io 4 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
The pupa varies in length from mm. to 6\ mm., and in the greatest width 
from 3 mm. to 3^ mm. In general appearance it is precisely similar to that of the 
Zululand species, figured on page 27 of the author's Monograph. The tumid lips on 
the last segment, however, are much closer together, the space between them being 
reduced by quite one-half, while the lips themselves are somewhat larger, and covered 
with sparser and therefore more conspicuous granules. The notch between the lips 
is somewhat deeper, and consequently approaches slightly closer to the preceding 
segment than in the species figured in the Monograph. Other points of difference 
are that the edge of each lip bears only two grooves or furrows instead of four, while 
the ridges connecting the lips at the base on the dorsal and ventral side, besides being 
lower owing to the greater depth of the notch, have a broad, shining black margin, 
instead of being almost dull. 
Whatever be the case with regard to the larvae, it would seem probable that, did 
we but know them, all the species of Tsetse-flies might be distinguished in the pupal 
stage by the characters afforded by the last segment. At any rate, in a pupa forwarded 
from Entebbe by Captain Greig with those already referred to, the lips are extremely 
low, much wider apart than in either of the forms previously mentioned, and separated 
by a wide and shallow notch instead of a deep and narrow one. The longitudinal 
grooves with which the connecting ridges are deeply scored at the base are very con- 
spicuous, and the connecting ridges themselves are without a broad and shining black 
margin. This pupa, of which the dimensions are : — length, ~j\ mm., greatest width, 
4 mm., should perhaps be assigned to Glossina paliidipes (Austen), in which case the 
specimen figured in the Monograph would belong to Glossina morsitans (Westw.). 
Distribution of Glossina palpalis 
Since the publication of the author's Monograph, our knowledge of the distribution 
of this species has been considerably extended. As regards Uganda, Bruce, Nabarro, 
and Greig have published 4 a map showing the localities in which the species was 
obtained in the Uganda Province and Usoga. Here the fly is found on the forest- 
lined shore of Lake Victoria and the adjacent islands, passing down the Nile until 
Lake Albert is reached, all round which the species was met with last year by Mr. 
W. Y. Wyndham. In a letter to Dr. Nabarro, dated 'Wadelai, November 2, 1903,' 
Mr. Wyndham states that he has found the fly on all the shores of the Albert Nyanza, 
and also on the Congo side of the Nile, about eight miles to the south of Wadelai. 
He adds that from the results of his investigations ' there is little doubt that the fly is 
prevalent in this part of Africa, wherever the local conditions are favourable.' North 
of Lake Albert Glossina palpalis was encountered at Nimule, in the Nile Province of 
Uganda, by Dr. Brumpt, who also found it to the west of the Nile in the Belgian 
enclave of Lado, and all down the Congo system, from the source of the Welle to the 
mouth of the Congo. Eastwards Dr. Brumpt had previously met with the species on 
