4 FAUNA OF NEW ENGLAND. 



northern limit of the Upper Austral life-zones. When a species 

 has been taken less than five times all data are given in full under 

 each State. In other cases the area-numbers are used with 

 the earliest and latest dates of capture. Figures and localities 

 in italics indicate the type localities of the species. 



Text-fig. 1. — Map of New England. 

 The numbers refer to the areas defined in the Introduction, 



Twenty years have passed since the publication of the "Cata- 

 logue of North American Diptera" by J. M. Aldrich. The 



