312 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, 
Uropyal, or tailed Pedipalpi, while the Tarantulidae constitute 
the remaining sub-order AMBLYPYGI, the members of which are 
tailless. 
Fam. 1. Thelyphonidae.'.—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), Labochirus (Ceylon), Hypoctonus 
(Burma), Wimoscorpius (Philippines), Uroproctus (Assam), Abalius 
(New Guinea), without ommatoids, and Zetrabalius (Borneo), 
with two pairs of ommatoids. 
Fam. 2. Schizonotidae (= Tartaridae).—This family con- 
tains only two genera, Schizonotus (= Nyctalops, Pickard- 
Cambridge, nom. preoce. Aves) and TVvrithyreus” (= Tripeltis, 
Thorell, nom. preoce. Reptilia). 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 7. 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. 
