446 Mr. C. O. wang erwents Fwe Years’ Observations 
dectes,—1 9. The “absolutely guaranteed mendicants”’ 
referred to above were received July 18, 1918. In mount- 
ing the specimens these “ mendicants’’ were kept dis- 
tinct from the “haunting flies”—J. farquharsoni, but 
the relationship to the notes was inadvertently lost, so 
that at first it was impossible to determine which group 
was “haunting” and which “ mendicant.” They were 
all carefully labelled (1) and (2) and sent to Mr. Collin, 
who found in (2) two of the “ mendicant”’ species sent 
before, while (1) contained only the 5 9 of the hitherto 
unseen species WM. farquharsont. It was therefore certain 
that the latter are the “ haunting flies.” Group (2) of 
“absolutely guaranteed mendicants” contained Milichia 
prosaetes,—4 9; M. dectes,—2 3, 3 Q, all captured, evidently 
in May, 1918, on Cremastogaster ant-trees. 
The following extracts show that there are still other, 
probably undescribed, species of Milichidae to be found 
associated with Cvemastogaster in S. Nigeria, together 
with an ‘“ ant-mimic”’ which cannot be placed with cer- 
tainty. Mr. Collin wrote, April 17, 1921: “When one 
remembers that Farquharson found a Cecidomyid and an 
Ephydrid under circumstances and with habits so com- 
pletely different from what one would expect in a member 
of either family, one hesitates to offer an opinion on the 
identity of the other small fly whose habits he describes.”’ | 
April 28, 1918.—I am to look more carefully into the 
mendicant flies, There are at least two others that share 
Coccid secretions with the ants, one with the underside 
of the abdomen a silvery white. They are all associated 
with the same ants, and I may have sent them by accident 
mixed with the mendicants. However, I'll get more and so 
clear up the point. . I should say they all belong to closely 
related genera. I saw the mendicants busy this forenoon. 
Aug. 11, 1918.—At the same time [viz. when observing 
the Cecidomyids] I found some of the little “* proctophila ” 
besides another small fly that appears to be an ant-mimic 
(in spite of its wings). It wanders about among the ants 
keeping its wings in motion all the while in the manner of 
Ortalid flies when they settle, and appears to feed on 
undefined matter on the somewhat moist surface of the 
hollow tree. They settle among the ants and dodge about 
with extraordinary freedom. 
Aug. 25, 1918.—When I was studying the Cecidomyids 
to-day I collected some of the mimetic flies of which I 
told you. They simply dodge amongst the ants and lick 
