The Shipley collection of scientific papers, Volume 2841922 |
Termos e frases comuns
abdomen animals appear attack Austen Belgian Congo Bequaert big game bionomics bird-lime birds bite blood breeding places brevipalpis bush catching cattle cent colour destruction Diptera distribution district dragonflies dry season effect emerged Eminson enemies Entom entomological experiments feed females Fiske flies fly area fly-belt forest fusca genus Glossina morsitans Glossina palpalis grass hyperparasite infested insects investigations Katanga Lake Victoria large number larvae latter Lloyd longipalpis Macfie males mammals Monkey Bay mosquito Mutilla nagana natives natural Newst Nigeria North Mossurise Northern Rhodesia Nyasaland observed obtained occur pallidipes palpalis parasites parasitised pinned Portuguese East Africa proboscis protection pupa-case pupae pupae of G puparia puparium River Roubaud S. A. Neave Schwetz segment sexes sleeping sickness Southern species of Glossina species of Tsetse-flies specimens Swynnerton Swynnerton 145 tachinoides Tanganyika temperature thorax trees Tropical trypanosomes trypanosomiasis tsetse pupae Tsetse-flies Uganda Westw wing writes Wtst
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Página 155 - At least half a dozen specimens of each sex of a species should, if possible, always be obtained, and a good look-out should be kept for specimens showing any abnormality in structure, coloration, or size. When the collector remains long enough in one spot, he should always endeavour to obtain specimens of a species on different dates. in such a way as to throw as much light as possible on the duration of its seasonal occurrence. Similarly the attempt should be made to illustrate the geographical...
Página 155 - ... two in boiling water, and should then be placed in weak spirit (two-thirds spirit and onethird water) ; after being allowed to remain in this for two or three weeks until thoroughly hardened, they can be transferred to stronger spirit. The larvae of each species must of course be kept separate, and should be put up in a small corked glass tube full of spirit, the necessary particulars, with, if possible, a reference to pinned specimens of the perfect insect, being written in pencil on a scrap...
Página 151 - Take any fairly large glass jar (such as a pickle bottle), with a wide mouth and closely fitting lid, and cover the bottom with a layer of dry plaster of paris to the depth of half an inch ; pour in above this a layer, equal in depth, consisting of powdered cyanide of potassium, mixed with rather more than its bulk of dry plaster of paris ; cover this mixture with a layer of dry plaster of paris to the depth of a quarter of an inch or so, and pour in above the whole a layer, half an inch in depth,...
Página 152 - ... which it cannot escape. The end of the net can then be gathered up in the hand, and the fly forced into a still smaller space, in which it will not be difficult to get it into a pill-box, and then to slip on the lid. If the specimens are small, it is possible with care to get several into one pill-box. Flies may also be transferred direct from the net to the killing-bottle. and so brought home dead ; but this method is not to be recommended, since prolonged exposure to the effects of cyanide...
Página 4 - ... region never having had any worth mentioning. The Glossina Palpalis — its Distribution and Life Conditions in the Island. • The presence of the Glossina palpalis in Principe must be ascribed, so it appears, to a case of importation. According to tradition, this took place in the beginning of last century, at a time when the slave trade and the cattle trade kept alive a frequent movement of shipping between the island and different points on the coast of the Gulf of Guinea, especially the...
Página 2 - ... interrupted on the middle line ; the abdomen, however, is invisible when the insect is at rest, as it is then concealed by the wings. The sexes of Tsetse-flies can readily be distinguished when specimens can be examined, since in the male the external genitalia form a conspicuous knob-like protuberance (hypopygium) beneath the end of the abdomen (see Figs. 12 and 1 3, p. 94), which is absent in the female.
Página 154 - ... envelope is penetrated so slowly by alcohol that, if this be not done, they decompose before the preservative can reach them. It is sufficient to bring them to boiling temperature in a test-tube of water, but for delicate histological work it is better to boil in a mixture of equal parts of 90 per cent. alcohol (ordinary rectified spirit) and aqueous solution of perchloride of mercury, 1 in 500. Even protozoal parasites are well preserved by this method. When fixed, preserve in 90 per cent. alcohol....
Página 13 - ... legs buff, last two joints of hind tarsi clove-brown, front and middle tarsi either entirely pale or, at most, last two joints of front tarsi faintly brownish at the tips, and last joint and distal half of penultimate joint of middle tarsi light brown — never so dark as to form a sharp contrast with the remaining joints.
Página 18 - ... of the thorax exhibiting, in addition to a pair of admedian spots on the suture itself, four sharply defined, dark brown, more or less oval or elongate spots, arranged in a parallelogram, two in front of and two behind the transverse suture.
Página 50 - July 24th, 1906, with reference to Glossina pallidipes as observed and collected by him in the Nile Province, Uganda Protectorate, said : " Of thirteen specimens taken, nine were males and four females. The flies were found near and in a narrow belt of true forest at Kibero, between Nimule and Wadelai, in June, 1906. They were numerous along the native path, in long grass with scattered trees, for a quarter of a mile before reaching the forest. They attacked freely at 8.30...