REVIEW 



NORTH AMERICAN TRYPETINA. 



INTRODUCTION. 



IN 1860, at the time of the publication of my paper on the 

 Trypetidse, contained in the first volume of these Monographs, 

 only twenty-three North American species of this family were 

 known. Since then, this number has reached sixty-one. Among 

 these additions there is a number of species of previous authors, 

 concerning which I did not possess sufficient information at the 

 time of my earlier essay. Moreover, a number of species 

 published by Wiedemann became accessible to me in type speci- 

 mens, through the kindness of the Berlin and Vienna Museums. 

 Since that time, also, several other authors have published new 

 species belonging to the same group. And, finally, the systematic 

 distribution of the group Trypetina has obtained, for the Euro- 

 pean species, a more solid foundation. 



It would seem to be time, therefore, to undertake an entirely 

 new work on the Trypetina of North America ; but as the plan 

 of the present series does not well admit of it, I have adopted the 

 form of a supplement to my previous paper. One of the principal 

 aims of the present essay will be, the adaptation to the American 

 fauna, as far as it is possible, of the systematic distribution intro- 

 duced among the Trypetina of the old continent. While I was 

 engaged on Monographs, etc., Part I, the number of the North 

 American species with which I was acquainted, was, as yet, too 

 insignificant for an attempt at a subdivision in smaller groups ; 

 besides, similar attempts, undertaken for the European species 



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