3 I 2 ARACHNIDA PEDIPALPI CHAP. 



Classification. The order Pedipalpi is divided into three 

 families Thelyphonidae, Schizonotidae and Tarantulidae. The 

 first two are considered by some authors to form a sub-order, 

 UROPYGI, or tailed Pedipalpi, while the Tarantulidae constitute 

 the remaining sub-order AMBLYPYGI, the members of which are 

 tailless. 



Fam. 1. Thelyphonidae. 1 This family comprises nine or 

 more genera, differing chiefly in the position of the eyes, the 

 structure of the genital operculum, the armature of the pedipalps, 

 and the presence or absence of " ommatoids " in the anal 

 segment. 



The three following genera are among those most likely to be 

 met with. Two ommatoids are present in each. 



Thelyphonus has a spine on the second ventral plate, and a 

 deep median impression on the male genital operculum, which is, 

 however, absent from that of the female. There are about fifteen 

 known species of this genus, inhabiting Southern Asia and the 

 East Indies. 



Typopeltis has ridges running forward from the lateral eyes. 

 The middle third of the female operculum is raised and deeply 

 impressed in the middle. This genus is represented in China 

 and Japan. Mastigoproctus has a short and stout coxal apophysis 

 of the pedipalp, without a tooth on its inner side. It is found 

 in Mexico, Brazil, and the West Indies. Other genera are 

 Thelyphonellus (Demerara), Ldbochirus (Ceylon), Hypoctonus 

 (Burma), Mimoscorpius (Philippines), Uroproctus (Assam), Abalius 

 (New Guinea), without ommatoids, and Tetrabalius (Borneo), 

 with two pairs of ommatoids. 



Fam. 2. Schizonotidae ( = Tartaridae). This family con- 

 tains only two genera, Schizonotus ( = Nyctalops, Pickard- 

 Cambridge, nom. preocc. Aves) and Trithyreus 2 ( = Tripeltis, 

 Thorell, nom. preocc. Eeptilia). They are very small, pale-coloured 

 forms (about 5 mm. in length), found in Burma and Ceylon. 



Fam. 3. Tarantulidae, better known as Phrynidae. 

 Pocock has shown that Fabricius established the genus 

 Tarantula from the species T. reniformis in 1793, while there 

 is no earlier record of Olivier's Phrynus, established for the same 

 species, than Lamarck's citation of it in 1801. The family is 



1 See Pocock, Ann. Nat. Hist. (6), xiv., 1894, p. 120. 

 2 Kraepelin, Das Tierreich, Berlin, 8. Lief., 1899, p. 234. 



