which the above drawings have appeared. From them, as from the 

 authors, we have met with uniform courtesy. The Director-General 

 of the Indian Medical Service, on behalf of the Government of India, 

 has permitted us to use the figures on Plates VI, VII, IX, X and 

 XII, which have appeared in Memoirs by the junior author, and has 

 added further to our indebtedness by allowing us to use the blocks. 

 Mr. Hathaway, the publisher of Williston's North American Diptera, 

 has permitted us the use of the two figures illustrating chaetotaxy, 

 and has assured us that the author would have had no objection 

 had it been possible to communicate with him. The publishers of 

 the Arbeiten aus dem Kaiserlichen Gesundheitsamte have allowed us to 

 reproduce the figure of the proventriculus of Culex by Schaudinn, the 

 authorities of the Smithsonian Institution the figure of the Muscoidean 

 head by Townsend, and the publishers of the American Naturalist 

 the figure of Comstock and Needham's ' urotype '. We are indebted 

 to the Entomological Society of London for permission to reproduce 

 the figure of the divisions of the Dipterous thorax by Professor Mik, 

 which appeared in their Transactions. 



All the line drawings of bugs, lice, ticks and acari and all the brush 

 drawings with the exception of those on Plate XXVI and those of 

 Haematopota pluvialis, Anopheles costalis and Anopheles funestus, and 

 some of the line drawings illustrating the anatomy of ticks, are by 

 Mrs. Patton. The extent of our indebtedness to her is difficult to 

 express. Any value the book may have is very largely due to her skill 

 and to the unremitting care which she lavished on the work. In 

 several instances details of structure and marking, not previously noted, 

 have been picked out and drawn by her. The remaining drawings 

 are the work of the junior author. 



For the preparation of many of the drawings and descriptions it 

 has been necessary to obtain specimens of forms not present in our 

 neighbourhood, and it gives us great pleasure to be able to return 

 thanks to those who have so courteously complied with our requests. 

 We are indebted to Dr. Annandale for a large collection of named 

 Diptera; to Professor Bezzi for a large collection of Muscids, includ- 

 ing Haematobia and Haematobosca ; to Dr. Anton Breinl for a 

 collection of Culicidae and Muscidae from Australia ; to Mr. Nathan 

 Banks and Dr. C. Wardell Stiles for several species of American ticks ; 

 to Dr. Fantham and Mr. Wigham for specimens of Ornithodorus 

 moubata; to Professor Oswaldo Cruz for specimens of Conorhinus 

 megistus-, to Mr. Hadwen for a collection of ticks from Canada; to 



