PREFACE. XX111 



Families of Insects, it would not have been undertaken. In 

 attaching names to such species as appeared undescribed, 

 I have in most cases preferred deriving them from that of 

 the genus or species of quadruped or bird upon which they 

 are parasites, which affords a certain degree of information 

 when looking over the synopsis for the purpose of ascer- 

 taining a particular species. 



In conclusion, the Author feels that his gratitude is due 

 for the interest taken in his labours by so many kind 

 friends, whose assistance in forwarding specimens from 

 various parts of the kingdom he begs publicly to acknow- 

 ledge. Amongst these he is especially indebted to the 

 Rev. Leonard Jenyns, A.M., of Swaffham Bulbeck, in 

 Cambridgeshire ; William Thompson, Esq., of Belfast (both 

 of whose entire collections were placed in his hands) ; 

 William M. Tweedy, Esq., of Truro ; Sir William Jardine, 

 Bart,, of Jardine Hall, Dumfriesshire ; Prideaux John Selby, 

 Esq., of Twizell House, Northumberland; T. C. Heysham, 

 Esq., of Carlisle; Professor Burmeister, of the University 

 of Halle ; William Wallace, Esq., of Douglass, Isle of 

 Man; Dr. Southby, of Amesbury, Wiltshire; Wm. Mil- 

 ner, Esq., of Rochdale ; Henry Doubleday, Esq., of 

 Epping; Rev. William Little, of Kirkpatrick, juxta Mof- 

 fat, Dumfriesshire ; Mr. Abraham Clapham, of Potter 

 Newton; Mr. Calvert, of Leeds; and Mr. G. R. Denny, 

 of Norwich. To two of the above friends the Author is 

 under obligation for assistance of another kind. From the 

 great increase in the number of species above what was 

 calculated upon when this Monograph was commenced, 

 although it enabled him to render a greater service to 

 science, at the same time placed such a barrier in the way, 

 as to preclude the publication of the work at the original 

 price announced in the prospectus ; for, independent of the 

 work paying its expenses, which is the least remuneration 

 an Author is entitled to look for, it threatened a serious 



