ie) 
does the same, in mimicry, I believe, of the Aculeate 
model. 
“The Pepsis is also mimicked by a Reduviid bug and a 
Locustid of which I send specimens. The likeness is not at 
all striking when the insects are at rest, but both of them have 
the very curious habit of flying and running alternately and of 
running short distances with expanded wings.* The Scaphura 
when active directs its antennae forward, but these organs 
sweep backward in the resting position, in which the insect ap- 
pears to be non-mimetic. I was somewhat surprised to see that 
the Pepsis does not attack its mimics. Many of the American 
Fossorial wasps hunt the Orthoptera, but not this kind.” 
Prof. Poutron said that in view of Dr. Seitz’s last sentence, 
it was interesting to find that H. W. Bates, in his epoch- 
making memoir (Trans. Linn. Soc., xxiii, 1862, p. 509) had 
spoken of these very Locustidae as the prey of their models :— 
““ Amongst the living objects mimicked by insects are the 
predaceous species from which it is the interest of the mimickers 
to be concealed. Thus, the species of Scaphura (a genus of 
Crickets) in South America resemble in a wonderful manner 
different Sand Wasps of large size, which are constantly on 
the search for Crickets to provision their nests with. Another 
pretty Cricket, which I observed, was a good imitation of a 
Tiger Beetle, and was always found on trees frequented by 
the Beetles (Odontocheilae). There are endless instances of 
predaceous insects being disguised by having similar shapes 
and colours to those of their prey; many Spiders are thus 
endowed: but some hunting Spiders mimic flower-buds, and 
station themselves motionless in the axils of leaves and other 
parts of plants to wait for their victims.” 
Prof. Poutron questioned the interpretation of mimetic 
resemblance given by Bates in the paragraph quoted above, 
although he did not doubt the anticryptic significance of 
the flower-haunting spiders. He had argued, in Trans. Ent. 
Soc., 1904, pp. 661-5, that the mimicry of their Hymenopterous 
prey by certain Asilid flies, and of Bombus by the Volucellas 
which lay eggs in their nests, is not to be explained in the 
* This description was illustrated by a sketch of the two mimics, 
made from memory by Dr. Seitz, and fixed beside the specimens. 
