88 
Guide to Arachnida. 
Table-case superficial resemblance to scorpions, the Urotricha are known as 
No. 21. Whip-scorpions. All the known genera (which number ten) are 
referred to the family Thelyphonidae, which is now restricted 
Fig. 57. 
Whip-scorpion (Thelyphonus caudatus), x 2. 
to South-Eastern Asia and Tropical America. Of the genera, 
Thelyphonus , which is widely distributed in the Oriental region, 
is the richest in species. The largest known species of The- 
lyphonid ( Mastigoproctus giganteus), a species which is found 
in the southern part of North America, sometimes reaches a 
length of more than two and a half inches. In the Carboniferous 
period the family was represented by the genus Geralimirci, 
which has been discovered both in Europe and in North 
America. 
Whip-scorpions live beneath stones or fallen tree-trunks, or in 
burrows in the soil. They feed mostly on insects, which they 
