146 
Erichson’s. The remaining 28 are Pascoe’s. Among these there 
are only five (all of them Pascoe’s) that I am not able to assign 
a place in a tabular arrangement ; for which comparatively satis- 
factory state of things I am largely indebted to Mr. G. Masters, 
of Sydney, who furnished Mr. Pascoe with a large proportion of 
the specimens on which he founded his genera, and having re- 
tained examples in his own collection, has generously placed them 
in my hands during the time that I have been working on the 
present memoir. As the diagnoses of the five genera that I have 
been unable to identify are quite insufficient for distinction from 
the diagnoses of other genera, it is quite possible that I may have 
re-named some of them ; nevertheless, as they all happen to have 
been founded on species from W. Australia, and none of my new 
genera are founded on W. Australian species, the probability is 
that they all represent forms that have not come under my notice. 
Although their characters are not sufficiently indicated by Mr. 
Pascoe to enable me to assign these genera a place in a general 
tabulation of the group, I have nevertheless been able to place 
them, on the-strength of the few characters that their author 
mentions, in a short separate tabulation that I have drawn up. 
Subject to the remarks that will be found further on regarding 
the genus Xeda, I may add that the two tabulations I supply 
may be relied on absolutely as far as they go, for in the case of 
every genus that I have. tabulated the characters have been taken 
either from an authentic type or from the author’s own diagnosis. 
In no case have I introduced into the tabulation characters passed 
over by the author in silence unless I have had an authentic 
type before me. The name that would be assigned to any speci- 
men by comparison with the tabulation is the generic name of 
that species, subject only to the inevitable condition that it may 
be a species requiring a new generic name on the ground of its 
differing from the type of the genus in respect of some character 
that is mentioned neither in the tabulation nor in the author’s 
diagnosis. 
There are several terms made use of in the tabulation that it 
is desirable to explain clearly. The first is the term “ quad- 
rangular” as applied to the rostrum ; it signifies that the rostrum 
differs from the ordinary furm (more or less cylindric) of that 
organ through its sides being abruptly vertical and thus at right 
angles to the upper surface. The next term is “subapical,” or 
‘“submedian,” or “subbasal” as applied to the scrobe of the 
rostrum, and which refers to the front extremity of the scrobe. 
The third term requiring definition is “divergent” or ‘“ divari- 
cate” as applied to the claws, the former meaning that the dorsal 
border of each claw holds a direction at right angles to the direc- 
tion of a longitudinal line passing down the tarsus (as in the 
