580 Mr. T. Vernon Wollaston on the 
103. Tetracoptus {nov. gen.). — The present genus, the 
type of which (although very much smaller, and more 
lightly punctured) at first sight closely resembles Penta- 
mimus, is remarkable for its quadriarticulate funicidus, — • 
it being the only instance amongst the entire Cossonidce, 
outside the subfamily Dryoplitliorides, so far at least as I 
ha^'c hitherto observed, in -s^^hich that organ is composed 
of but four joints ; yet so unmistakeably is it a member, 
as regards the whole of its other details, of the lihyncoli- 
form groups that it would be as absurd to remove it on 
account of the structure of its funiculus into the Dryoph- 
thorides (with which in everything else it totally disagrees) 
as it Avould be to regard Pentamimus and Tomolips as 
Pentarthrids, or to include HexartJirum amongst the 
OnychoUpides. In point of fact there can be no question, 
despite its 4-jointed funiculus, about its affinities ; and it is 
a significant fact that the only exponents of the subfamily 
Cossonides in which the funiculus is made-up (so far as I 
am aware) of less than seven articulations should pertain 
to genera which appear, in a natural system of arrange- 
ment, to be at no great distance from each other, — namely 
Hexarthrum (in which the funiculus is composed of six 
joints), Tomolips and Pentamimus (in Avhich there are 
but five), and Tetracoptus (where the number is reduced 
to four). 
Apart however from the primary peculiarity to which I 
have just called attention, Tetracoptus may be known by 
its cylindrical body and very lightly sculptured surface ; 
by its exceedingly short and broad, but nevertheless pa- 
rallel, rostrum (which has a wide, but shallow, channel in 
front) ; by its elongate, large, subconical prothorax (which 
is about the same width i)osteriorly as the elytra, and is moi'e 
constricted in front than in Pentamimus); by the small- 
ness of its scutellum ; and by its abrupt, considerably- 
developed club. Its anterior coxEe are tolerably wide 
apart, and the four hinder ones are about equidistant ; its 
legs (especially as regards the tibite) are somewhat short, 
its third tarsal joint is simple, and its claws are minute. 
The single example of this genus from which my diag- 
nosis is compiled has been communicated by Mr. Pascoe, 
and was captured by Mr. Wallace at Dorey in New 
Guinea. 
104. XestcTdersia {nov. f/en.). — The present genus 
and the following one are a good deal allied to each other. 
