claws, the ex- 
terior of which is mobile. They form the genus 
Scorpio, 
Which have the body long, and terminated abruptly by a 
long and slender tail, composed of six knots, the last of which 
finishes in an arched and very sharp point, or in a dart, under 
the extremity of which are two small holes, serving for an 
issue to a poisonous fluid, contained in an interior reservoir. 
Their thorax, in the form of a long square, and generally 
marked in the middle with a longitudinal furrow, has at each 
side, near its anterior extremity, three or two simple eyes, 
forming a curved line, and towards the middle of the hack 
two other simple eyes approximated ; the palpi are very large, 
with a talon at the end in the form of a hand; their first 
articulation forms a concave and rounded jaw ; at the origin 
of each of the four anterior feet, is a triangular appendage, 
and these pieces form, by their inter-approximation, the ap- 
pearance of a labium with four divisions, the two lateral of 
which may be considered as kinds of jaw r s, w r hile the two 
others form the tongue ; the abdomen is composed of twelve 
rings, comprehending those of the tail; the first is divided into 
two parts, the anterior of which supports the sexual organs, and 
the other the two combs. These appendages are composed of 
one principal piece, narrow^, elongated, articulated, mobile 
at its base, and furnished along its lower side with a series 
