PREFACE. 



which can be considered as undoubtedly fixed. There are, how- 

 ever, some, especially from the British Museum, which are not 

 entirely certain, the time I could spend at London not being suffi- 

 cient to determine all the species. The number, however, of spe- 

 cies mentioned in the Synopsis not examined by myself is but 

 small. 



I have added a Catalogue of all the species of South American 

 Neuroptera hitherto described, and of the new species contained 

 iu my collection. All the yet undescribed species have been added 

 to the present Catalogue, as their publication, which has already 

 partly been eifected (Gomphidae), will soon be terminated. 



There can be no doubt that the species named in the Synopsis 

 and in the Catalogue constitute only a fraction of the Neurop- 

 terous Fauna of America; may its incompleteness be soon shown 

 by a multitude of new discoveries. 



DR. H. HAGEN. 



KoEXiGSBEKG, 8th. April, 18 GO. 



Note. — The measurements given are in millimetres. A millimetre is 

 equal to .039 of the English inch, or ahout .04 (= ^.). Multiplying, 

 then, any number of millimetres by four, and setting off two places of 

 decimals, will at once give us the inches and fractions. 



