- 
290 Mr. D. Sharp on the species 
are conspicuous, and the following are common to the 
two species :—The males have the middle tibie dilated, 
or slightly knobbed, inwardly at the apex; the pro- 
sternum is furnished along the middle with erect dense 
fine pale pubescence (which is frequently more or less 
rubbed off in worn specimens), and this is continued 
along the middle of the metasternum, where it diverges 
into two patches, which are continued along the inner 
margins of the hind coxe; also the lower (or hind) 
margins of the femora, as well as the trochanters, are 
more or less densely pubescent. The fifth ventral segment 
is longer than the preceding one, but not twice as 
long, and its hind margin is truncate, and furnished in 
the middle with a shallow broad angular emargination 
of somewhat variable shape and size; while in the 
female this plate is elongate, more than twice as long as 
the preceding one, and narrowed towards the extremity, 
where the raised margin is slightly interrupted in the 
middle by a minute notch, which in some individuals, 
and more especially in B. goliath, extends a good deal 
forwards. In the male the sides of the eighth dorsal 
segment are abruptly bent downwards, and thus a small 
arched notch is formed at the extremity of the segment ; 
in the female the edges of this plate are not depressed, 
so that it is flat transversely, and does not exhibit any 
distinct notch (there may be a very slight emargination) 
at the extremity. In the male there is a large sixth 
ventral plate concealed within the preceding segment ; 
the hind margin of this plate is cut away in a peculiar 
asymmetrical manner, the emargination being much 
larger and deeper on the left side than it is on the right ; 
the seventh ventral plate is, in the male sex, very visible ; 
it is punctate where exposed, and metallic in colour, and 
deeply impressed on each side of the middle; the dorsal 
plate attached to this terminal ventral plate consists 
apparently of two plates united together by a strongly 
angulate transverse suture; the basal of these two is 
smooth, polished, and shining, while the terminal one is 
densely punctate and finely pubescent, and is triangular 
in form, the apex of the triangle being exposed, though 
it is quite retractile. The cedeagus is a very simple 
sublinear body, acuminate at the apex, and consisting of 
a large dorsal plate, and a small and short ventral plate ; 
this ventral plate is received in the larger dorsal plate, so 
as to be much concealed, and is membranous at its base, 
