140 Mr. G. J. Arrow on 
antennal club characteristic of Amblyopus, whilst others 
associated with it by Gorham have small, finely facetted eyes 
and very short, broad, and closely articulated club-joints, as 
in Petaloscelis. It is true that they all agree in inhabiting 
Africa, but, in spite of that, their structural diversity pre- 
cludes their association in a single genus. 
The type of Petaloscelis is a Burmese insect, P. instabilis, 
Gorh. Kuhnt has joined with it a very different species, 
Krotylus rubens, Hope, although I had already stated that 
to be a Nestriplaz, With P. instabilis “* Amblyscehs”’ 
pallidus and hemorrhous of Gorham may be associated, 
and A. kelleni and brunneus, Gorh. (and perhaps A. gorhami, 
Gestro), are synonyms of the last. Another species is 
“ Zythonia”’ anthracina, Gorh., incomprehensibly referred 
to a genus to which it has no resemblance. Equally mys- 
terious is Gorham’s simultaneous redescription of the true 
Zythonia (Z. fulva, Westw.), a striking and unmistakable 
insect, as Lophocrotaphus guinecnsis. 
To the genus Amblyopus I refer “ Amblyscelis” ferru- 
gineus and vittipennis, Gorh., the latter name, as well as 
Triplax dorsalis, Kolbe, being synonymous with Triplax 
marginata, Qued. A. nigripennis, Arr., I am now satisfied 
is the same as Amblyopus natalensis, Crotch. 
I do not know the species for which Gorham has made the 
genus Pycnogeusteria, but, as he has indicated no features of 
any generic significance by which it can be distinguished from 
Petaloscelis, 1 think it will be best to regard it as synonymous 
with that. 
In ‘Notes from the Leyden Museum,’ 1888, p.147, Gorham 
has changed the name Cyrtotriplax (Tritoma) senegalensis, 
Crotch, to Amblyopus rotundatus (omitted from Kuhnt’s 
Catalogue), but without reason, for Crotch’s species agrees 
well with Tritoma. Petaloscelis nigrinus, Gorh., and several 
other African species are now added to this genus. They 
differ considerably in the form of the tibiz and antennee, but 
the transition is gradual from species to species, and I have 
found nothing to justify adding to the already too numerous 
genera. 
Closely related to Tritoma is the peculiar genus Paleolybas, 
which has never been adequately described, although various 
species have been named by Crotch and Gorham. It has 
been quite unnaturally placed with South-American forms 
on account of its globose shape. In reality, it differs from 
Yritoma only in minor details, viz. the shape of thé body, 
short legs, feeble antenne, and broadly bilobed prosternum. 
An important feature hitherto overlooked is the marked 
