43 



as the toxic stage is reached or passed, the aninidl dies. The poison^ 

 the eggs in. the cocoons, the eggs in the abdomen of females, and young 

 spiders recently hatched, all produced venomous haemolytic extracts 

 of decreasing strength in the order mentioned. The best treatment is 

 permanganate of potash applied both externally and internally, 

 and, if used promptly and correctly, this is a certain cure. 



ScHWETZ (J.). Recherches sur les Glossines. — Ecole Med. Trop.y 

 Brussels, 1919, 150 pp., 4 maps, 5 figs. [Received 30th 

 December 1919.] 



The majority of the papers incorporated into this volume have 

 previously been noticed [R.A.E., B, iv, 30, 31, 43 ; vi, 39, 144 ; vii, 80, 

 135]. Later observations are recorded on the habits of Glossinor 

 brevi'palpis, G. fusca, G. pallidipes, G. palpalis, and G. morsitans, 

 and a map shows the geographical distribution of these species in the 

 north Katanga district of the Belgian Congo. 



The habits of G. fusca vary considerably at different periods of the 

 year. This species, in general with all other species of Glossina, 

 diminishes in numbers in the dry season, especially during the bush 

 fires. This decrease, being due to lack of shade and moisture, is less 

 noticeable in dense vegetation near water, but in districts where no 

 shade remains after the falling of the leaves the files may disappear 

 entii-ely, though temporarily. 



Even under the most adverse conditions the flies succeed in escaping 

 destruction, frequently by migration, or owing to the existence of sites 

 favourable to the pupae. 



The result of six years' work on the habits of tsetse-fiies have been 

 entirely negative from a practical medico-prophylactic standpoint. 

 Any proposals for the destruction of adult flies seem futile in view of 

 their seasonal migration ; a more promising possibility would be the 

 discovery of an efficacious method of destroying the pupae. This, 

 however, presents many difficulties, now that it is known that the 

 pupae are not necessarily found in certain well-defined spots, but 

 that they occur in the most varied locations and frequently far from 

 their preferred habitat. Even G. palpalis, which breeds for preference 

 beside water, will withdraw for 100 yards or more if the immediate 

 vicinity of the water is not suitable for one reason or another. The 

 subject, however, is not yet exhausted and calls for further research. 



The discovery of G. tabaniformis, Westw., in the north of the pro- 

 vince of Katanga is recorded. 



Fletchee (T. B.). & OTHERS. Second Hundred Notes on Indian Insects. 

 — Agric. Research Inst., Pasa, Bull. 89, 1919, 102 pp., 58 figs. 

 [Received 30th December 1919.] 



The occurrence of the mosquitos, Ochlerotati'S oreopMlas, Culex 

 nilgiricHS and C. mimelicus, in India here recorded has been noticed 

 elsewhere [R.A.E., B. iv, 64], as has also the information given with 

 regard to the lif e-historv and habits of the eye ^y, Siphunculina (Sipho- ^ 

 nella) Janicola, De Meij'. \R.A.E„ B., vi, 22]. ^^-^ /\ 



