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manner suggested by Bates or still earlier by Kirby and Spence, 
and followed in 1890 by the speaker himself (“ Colours of 
Animals,”’ p. 267). All such examples were better interpreted 
as a protection from enemies that feared the stinging Hymeno- 
ptera. The particular models were peculiarly advantageous 
because of the special association between them and their 
mimics. If the Scaphuras mimicked their Fossorial foes 
the resemblance was probably to be explained in the same 
way, and not as a means of escaping the attacks of their 
models. In the meantime Dr. Seitz’s observations showed 
that these Locustidae may mimic Fossors which attack other 
prey. 
The resemblance of the thickened basal segments of the 
Locustid’s antennae to the entire organ of the model was 
found throughout the genus Scaphura, which was probably 
mimetic in all its species. The sudden thinning away to the 
diameter of the usual hair-like Locustid antenna as well as the 
appearance of a yellow “tip” at the end of the thick basal 
section—about one-third of the whole organ in length—was very 
striking. There was also a peculiar quality about the annula- 
tion of the basal part which strongly suggested the antennae 
of the Fossor. The example afforded a most instructive com- 
parison with the mimetic likeness of certain Longicorn beetles 
to weevils and Phytophaga, as described by Mr. C. J. Gahan. 
In these cases, which he had quoted in Linn. Soc. Journ. 
Zool., xxvi, 1898, p. 596, the terminal part of the too-long 
antennae of the mimic’ was concealed by a hair-like fineness, 
while a false “ tip” was indicated by a special dilatation (in 
Doliops) or by hairs (in Estigmenida). 
The antennae of the Pepsis sent by Dr. Seitz were entirely 
yellow and not black with yellow tips like those suggested by 
both Reduviid and Locustid mimics. The fine series of Pepsis 
sapphirus in the British Museum, kindly shown to him by 
Mr. G. Meade-Waldo, included specimens from localities 
widely distributed over the whole Neotropical Region, and in 
these the antennae were very variable in colour, being more 
often black than yellow. Concerning the varieties in the 
Santos district Dr. Seitz had written: ‘‘ This Fossor, so far 
as I remember, always has yellow tips to its antennae at 
