Co) 
attention. The sound is very curious, and I have rarely 
detected the fly by any other means. When one attempts 
to catch it the fly retreats more deeply into the hole, so I find 
it difficult to understand how the Asilid can seize it. 
““ Seeing your collection of Aszlzdae and their prey I formed 
the intention of obtaining a set of insects captured by this 
Asilid, and I hope on my return to Algeria in June to be able 
to send you a good series of them.” 
Prof. Poutron said that the latter observation doubtless 
bore upon the fact that the larvae of Oncodidae are parasitic 
upon spiders. It was interesting to learn that this Algerian 
Asilid drew the line at the Zygaenidae and a Mylabrid; for 
certain other species are known to attack the most specially 
protected insects. It was clear that each species must be 
studied separately and that a very large body of evidence 
was required. 
A LocustiIp AND A REDUVIID MIMIC oF A Fossor1aL Acu- 
LEATE IN THE 8. PAULO DISTRICT OF BRaziL.—Prof. PouLToN 
exhibited on behalf of Dr. ApatBert Serrz, F.E.S., the Fos- 
sorial model Pepsis sapphirus, Pal. de Beauv., and two of 
its mimics—the Reduvid bug Spiniger ater, Lep. and Serv., 
and the Locustid (Phasgoneurid) Scaphura mgra, Thunb., var. 
vigorsii, Kirb. All three had been captured, together with a 
third mimic, a Syntomid moth of the genus Macrocneme, 
by Dr. Seitz, along not more than 200 paces of a sunny road 
through the high forest between Santos and the little village 
of Sad Vicente, about the year 1888, although Dr. Seitz believed 
that he had seen all three insects upon the wing in every 
month in the year. He had written, May 4, 1913, with 
additional details in a later letter: ‘‘ At this spot the Fossor, 
a species of Pepsis, is very common. It appears on the wing 
about 10 a.m., and flies slowly up and down the road. At 
this time of day large spiders may often be seen crossing the 
road, and, in a moment, they will be captured by the Fossorial 
wasps. The Fossor is a very powerful insect, stinging very 
badly, and it is the model of several different insects. Among 
the mimics are Syntomid moths of the genus Macrocneme. 
The Fossor, when on the wing, carries its legs hanging down 
like our Psammophila; and I observed that the Macrocneme 
