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3. Family-Oestrida (Bot flies):
a. Genus-Gastrophilus, Leach.
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1. Species Equi, Fabr. (African variety).
The larvae of this species inhabit the stomach of the horse.
A single specimen was received from Navarro, Northern Territories,
14 August, 1907.
Family-Hippoboscidæ :
a.
Genus-Hippobosca, Linn.
Pupipara.
1. Species-Maculata, Leach.
Specimens of this species were taken upon cattle all over Ashanti, and, when in the Northern Territories some years ago, I found the fly widely distributed. Though living in large numbers upon oxen they do not appear to cause the cattle great annoyance. They frequently follow human beings along the roads, perching upon the back, or legs, or endeavouring to get into the hair of the head.
On a couple of occasions flies flew into my bungalow and took refuge in
my hair.
REPORT ON THE GOLD COAST CULICIDE.
From June to the end of December, 1907, a careful search for mosquitoes was made at Obuasi and in its vicinity; in October at Kumasi and in its vicinity.
In both districts large numbers were collected. Some specimens were also collected upon the Cape Coast road. From January to July, 1908, I was at Accra, where plague duties prevented the devotion of much time to the collection of mosquitoes. Such search as was made was confined to my laboratory in the native town and to my bungalow at Victoriaborg.
At my bungalow a special investigation was begun in June and continued the whole month, with the object of ascertaining the species of mosquitoes entering or inhabiting the bungalow.
Each morning search was made and all mosquitoes found upon the walls or windows or in the wardrobes were caught. After dark, mosquitoes seen to enter the sitting or bed room were also secured. It was found that from 30 to 70 mos- quitoes of different species were taken each 24 hours. They were most numerous in the room beneath the bungalow used as a latrine. Here they were found resting upon the whitewashed walls and ceiling all day long. They were most numerous after slight rain. Heavy continued rain caused a diminution in numbers, the explanation being: that all mosquitoes in the bungalow having been captured daily, the places of the captured were taken each night by new individuals from without, and as during heavy rain mosquitoes remain under cover, few entered the bungalow on wet nights.
a.
Myzomyia funesta, Giles.
CULICIDE.
A. Anophelinæ.
Specimens of this species were caught in my bedroom at Obuasi in June. The species is also found at Kumasi. No specimens were seen at Sekondi or at Accra.
B. Pyretophorus costalis, Loew.
Specimens of this species were taken in my bedroom at Obuasi in January and in June. The larva were found at the police barrack in an open drain, the water of which was defiled with urine.
At Obuasi the larvæ of P. costalis failed to increase in size when placed in bottles of clean tank water. Further growth was induced by the addition to the tank water of small quantities of human urine. The proportion of sodium chloride in human urine varies from 05 to 10 per cent. fore, of a small percentage of this salt does not of this species. This result is further enforced
The presence in the water, there- inhibit the development of larvæ by the fact that P. costalis is the
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dominant anopheline at Accra and Sekondi, where all the surface water is slightly brackish.
I have not found larvæ of M. funesta in brackish pools. Apparently, then, the presence of a certain percentage of sodium chloride in the water of a Gold Coast district decides whether the dominant anopheline shall be P. costalis or M. funesta.
The result may be induced indirectly by the action of sodium chloride in inbi- biting or determining the growth of the special alge upon which each species feeds. This requires investigation.
7. Myzorhynchus Strachanii, Theobald.
Specimens of this species were taken in my bungalow at Obuasi and at Accra. In both places the insect was rare and was taken in the daytime and in the month of June.
B. Megarhininæ.
8. Toxorhynchites Marshallii, Theobald.
Specimens were taken upon several occasions upon the flowers of a climbing plant on the edge of the railroad about one mile north of Obuasi, only before 9 a.m., and only in June. A single female was caught in the hospital ward.
Toxorhynchites, sp. nov.
Specimens were taken upon the flowers of the plant mentioned above. C. Culicidæ. a. Mucidus Africanus, Theobald.
Specimens were taken in the bungalow at Accra. The female frequently entered the lighted sitting-room at night in April and June. She is apparently, attracted by artificial light, as no specimens were taken in the unlighted bedroom adjoining.
Mucidus, sp. nov.
Taken in dense bush north of Obuasi, flying over swampy ground in the
daytime, June 12th, 1907.
B. Eretmapodites.
Four new species resembling this genus in many characteristics were taken
outside Obuasi in dense bush.
As the metanotum is ornamented with hairs, I have, however, described my
new species under the sub-family Trichoprosoponine, Theobald.
Eretmapodites Oidipodeios Graham, sp. nov.
Specimens were taken at Obuasi in bush paths from 2 p.m. to 5 p.m. in
August, October, November.
Eretmapodites leucopous, Graham, sp. nov.
Specimens taken at Obuasi in bush, 11 a.m. to 1 p.m., from August to
November.
At Kumasi, in bush, 11 a.m., in October.
E. chrysogaster, Graham, sp. nov.
Specimens taken at Obuasi in bush, 11 a.m. to 6 p.m., from August to
November.
At Kumasi in bush, 11 a.m. to 4 p.m., in October and November.
Reared from larvæ found near Dompoasi in a small collection of water in a
hollow of a tree, 14 August, 1907.
E. melanopous, Graham, sp. nov.
Specimens were taken at Obuasi in bush, 11 a.m. to 3 p.m., in June, July,
August, October, November.
A specimen was caught on the window of the bungalow at Obuasi, at 6
in October.
7. Stegomyia fasciata, Fab.
p.m.,
Specimens were taken in the house at Obuasi in July, August, December.
I