io6 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
' At Lcopoldville we employed a brigade of beys, to whom we supplied nets and bottles. On wet or 
dull days their total catch was often not more than a dozen or so between them ; but on other days from 
December to May they brought in regularly twenty or thirty each, the boys being paid according to the 
number each caught. The low-lying forest and scrub by the banks of the river was the best hunting 
ground. During the last week in January, by the kindness of the State authorities, who placed a steamer 
at our disposal, Dr. Dutton and my self were enabled to make an exploratory tour of the islands in Stanley 
Pool. On the large forest-covered island of Bamou, where I spent two consecutive days hunting, Glossina 
palpalis were literally in myriads, and for the whole two days my hands, face, and neck were bitten un- 
mercifully, seldom less than ten or a dozen flies attacking at the same time whenever I remained within one 
hundred yards of the abrupt edge of the forest. Surrounding this forest are areas of marsh many miles in 
extent, where patches of solid ground are few, and where not a Tsetse is to be found. In the dark, cool 
interior of the forest the Tsetse, although not nearly so numerous or so bloodthirsty as at the margin, were 
still a pest. On one occasion I counted thirty-eight probing the bod}' of a large monitor {Varanus niloticus) 
that I had shot only a few minutes before. In the blood of this animal were numbers of Drepanidia sp. 
(? nop.), but no trvpanosomes. 
' On this island the question again rose : — " Has the buffalo any connexion with the Tsetse" ? There 
were many small herds which passed backwards and forwards between the forest and the marsh, spending, 
however, most of their time in the marsh. One occurrence, namely, the fact that I came upon a herd pf 
buffalo resting during the hottest part of the day, actually at the extreme edge of the forest, where, as I 
have said, the flies were, and always are in my experience, the most numerous and tormenting, tends 
to show that the skin of the buffalo, which is enormously thick, is too much for the Tsetse. 
' Speaking from personal experience alone, the initial stab of Glossina palpalis is very painful, but no 
subsequent irritation follows. At the seat of the bite there soon appears a hard nodule, which may remain 
for many days, but is unaccompanied by any marked swelling or discoloration. 
' I may add that at the end of April, I again visited Bamou Island, and was surprised on that occasion 
to find that Glossina palpalis was conspicuous by its almost total absence, hardly a fly being encountered, 
while the few that were seen appeared to have little inclination to bite. I have long suspected that this fly 
only sucks blood during certain months in the year.' 
Glossina pallicera (Bigot). 
There is nothing to add to the account of this species given in the Monograph, 
and no further specimens have been received. The typical specimen, and a second one 
referred to oh page 80 of the Monograph, have been kindly presented to the British 
Museum by Mr. G. H. Verrall. 
Glossina morsitans (Westw.) 
From a gravid female of this species taken near Yola, Northern Nigera, on 
October 10, 1903, by Mr. W. F. Gowers, 1 have extracted an immature larva 
measuring 4 mm. in length by if mm. in greatest width. It is of the normal type, 
and the tumid lips on the last segment, which in this specimen are only slightly 
brownish in colour, are separated by a narrow notch but almost meet together at their 
margins, which appear to be marked by only two grooves. 
