MOLLUSCA OF THE SUDAN 
423 
or six years ago, and you have certainly got much more material than 
they did—though, strange to say, hardly any of the same species ! ” 
February 22nd.—On my return journey, at Atbara Junction (lat. 
17° 35' N.), I took a male of Rhynchium niloticum, a red and black 
Wasp whose acquaintance I had made at Khartum. 
At Abu Hamed (lat. 19° 30' N.) I made a raid upon the station- 
master’s garden and picked up a female Philanthus variegatus , a 
common Khartum insect which I did not meet with north of this, 
although I am told that it is a North African species; also two females 
of Nomia latijpes , Moraw., a Bee that I did not come across else¬ 
where ; and a female of N. edentata. A Dragon-fly and a Grasshopper 
are still unnamed. 
February 23rd.—The common Ruxoa spini/era came to light at 
Wadi Haifa. 1 
NOTE ON THE LAND AND FRESHWATER MOLLUSCA OF 
THE SUDAN. 
By Mrs. G. B. Longstaff. 
The dearth of land Mollusca in Egypt and the Sudan offers a 
marked contrast to their abundance in Jamaica. This is to a certain 
extent atoned for by the numbers of freshwater Mollusca occur¬ 
ring in the Nile, numbers, however, of individuals rather than of 
species, for many species range with but slight variation over con¬ 
siderable distances. Possibly, indeed, if individuals from districts 
still more remote could all be brought together, it might be found 
that some now regarded as distinct species would prove to be but 
several links in a chain of the varieties of one form. 
The Mollusca here recorded were collected at the mouth of the 
White Nile near Mogran, as well as at various ipoints where the 
steamer stopped during a five days’ trip from Khartum to Gebel En 
and back. The month of February seemed a most favourable time, 
since the river was subsiding and many specimens were found at its 
margins either alive or quite recently deceased. The only land shell 
taken was Limicolaria flammea, Mull. The largest specimen, which 
is of the variety sennaariensis, Parreyss, was found by the obliging 
manager of the steamer, Mr. Macdonald, on a hill at Gebel En. It 
agrees very nearly with Fig. 5 on PI. vi. of “ Fauna der Land und 
Siisswasser Mollusken Nord-Ost-Afrika,” by C. F. Jickeli. Three 
shorter shells were met with which greatly resemble the var. 
1 This account of the Sudan appeared in the Entom. Month. Mag. 
