1902. ] SPIDERS FROM BORNEO AND SINGAPORE. 241 
The general colour of the beetle is reddish ochreous, the prothorax 
is clothed with a fine golden pubescence ; the prominent black 
eyes, the somewhat flattened antenn, and long hind legs closely 
correspond with the same organs of the Salius; further, the 
elytra, though not shortened, are much reduced in width, rapidly 
narrowing from a breadth of 3°5 mm. at the base to 1 mm. at the 
apex, so that the clear golden wings are very imperfectly hidden 
and add not a little to the general wasp-like appearance. When 
seized, this beetle curved down its abdomen in the most charac- 
teristic wasp-lke manner, and it was only with the greatest 
reluctance and most careful precautions that my Dyak collectors, 
to whom I pointed out the insect, captured it. As inthe Obereas, 
no representatation has here been made in dorsal view of the 
wasp-waist of the model, and for the same reason, namely, that 
this is hidden, when the Salius settles, by its wings, and it is 
only at such periods of rest that the full effect of the deceptive 
resemblance can be appreciated ; that part, however, of the first 
abdominal segment of the Vothopews which is visible from the side 
and below is clothed with a golden-grey pubescence, which produces 
the same effect as in the Obereas. 
It is possible that this species of Vothopeus is itself distasteful 
like the mimicked genera Chloridolum and Leontium (see later), 
but I could distinguish no pungent odour like that emitted by 
those genera, and I am inclined to think that its mimetic resem- 
blance is its sole defence. 
I have lately become acquainted with a mimetic species 
belonging to the subfamily Vecydaline (Plate XIX. fig. 12, no. 16 
in Table I.), described in Appendix II. as Psebena brevipennis, and 
I therefore add some details of its habits and of the mode in which 
the mimetic resemblance is attaimed. The species in question 
mimics with a remarkable degree of accuracy one of the common 
red-and-black Braconidee: these Hymenoptera, as already shown, 
serve as models to a considerable number of species of Oberea, 
but in none of these latter is a Hymenopterous appearance so 
admirably borne as in this, a member of a subfamily for the most 
part characterized by a reduction of the elytra. The head and 
prothorax are of an Indian red, the wings are purplish-black, the 
two anterior pairs of legs are testac eous, the long slender poster ior 
pair black with the bases of the femora white: the body is so 
slender that the necessity of producing a wasp- waisted effect by 
means of lateral white patches, as in some of the above-noted Obereas, 
can be dispensed with. 
Most of the life of this beetle, as in all Longicorns with reduced 
elytra, is spent on the wing, when it is simply indistinguishable 
from its model; when it comes to rest the resemblance is still 
remarkably exact, and its quick restless movements and habit of 
flickering the antennz in all directions are very Bracon-like. 
No specimen at all resembling this remarkable species has hitherto 
existed in the British Museum. 
Of the Necydaline, one species Epania singaporensis (Plate 
Proc. Zoot. Soc.—1902, Vou. II. No. XVI. 16 
[13] 
