tJROTBICHA. 101 



Suborder UROTRICHA* 



Carapace un segmented, furnished at its fore extremity with a pair 

 of median eyes set close together and with a cluster of 3 lateral 

 eyes on each side, some distance behind the medians. Chela- 

 folding in a horizontal plane ; the coxa short, the tibia armed with 

 a long inwardly directed spine or apophysis, against which the 

 hand closes ; hand with a corresponding apophysis, the immovable 



Fig. 30. Thelyphonus indicits, <^. 



c, carapace ; o, first tergum of abdomen ; in, ommatoid or last segment of 

 abdomen; n, caudal flagellum ; z, trochanter; x, femur; a, tibial apo- 

 physis ; d, hand ; c, movable finger of chela ; b, tarsal segments of 1st 

 leg ; /, coxa ; ff, trochanter ; h, femur ; i, patella ; /, tibia ; k, protarsus ; 

 /, tarsus of 4th leg. 



finger, which forms with the movable finger a complete pincer ; 

 claw fused with extremity of movable finger. 1st kg with 

 tarsus consisting of 9 segments ; 2nd leg with coxa unarmed ; 

 2nd, 3rd, and 4th legs with tibia long and protarsus very 

 short, the extremity of the tibia often armed on the uuderside with 

 a slender spine, the tibial spine. Postanal skeletal piece consisting 



* I here restore for this group the very appropiate name which was given to 

 it by C. Koch. Thorell applied to it the term Oxopoei, or " acid-makers," in 

 allusion to the defensive pungent secretion the animals emit when handled. In 

 ordinary phraseology these animals are known as " Whip-Scorpions." 



