932. THE ENTOMOLOGIST S RECORD. 
ance of Vol. II will be a matter of general congratulation amongst 
naturalists. 
Mr. Tutt’s work aims at being in the first place a complete collec- 
tion of all that is as yet known of the natural history of the species dealt 
with. These books are no mere compilation, but in the fullest sense 
original treatises. No pains have been spared to get together every- 
thine that relates to the structure, distribution, variation, life-history 
and habits of each form in its several stages. Many of the facts thus 
given are new, a large part being the results of the author's own 
direct observation. Moreover, much of the information here published 
has been communicated privately to Mr. Tutt by his numerous 
correspondents, and the mass of facts given at first hand is thus 
ereatly increased. This is especially the case in regard to the life- 
histories, which in very many instances have been worked through in 
minute detail by Mr. Tutt and his coadjutors expressly for this book. 
Owing to the wide appeal which the author has made to ling 
entomologists for such personal records, and to his laborious researches 
into the literature already printed, the books probably represent the 
sum of existing knowledge on the subjects contained. 
Tt is a special charm of Mr. Tutt’s treatise that the reader has a 
comfortable sense that his author is giving him no scamped work. 
Everything capable of verification has been verified, and nothing is 
repeated in slovenly fashion unchecked. For such a work not only 
professed entomologists, but all naturalists who from time to time 
require precise information as to lepidoptera, will be erateful to Mr. 
Tutt, and his books will be required in every working library of 
natural history. Nothing of the kind has hitherto been attempted, 
and by reference to them much searching and weary correspondence 
will be avoided. 
The present volume deals with the Psychides and part of the 
Lachneides. Whether the views adopted by Mr. Tutt on questions 
of classification and the like are sound or not can, of course, only be 
judged by specialists, but it will be evident to any student of zoology 
that he has attacked these problems in a most fruitful way, and that 
in each of the numerous discussions of special questions he has pro- 
vided a marshalling of the facts which will help succeeding students. 
Several sections of this kind are introduced relating to general 
questions of the morphology of lepidoptera, especially the nature of 
metamorphosis and the structure of pup. In addition to these there 
is an important chapter written by Dr. T. A. Chapman on the 
phylogeny of the lepidopterous pupa, a subject on which he is the 
recognised authority. 
In connection with the significance of larval moults, reference is 
made to the interesting observations of Chapman on variation in 
number of moults in Arctia caia, but there appears to be no account 
of Dyar’s remarkable evidence relating to similar variations. Accord- 
ing to Dyar’s observations on several species, the larva—as measured 
by the width of the head—increases in size at each moult in a definite 
geometrical ratio, and when stages are added or omitted the ratio is 
halved or doubled accordingly. It is most desirable that further 
investigation of this curious phenomenon should be made, and it 
would have been well to direct the attention of students to the subject. 
Tt is noticeable that while morphologists, in reasoning baged an 
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