The chaotic taxonomy of the subfamily Ornithoctoninae
Pocock, 1895 is partially addressed, with a focus on redefining
the arboreal genera Lampropelma Simon, 1892, Omothymus
Thorell, 1891, and Phormingochilus Pocock, 1895. Previous
works placing heavy emphasis on unstable taxonomic characters
are addressed and stable taxonomic features presented for the
clear delineation of males of arboreal ornithoctonine genera.
The male of Phormingochilus everetti Pocock, 1895 is described
for the first time. A new species, Omothymus rafni sp. nov.
is described from historical material collected in Sumatra.
Lampropelma violaceopes Abraham, 1924 is transferred to
Omothymus based on comparative leg measurements and
geographical location comb. nov. Lampropelma nigerrimum
arboricola Schmidt & Barensteiner, 2015 is transferred to the
genus Phormingochilus with full species status acknowledged,
giving the new combination Phormingochilus arboricola
comb. nov. Omothymus thorelli Simon, 1901 is considered
a junior synonym of Omothymus schioedtei Thorell, 1891
syn. nov., based on similar morphology and geographical
locations. Phormingochilus carpenteri Smith & Jacobi, 2015
is transferred to the genus Lampropelma based on comparative
leg measurements and geographical location comb. nov.
Phormingochilus kirki Smith & Jacobi, 2015 is considered a
junior synonym of L. carpenteri syn. nov. Phormingochilus
fuchsi Strand, 1906 is transferred to the genus Omothymus based
on comparative leg measurement and geographic distribution
comb. nov. Phormingochilus tigrinus Pocock, 1895 is removed
from synonymy with P. everetti based on the lack of justification
for the synonymy comb. rest. Omothymus dromeus Chamberlin,
1917 is removed from Omothymus and returned to the restored
genus Melognathus comb. rest.