BOOK NOTICES 191 



great use for future investigators. To those who are interested in the 

 faunal aspect of such a work, the author's account of the numerous 

 forms of Salmonidas found in the various Scottish rivers and lochs 

 is of exceptional interest, and, as far as trout are concerned, in- 

 comparably of greater value than anything that has been hitherto 

 made known. The illustrations devoted to this aspect of Mr. 

 Malloch's work are particularly acceptable. Many other subjects 

 are dealt with, such as the age of salmon as indicated by their scales, 

 salmon disease, migration, and histories of a number of "coarse 

 fish " (especially as Scottish species) are treated of. The book is 

 remarkable for the number and beauty of its illustrations, of which 

 there are 239. 



A NATURAL HISTORY OF THE BRITISH LEPIDOPTERA. Vol. X. 

 By J. W. Tutt, F.E.S. London: Swan Sonnenschein Co., 1908- 

 1909. Price \ net. 



With indomitable perseverance Mr. Tutt has completed another 

 volume, the eighth in order of publication, of his exhaustive and 

 masterly treatise on British Lepidoptera. Since only five species 

 are dealt with in this volume, whose history and that of the tribes 

 to which they belong occupies some 358 closely printed pages, it 

 may readily be imagined that little remains to be done in the 

 elucidation of the life-history, variation, and distribution of these 

 attractive insects. Yet in the preface the author modestly states 

 that, hard as he has striven to reach his ideal, he has "in many 

 ways failed signally to do so." Upon examining the result of the 

 author's labours we feel constrained to remark that the ideal aimed 

 at must have been an exceptionally high one, for we are not 

 acquainted with any single entomological work in any language 

 which surpasses that now lying before us in thoroughness of detail 

 and in the amount of conscientious labour which has been bestowed 

 upon it. Planned as it is on the same lines as the previous volumes 

 noticed it is unnecessary for us to describe the form of the book 

 in detail. Part I. contains three chapters which complete the 

 exhaustive account of the " Family Habits in Butterfly Larvae " 

 commenced in a previous volume. The number of plates continues 

 to increase, and we are here presented with no fewer than 53, which 

 are beautifully executed, and which deal mainly with the eggs and 

 larval skin (in the various instars) of the species treated of in the 

 text. These are, Everes argiades, Citpido minimus, Plebeius argus 

 (agon), Cyaniris semiargus, and Agriades thetis (bellargiis). At one 

 time they were all grouped under one generic name {Lye&na), but 

 times have changed, and so have most of the names of British 

 Butterflies ! The scientific study of structure, apart from mere 

 superficial resemblance, and based upon the Butterflies of the whole 

 world, has revealed characters which amply justify the separation of 

 these forms into distinct genera, unfamiliar as these may be to the 



