540 Mr. R. I. Pocock on some 
LXIX.—Some new and old Genera of S.-American 
Aviculariide. By R. I. Pocock. 
I HAVE elsewhere shown, in the works cited below, that the 
most satisfactory basis for a phylogenetic classification of the 
spiders referred by Simon to the Aviculariine is furnished 
by the stridulating-organs, or rather hairy structures that are 
found between the base of the mandible and palp or palp 
and first leg. By their structure, in conjunction with other 
features, the spiders in question fall into a series of natural 
groups *, each of which, with the exception of the last, is 
confined to a definite geographical area. 
The following list shows the distribution of these sub- 
families and the genera they contain :— 
1. ORNITHOCTONINA : Cyriopagopus, Sim. (= Omothymus, 
Thor.) ; Melopewus, Poe. ; Urnithoctonus, Poc.; Citharo- 
gnathus, Poc.; and Phormingochilus, Poc. (?= Lampro- 
pelma, Sim., or Haplopelma, Sim.). 
Distribution. Burma and Siam, Celebes and Halmahera. 
2. Harpactirins#: Harpactira, Auss.; Pterinochilus, Poc. ; 
Ceratogyrus, Poc.; and Hucratoscelus, Poc. 
Distribution. East and South Africa from Somaliland to 
Cape Colony. 
For the characters of these genera see Proc. Zool. Soe. 
1897, p. 745, and 1898, p. 500. 
3. THRIGMOPGINA: Haploclastus, Sim., and Thrigmopeus, 
Poe. 
Distribution. S. India. 
For tabulation of the characters see ‘Fauna of British 
India,’ Arachnida, p. 184 (1900). 
4, SELenocosmun«® : Pacitlotheria, Sim.; Chilobrachys, 
Karsch (=Musagetes, Poc.) ; Selenocosmia, Auss. (= 
Phlogius, Sim.) ; Lyrognathus, Poc.; Phlogiellus, Poe. ; 
Coremiocnemis, Sim. ; Selenotypus, Poc.; and probably 
Orphneecus, Sim. 
Distribution. Oriental Region (India to Australia). 
For tabulation of characters of these genera see Ann. & 
* It is a matter of no great moment whether we term these groups 
subfamilies with the termination -2v@ or sections with the termination -ee. 
The main point to be borne in mind is that they are natural and not 
artificial assemblages like the ‘ Selenocosmies,” “ Cheetopelmatez,” &e, 
of Simon, Hist, Nat. Araign. i. (1892). 
