426 
EGYPT 
with at Tawila and near Mogran respectively. N. teretiuscula, Phil., 
var. litliopliaga , Zieg., was fairly abundant, occurring at Hillet Abbas, 
Fachi Shoya, Tawila, and near Mogran. Specimens of a species 
resembling the last but higher in proportion to the width and less 
attenuated posteriorly were taken at Tawila, Ad Duwem, and near 
Mogran, these last were greenish and not so dark in colour as the 
others, which were nearly black. 
Seven examples of Mutela nilotica, Fer., var. angustata, Sow., 
were found near Mogran. The largest has a width of 120 mm., 
height at the umbo 42 mm., greatest height 48 mm. There were also 
met with here three immature individuals of the var. elongata , Sow., 
agreeing with Germain’s figure of M. moineti , Bourg. Eight speci¬ 
mens of Mutelina rostrata, Rang., were taken at the same locality. 
A recently killed example of Spatha rubens, Lam., var. cailliaudi, 
von Martens, was obtained from a fishing boat at Kosti, as well as a 
single valve of a larger specimen. At Fachi Shoya I found the right 
valve of a species which seems to agree with Spatha marnoi, Jickeli. 
Three fine specimens of Aetheria elliptica, Lam., of the typical 
form, were taken at Tawila. They were adhering to one another and 
contained the animals, they are devoid of tubular spines and are 
more or less oval in contour. A valve with the broken hinge of the 
other attached, similar to the preceding, was found at Gebel En. At 
Fachi Shoya I met with a smooth valve fixed to two spiny ones 
(var. tubifera, Sow.). This large bivalve is so like the common 
Oyster that one was astonished to find it in a river at such a great 
distance from the sea. Like the Oyster it is not only variable but 
extremely irregular in form; it is gregarious, occasionally forming, 
we were told, such rocky masses as to be an impediment to navigation. 
I am greatly indebted to Mr. Edgar Smith for help in comparing 
my specimens with those in the Natural History Museum. The 
works of M. Pallary have been of considerable service, and I have 
in the main followed his classification. 
EGYPT. 
February 24th—April 18th, 1909. 
The return voyage down the Nile was a come-down in other senses, 
and it was difficult to keep up much entomological enthusiasm. 
Moreover, as I began to despair of finding insects of much interest, 
the marvellous history of the country as depicted in tomb and temple 
