vi 



AUTHOR S PKEFACE. 



Dr. Franz Heikertinger and Dr. K. Holdhaus of Vienna, 

 Dr. Kai L. Henriksen of (Copenhagen, Mons. P. Lesne of 

 Paris, Mons. Severin of Brussels, and Professor G. Jacobson 

 of Leningrad (through the good offices of Dr. B. Uvarov). 

 It is a pleasure to express my warm thanks to all persons 

 concerned. 



As to the determination of specimens, in most cases 

 I have seen the types, while in those cases where I have 

 not had the opportunity of seeing the types the fact is 

 stated at the end of the description of the species. 

 In this connexion I wish to record my thanks to Dr. R. 

 Gestro, of the Genoa Museum, who, with his usual courtesy, 

 loaned me several types from the Fea Collection. I have 

 also seen types or co-types belonging to Mr. H. E. Andrewes, 

 which are now incorporated with the main collection of the 

 British Museum, and to him also my thanks are due. 



As regards Motschulsky's species, a few are incorporated 

 in the body of this work and in the dichotomous keys, 

 for reasons stated under each species. The rest are recorded 

 only by means of translations into English of the original 

 diagnoses. These latter species (together with a few species 

 of doubtful position described by other authors) find no 

 place in the keys nor in the consecutive numbering of 

 species throughout the volume. Formerly it was believed 

 that Motschulsky's types were completely lost, but it is 

 now known that some of them, at least, have beerr 

 recovered, and these are conserved in the Museum of 

 the University of Moscow *. Owing to the difficulty 

 experienced by entomologists in dealing with these species 

 described by Motschulsky, it is, I think, urgently necessary 

 that a report should be published on the present condition 

 of his collection. This object could easily be achieved 

 if the authorities of Moscow University could see their 

 way to lend the collection to the British Museum, where 



# B} r a misapprehension Mr. G. J. Arrow stated in the preface of his 

 volume on Erotylid^, etc., published in this series in March, J.925,. 

 that Motschulsky's types are in Petrograd (Leningrad). 



