Melanism and Melanochroism in British Lepidoptera. 



(Demy 8vo., bound in Cloth. Price 2/6). 



Deals exhaustively with all the views brought forward by scientists to account for the 

 forms of Melanism and Melanochroism ; contains full data respecting the distribution of 

 melanic forms in Britain, and theories to account for their origin ; the special value of 

 "natural selection," "environment," "heredity," "disease," "temperature," etc., in 

 particular cases. Lord Walsingham, in his Presidential address to the Fellows of the 

 Entomological Society of London, says " An especially interesting line of enquiry as con- 

 nected with the use and value of colour in insects, is that which has been followed up in 

 Mr. Tctt's series of papers on ' Melanism and Melanochroism.' " 



British Butterflies. 



(Illustrated. Crown 8vo., Cloth, Gilt. Price 5/-). 



This book consists of 476 pages, contains 10 full-page illustrations, and 45 wood-cuts. 

 There are figures of every British butterfly. Sometimes three or four figures of the same 

 butterfly to illustrate the two sexes, underside and variation are given. The full-page 

 illustrations and most of the wood-cuts have been drawn by the well-known entomological 

 artist, Mr. \V. A. Pearce. 



Each British butterfly is described under the following heads : — (1) Synonymy, (2) 

 Imago, (3) Variation, with summarised diagnoses of all described forms, British and Con- 

 tinental, (4) Egg, (5) Larva, (6) Pupa, (7) Time of appearance, (8) Habitat and Distribution. 

 Besides these, there are extended remarks on each of the Tribes, Subfamilies, Families, 

 Divisions, and Superfamilies. The descriptions of the " Larvse " and " Pupae " are mostly 

 original. There are 282 aberrations and varieties diagnosed, of which 111 are described 

 for the first time. 



At the end of each chapter is a brief summary giving the following information, in 

 tabular form, for each species : — I. Dates for finding (1) the ovum, (2) the larva, (3) the 

 pupa (4) the imago. II. The Method of Pupation. III. Food-plants. 



The preliminary chapters consist of a series on the structure, of the Egg, Larva, 

 Pupa, tSic. ; also others on practical work — Collecting, Pinning, Setting, Storing, Label- 

 ling, &c. 



To be obtained from H. E. PAGE, " Bertrose," Gellatly Road, Hatcham, S.E. 



VIENNA 1893. 'c>TTT"T^TF7n^T7"T>,"V T^Tr"T^d geneva isge. 



Medal I. Class. -^* %J .M^ .M^ JCMJC\.X^ JL^ A X^ .EJ .M^ ^ Honorable Diploma. 



The G.K. Net is made of the best materials. 



The G.K. Net can be mounted or dismounted in a moment. 



The G.K. Net suits any stick, and may be carried in any pocket. 



The G.K. Net is every collector's delight. 



Diameter 14 inches. The most elegant net. 



Circumference 44 inches. The most practical net. 



Depth of the net 29 inches. The most durable net. 



Dimensions 1 by 4 by 11 inches. 

 The Lightest, the Handiest, the Cheapest Net. 

 One Quality, one Size, one Price only. 

 Send postal order 6/-, and you will get the G.K. Net free of all charge from — 



GRAF-KRUSI, GAIS, SWITZERLAND. 



