19 



The present bibliography, the first on the subject hitherto issued, 

 enumerating 639 publications, includes comments by the author, and a 

 system of key-lettering whereby the contents of the pubhcations is 

 indicated. It is published in advance of the author's papers on 

 Pcdiculus (1) so as to avoid repeating references to the literature which 

 will be fully treated in the parts that follow, and (2) to help other 

 investigators. 



NuTTALL (G. H. F.). The Part Played by Pediculus humanus in the 

 Causation of Disease. — Parasitology, Cambridge, x, no. 1, 29th 

 November 1917, pp. 43-79, 1 plate. 



A critical summary of what is known regarding disease-transmission 

 by hce, and an account of their pathological effects. The louse's 

 saUvary glands contain anti-coagulins. A mass of information is 

 brought together in this paper for the first time. 



NuTTALL (Gr. H. F.). The Biology of Pediculus humanus. —Parasitology, 

 Cambridge, x, no. 1, 29th November 1917, pp. 80-185, 2 plates, 

 2 text-figs. 



An exhaustive account of the biology of the louse, incorporating 

 the work of other writers and that of the author. The subject matter 

 is divided into three parts dealing with (1) the prevalence and modes 

 of dissemination of lice, (2) methods of study and (3) special biology. 

 The index to the contents covers two pages. 



HowLETT (F. M.). Notes on Head and Body-Lice and upon Tempera- 

 ture Reactions of Lice and Mosquitoes. — Parasitology, Cambridge, 

 X, no. 1, 29th November 1917, pp. 186-188. 



Experimental observations made in India and bearing out what is 

 stated in the foregoing publications by Nuttall : that head-lice may 

 acquire body-louse habits and appearances, and that they react to 

 a source of warmth. Culex fatigans, unlike the other species 

 experimented upon, does not react to a source of warmth. 



March AND (W.). Notes on the Early Stages of Chrysops (Diptera, 

 Tabanidae). — Jl. New York Entom. Soc, Lancaster, Pa., xxv, no. 3, 

 September 1917, pp. 149-163, 3 plates. 



The egg-laying instinct of Chrysops callidus is apparently determined 

 by two factors, the presence of water, and of plants growing above its 

 surface. The eggs are laid in the morning hours from the latter part 

 of May till the end of July, forming a cohesive cluster on the under-side 

 of leaves, at a height of from 6 inches to 2 feet above the surface of the 

 water. The habit of laying in the morning differentiates this species 

 sharply from the others observed, which oviposit in the late afternoon. 

 The egg-cluster is protected by a shining outer membrane, which seems 

 to be a secretion of the eggs themselves, and each cluster may contain 

 250-300 eggs. The act of oviposition, which entails a long preparation 

 in choice of a suitable place, occupies about three-quarters of an hour, 



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