1902.] SPIDERS FROM BORNEO AND SINGAPORE. 263 
wings resplendent with metallic blue sheen, occurs commonly on 
the mountains near Kuching. On . Mt. Santubong a fly was 
recently captured affording a close resemblance to the wasp. 
The body and legs are exactly of the same shade of colour as are 
those of the wasp; the wings, though somewhat browner, are 
more opaque and possess a ‘blue metoliie sheen sufficiently 
deceptive. Their size is large (larger than the fore wing alone of 
the wasp), and it is inter esting to note the same downward curve 
of the submedian vein as was found in Hyperechia fera, suggesting 
the line of junction between a fore and a hind wing. The 
antenne are fairly long, though far shorter than those of the 
wasp. I have not seen “this species in the living state, but even 
as a cabinet specimen it is a remarkable case of deceptive resem- 
blance (compare figs. 11 & 12, Plate XXIT.). 
Specimens of this fly from the Philippines and Tenasserim are 
in the British Museum collection of Diptera. 
Mimic. Physocephala sp. (Fam. Conopide.) 
Model. J/schnogaster micans (Sauss.). 
This example has been selected at hazard from a large number 
of similar thin-waisted flies, chiefly Syrphidee and Conopide, as 
typical of the method by which the simil: arly built Humenide and 
Vespide are mimicked. The first abdominal segment. is much 
attenuated and drawn out, those following are thickened; the 
transparent wings are shaded with fuscous on their anterior 
borders, in accordance with a similar arrangement in the wasp ; 
the head is the only part which exhibits any of the yellow 
colouring of the model. 
vi. Mimic. Gen. et sp.? (Fam. Stratiomyide, subfam. Raphio- 
cerine.) Plate XXII. fig. 6. 
Model. JWesostenus sp. near pictus (Smith). Plate XXII. fig. 5. 
Both species were taken on Mt. Penrissen on the same day, 
and the similarity of their external appearance was equalled by 
the similarity of their method of flight and action when at rest. 
The Ichneumon-fly was common enough, and was frequently seen 
to hover over a plant for a few minutes, then suddenly drop 
down and pitch on to a leaf, over which it would walk, moving its 
white-banded antennee up and down with a quic ik flickering 
movement. The fly, of which only one specimen was caught, 
behaved in exactly the same manner; it would hover, then 
suddenly settle and walk over a leaf on its mid and hind pairs of 
legs, waving rapidly up and down its long front legs, the tibiee of 
which being black and the tarsi white, most closely resembled 
the antenne of the Ichneumon-fly. The femora were kept more 
or less pressed against the ventral surface of the head, so that the 
sham antenne seemed actually to arise from the correct position. 
This method of bringing about a resemblance to long antennz is 
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