1 5 o SCIENCE PROGRESS 



life-history of a tick is given, but it is suggested that in a future edition there 

 should be the life-history of a one-host, two-host, and three-host tick set forth. 

 The classification used is based on that of Neumann, and a more recent one, such 

 as that of Nuttall and Warburton, might replace it. Descriptions are given of 

 various members of the genera Ixodes, Amblyomma, Hyalomma, Hasmaphysalis, 

 Dermacentor, and Rhipicephalus. The connection of Hyalomma egyptium with 

 piroplasmosis transmission in cattle in Egypt and the Sudan might have been 

 mentioned, as well as the association of this malady with other ticks. With regard 

 to remarks made in connection with Argas persicus, it has been proved that 

 spirochetosis is transmitted by it, and the granule phase of spirochetes (which are 

 not spirilla) is accepted by the great majority of workers on the subject. Also, 

 Ornithodorus moubata transmits Spirochccta duttoni. 



An interesting account in general terms is given of the mites that cause local 

 maladies known according to the trades affected, as copra itch, grocer's itch, and 

 coolie itch, while there is a good account of Sarcoptes causing itch in man, with a 

 list of the forms that can be transmitted from domestic animals to man. Short 

 accounts of Linguatula and Porocephalus are also given. 



The account of the Insects is introduced by general statements on the struc- 

 ture of insects. Members of the orders Rhynchota, Coleoptera, and Diptera 

 chiefly are parasitic in or on man. The Rhynchota include the lice and bugs. 

 The account of the body lice is somewhat short, considering the importance of 

 these insects in transmitting spirochetosis and typhus fever, neither of which, un- 

 fortunately, is mentioned. Further information regarding the life-cycles of these 

 insects should be incorporated when opportunity arises. 



The part on Insecta has been brought more up-to-date than that on Arach- 

 noidea, and the author is at his best when dealing with the various mosquitoes that 

 may be injurious to man. Rothschild's classification of fleas, with short notes on 

 the same, is given. The part dealing with mosquitoes opens with an interesting 

 general statement regarding their anatomy and biology. The Culicidae are con- 

 sidered at length, including as they do Anophelines that carry malaria, Culex 

 associated with Filaria and Stegomyia transmitting yellow fever. There is a good 

 comparative account of the habitat, larval habits and food of the mosquitoes, with 

 clear diagrams of the parts of the flies, and of the scales found on the adult insects. 

 A detailed table of classification of the Culicidae will be of service to the 

 systematist and to the sanitarian who has to determine mosquitoes that may have 

 disease-producing propensities. A similar table of the species of Stegomyia is 

 given. Various other flies such as Simulium, Chironomids, and owl midges, 

 ncluding Phlebotomus, are described, and then the various Muscide associated 

 with different forms of myiasis are discussed. There is a short note on the 

 cutaneous Oestridae also. 



Good up-to-date accounts of the Tabanidae and Glossine are given, together 

 with a table of species modified from Austen. The section concludes with short 

 notices of other groups of parasitic Diptera and an addendum wherein there is a 

 brief record of some recent work on lice prevention. 



From the foregoing outline, it will be seen that the contents of the volume are 

 comprehensive, covering a wide field. It certainly should be most valuable to the 

 student and should stimulate research into the many problems of parasitology 

 that still need solution. 



