Introduction 6 



and heated by anthracite stoves. Here was installed a photographic 

 department, under the direction of Mr. H. J. Campbell, with facilities 

 for photo-micrography. 



A small laboratory has been arranged in connection with the 

 necessity for performing anatomical studies. A new technique for 

 making preparations of genitalia is being perfected, and a full account 

 of this will be given in a future number of this journal. 



3.— GENERAL AIMS. 



The primary object of Mr. Joicey in making this collection of 

 Lepidoptera is to advance in some way our scientific knowledge. 

 When he sent out Mr. Pratt and his son to Northern Peru in 1912, it 

 was in the hope that some species new to science would be obtained, as 

 well as for the gratification to be afforded by adding largely to the 

 collection. The formation of a large collection has its value, because 

 without access to plenty of material studies can only be incomplete, 

 and results are often erroneous. No proper view can be taken by com- 

 paring scattered material. Correct results are more readily obtained 

 with good series of specimens from all localities, provided with proper 

 data, and available in one place. 



No apology should be needed for amassing large collections, for 

 research into the problems affecting such variable organisms as Lepid- 

 optera is dependent for its success on the availability of large numbers 

 of specimens. 



The naming of new forms is a necessary work which must be 

 carried on by all who are possessed of new material, but we are con- 

 cerned also with other investigations. We consider it important to 

 work out all the material sent by the special collectors, and to prepare 

 a full analysis and a list of the forms met with in each area. Such 

 faunistic studies yield much information on distribution and relation- 

 ship. Several are in preparation, and we propose to publish the results 

 in this journal from time to time. 



Work on the structure of the genital armature has been com- 

 menced, and it is hoped that many doubtful questions affecting specific 

 distinctions may be cleared up, and that we may ultimately extend the 

 study in various ways. 



The present paper, dealing with the results of the Barns' Expedi- 

 tion, will be followed by one on the Lepidoptera of Hainan, and in due 

 course there will appear similar papers on the Lepidoptera of the 



