169 



through December till the autumn, though where sheep are clean after 

 shearing, January and February may be periods of immunity. In 

 Australia, where wool-blowing has greatly increased of recent years, 

 clean wool is now often infested. 



The chief remedial measures have been crutching, arsenical dips, 

 and shearing of lambs. The control experiments described here as 

 carried out in Australia have already been noticed [R.A.E.,B, vii, 114]. 

 Destruction of the carcases of animals, in which the flies normally 

 breed, by burning or burying is important. The utility of parasites 

 as a means of control is" uncertain. No definite results have been 

 obtained from the introduction from Australia of Chalcis caUiphorae. 



Ferguson (E. W.). New Australian Tabanidae, with Notes on pre- 

 viously described Species.— Proc. R. Soc. Victoria, Melbourne, 

 N.S., xxxiii, 1921, separate, 29 pp., 2 plates, 3 figs. 

 The new species described are : — PelecorJiynchiis flavipennis ; 



Erephopsis delandi, found biting horses ; E. subcontigua ; E. rufonigcr ; 



E. xanthopilis ; Parasilvius fulvus, gen. et sp. n. ; Ectenopsis {?) 



victoriensis ; Silvius sulcifrons ; 5. nigroapicalis ; Tabanus latifrons ; 



T. tasmanictis ; T. bassii ; T. dixoni and T. dienianensis. 



Bruks (C. T.). Insects and Human Welfare. An Account o£ the More 

 Important Relations of Insects to the Health of Man, to Agriculture, 



and to Fovestry.— CcDHbridge, Mass., Harvard Univ. Press; and 

 London, Humphrey Milford, 1920, xii + 104 pp., 42 figs. Price 

 $2.50. [Received "27th September 1921.] 



This volume presents some of the principles and practices of applied 

 entomology in a form illustrative of the biological relationships of 

 insects to their environment ; but few of the details to be found in 

 various other, larger, and more or less encyclopaedic treatises are 

 included, and matters not directly necessary for a brief consideration 

 of insects as they effect human welfare are avoided. 



Our present knowledge regarding the insect dissemination of such 

 diseases as malaria, vellow fever, sleeping sickness, typhus, trench 

 fever and bubonic plague is summarised in a chapter on " Insects and 

 the Public Health," and several of the insects concerned, as well as 

 others, receive attention in one devoted to " Household Insects." 



The biological method of reducing the numbers of noxious insects 

 offers, at present, the most promising field in which to speculate con- 

 cerning the future development of entomological practice, to which 

 the concluding chapter is devoted. 



IsMERT (R.). Les Maladies du Sang : Les Piroplasmoses.— A'a'. Agric. 



Afr. Nord, Algiers, xix, no. 105, 5th August 1921, pp. 612-613. 



A general account is given of piroplasmosis and of its economic 

 importance, especially in the plains, where it causes the death of many 

 animals. In a later paper, the modes of infection and the exact role 

 of ticks in the transmission of the disease will be discussed. 



Sergent (Et. & Ed.). Etude Experimentale du Paludisme.— .4;t/2. 



Inst. Pasteur Afr. Nord, Algiers, i, no. 1, March 1921, pp. 1-32. 

 [Received 8th August 1921.] 

 In the course of this description of the effect of quinine and other 

 drugs on Plasmodium relictum, which is the causal agent of malaria 



