308 ARACHNIDA—SCORPIONIDEA——PEDIPALPI CHAP. 
There are three sub-families, Megacorminae, EKuscorpiinae, 
and Chactinae. 
The MEGACORMINAE include but a single Mexican form, 
Megacormus granosus. There is a single toothed keel under 
the “ tail,’ and all the under surface is spiny. There is a row of 
long bristles under the tarsus. 
In the EuscorpirmnaE the upper surface of the hand is divided 
into two surfaces almost at right angles by a strong finger-keel. 
This is a small group of about six species found in the Mediter- 
ranean region. The two genera are Huscorpius and Belisarius. 
The CHACTINAE are without any marked keel on the hand. ° 
The scorpions of this sub-family are found in equatorial South 
America and the West Indies, where there are more than 
twenty species divided about equally between the four genera 
Chactas, Broteas, Broteochactas, and Teuthraustes. 
Fam. 5. Vejovidae.—No tibial, but two pedal spurs. A single 
row of hairs or papillae under the tarsus. Sternum generally 
broader than long. Hlongate stigmata, and three lateral eyes. 
Seven of the eight genera of this family include only 
American forms, the principal genus being Vejovis, with about 
ten species. The genus Scorpiops, however, belongs to the 
Indian region and numbers more than ten species. 
Fam. 6. Bothriuridae.—Sternum much reduced and some- 
times hardly visible, consisting of two slight, nearly transverse bars. 
Of the seven genera of this family one, Cercophonius, 1s 
Australian. The other six genera include some dozen South 
American forms, Bothriwrus having four species. 
Order II. Pedipalpi. 
Arachnids with non-chelate, two-jointed chelicerae, powerful 
pedipalpi, and four pairs of legs, of which only the last three are 
ambulatory, the first being used as tactile organs. The cephalo- 
thorax is usually covered by an undivided carapace, but the pedun- 
culated abdomen is segmented. Respiration is by lung-books. 
The Pedipalpi are a little-known group of animals of nocturnal 
habits. Though rarely seen they are widely distributed, being 
found in India, Arabia, the greater part of Africa, and Central 
1 Pocock, Fawna of British India, *‘ Arachnida.” London, 1900. 
