164 



The habits of these worms have been stud-ed, and are described. 

 The presence of mosquito larvae in the vicinity causes some excitement 

 among them, and the larvae are attacked when their siphons are 

 brought to the surface of the water for respiration and the larvae are 

 motionless for a few seconds. The worm applies one of the lateral 

 lobes of its head to the siphon of the larva, to which it adheres by 

 means of the viscous substance with which it is covered ; if the larva 

 tries by means of its mouth-parts to rid itseK of its enemy, as is fre- 

 quently the case, both mouth-parts and siphon adhere to the 

 worm, which, as soon as it has secured its prey, drops with it to the 

 bottom of the receptacle. It then punctures one of the larval segments 

 and drags out the whole body content of the larva, leaving only the 

 head and skin. Adult larvae, on account of their strength, and pupae 

 on account of their activity, can almost always escape the attacks of 

 Planaria. 



The experiments described indicate that this natural enemy might 

 be used artificially for the destruction of mosquito larvae, but further 

 information must be obtained regarding the distribution and habits 

 of the worm, its resistance to meteorological conditions, etc. , before its 

 value in this connection can be determined. The present notes ar 

 given with the object of interesting students in the question and 

 suggesting a field of investigation to them. 



Rentoul (A. V. D.) & Clinton (H. F.). Poultry Parasites.— J/. Bep. 

 Agric. Victoria, Melbourne, xviii, no. 5, May 1920, pp. 302-306, 

 3 figs. 



The external parasites of domestic fowls that are most frequently 

 met with are discussed. The species dealt with include the red mite, 

 Dermanyssus gallinae ; scaly leg mite, Sarcoptes mutans ; the depluming 

 mite, Sarcoptes laevis ; the small body-louse, Menopon pallidum ; the 

 large body-louse, M. biseriatum ; the head-louse, Lipeurus hetero- 

 graphus ; the wing-louse, L. variabilis ; the large turkey-louse, Goniodes 

 stylifer ; and the poultry-tick, Argas persicus [R.A.E., B, vii, 67]. 



PoMEROY (A. W. J.). The Prophylaxis of Malaria in Dar-es-Salaam, 

 East Africa.— J/. R.A.M.C., London, xxxv, no. 1, July 1920, pp. 

 44-68, 1 plan, 2 charts, 4 figs. 



The mosquito control measures undertaken in Dar-es-Saalam 

 are described, and the organisation of the mosquito brigade is dis- 

 cussed, the importance of drainage and control of swamp land being 

 emphasised. 



The species found in 1918-19 included Anopheles funestus, Giles, 

 A. costalis, Lw., A. maculipalpis, Giles, Banksinella lineatopennis, 

 Ludl., Culex fatigans, Wied., G. bitaeniorynchus, Giles, C. consimilis, 

 Newst., C. iigripes, Grp., C. annulioris, Theo., C. invidiosus, Theo., 

 G. duttoni, Theo., G. thalassius, Theo., G. sitiens, Wied., G. aurantapex, 

 Edw., G. laurenti, Newst., G. simpsoni, Theo., Stegomyia Jasciata, F., 

 S. simpsoni, Theo., Eretmopodites quinquevittatus, Theo., Toxorhynchites 

 brevipaljnSjTheo., Mansonioides uniformis,Th.eo., Gulicio^nyia nebulosa, 

 Theo., Ochlerotatus pembaensis, Theo., 0. albocephalus, Theo., Harpa- 

 gomyia taeniorostris, Theo., and Uranotaenia mashonaensis, Theo. 



