18 THOMAS SAY FOUNDATION 



identifying several European species occurring in our 

 fauna, and by the donation of paratypes of his species. 



Summary. 



One hundred and forty-five species and varieties, 

 belonging to sixteen genera, are described in the pres- 

 ent paper, and the genitalia are figured in 138 cases; 

 other figures bring the total number on the plates 

 to 170. 



A list of the included species is given in the ex- 

 planation of the plates. The number assigned to a 

 species in the text is in every case the same as the 

 number of the figure or figures illustrating it. 



In a large number of the species, the female has 

 not been described ; and it is possible that some errors 

 have occurred in identifying females with the wrong 

 male, as but few pairs collected in copula exist in col- 

 lections. 



Xot only is there much to be done in studying 

 the females, but there are beyond doubt many spe- 

 cies yet to be described, especially from tropical and 

 subtropical regions. Nothing is ever final in tax- 

 onomy. 



Only species seen by the writer are included. 

 The numerous old names which cannot be elucidated 

 at present (their types being lost or scattered in Euro- 

 pean museums) are to be found in the Catalogue of 

 1905, and are not repeated here. It is impossible to 

 follow any other course than to ignore them, or else 

 wait many years with the group in hopeless confusion. 

 The latter course seems especially undesirable since a 

 real key to the species has been found in the genitalic 

 characters. 



