MATHEBAN 
393 
from the figures [Plate IV., Figs. 7, 8], this Fly is a quite extraordi¬ 
nary mimic of the Wasp, Eumenes flavopicta [Plate IV., Figs. 9, 10]. 
It is a well-known rule in cases of Batesian mimicry that the mimic 
is scarcer than the model. This seems to be borne out by three 
closely allied black and yellow Ceria. From a single specimen, a 
male taken at Darjiling, de Meijere described C. trinotata ; of another 
as yet undescribed species, the British Museum has a single specimen 
from Assam, while 1 took but three of my species, 1 so that presum¬ 
ably all are scarce. 
It scarcely seems likely that Tabanus albimedius, Walk., was 
really attracted by water, though taken close to it, but several 
specimens of a species of Ochromyia were captured about foul mud 
at the head of Charlotte Lake; the long-winged Bombyliid, Exo- 
prosopa sp., was taken about water, but not the allied Argyramoeba 
distigma, Wied. 
In Charlotte Lake itself I took half a dozen specimens of 
Hydaticus sp., one Cybister asiaticum , Sharp, and one of another 
species of the same genus. On the top of the water there were 
Whirligigs in abundance, viz., Dineutes indicus, Aube, and a species 
of Orectochilus. A Heterotarsus invited capture by walking over my 
store-boxes. 
It was both hot and cold at Matheran: it would rise to 80°-84° 
or even 86° at midday, and the sun penetrated the corrugated iron 
roof of the hotel, which was very imperfectly protected by straw 
outside, yet in the morning it might fall as low as 71°. Moreover 
in the afternoon a high wind would sometimes rise suddenly, and 
one would shiver when the temperature fell to 73°. This is no 
laughing matter, and I got such a severe chill that I had to call in 
the services of the Civil Surgeon, Captain Superintendent McPher¬ 
son, as well as make use of my bearer’s talent as a masseur. 
1 Mr. Austen informs me that the name Ceria is preoccupied in another Order, 
but that there is an old name Cerioides , formerly belonging to the genus which 
should be reinstated. The latter name seems somewhat unfortunate. 
