DIPTERA. 5 



work that has been done on Diptera during the two decades 

 has far exceeded that of any previous corresponding period. It 

 therefore seems necessary to add a bibhography bearing on 

 New England dipterology pubhshed since the Aldrich Catalogue. 

 The double-number system — year and page — has been adopted 

 in referring to each publication. 



The many problems in nomenclature that arise in attempting 

 to follow the works of the various authors, present a task that 

 greatly lessens the joy of recording the species of a given region. 

 A faunal list should contain all published names bearing on the 

 subject except (for brevity) those that have previously been 

 placed in the synonymy. In other words such a list is not the 

 place in which to make a synonym deliberately without proving 

 that it really is such. However, as a friend remarked, you can- 

 not conscientiously recognize a genus or species that you know 

 should be in the synonymy even if you have not the time to thor- 

 oughly discuss the question. The appalling number of genera 

 that have been made in some families, upon slight and often 

 sexual characters, form a great hindrance to a more logical 

 and consistent study of a family. 



It is still quite difficult to estimate the number of Diptera 

 actually occurring in New England, but it is safe to state that 

 the number recorded in this list is probably less than three- 

 fourths of the number that will eventually be found. The fol- 

 lowing is a summary of the families and number of species. 



List of Families and the Number of Species and Varieties Recorded. 



Tanyderidae 1 



Ptychopteridae 3 



Anisopodidae 9 



Tipulidae 264 



Dixidae 8 



Culicidae 48 



Psychodidae 12 



Chironomidae 120 



Cecidomjdidae 232 



Mycetophilidae 176 



Sciaridae 34 



Bibionidae 16 



Scatopsidae 6 



Simulidae 9 



Blepharoceridae 1 



Xylophagidae 12 



Coenomyiidae 2 



Stratiomyiidae 43 



Tabanidae 75 



Rhagionidae 20 



Cyrtidae 15 



Bombyliidae 45 



Therevidae 16 



Scenopinidae 2 



Mydaidae 1 



Asilidae 86 



Dolichopodidae 246 



Empididae 180 



Lonchopteridae 2 



Phoridae 56 



Platypezidae 26 



Pipunculidae 35 



Syrphidae 239 



Conopidae 23 



Pyrgotidae 3 



Oestridae 6 



Phasidae 20 



Tachinidae 228 



Megaprosopidae 2 



Dexiidae 28 



Sarcophagidae 57 



Calliphoridae 19 



Muscidae 248 



Scatophagidae 50 



Helomyzidae 20 



Clusiidae 19 



Borboridae 18 



Phycodromidae 2 



Sciomyzidae 49 



Sapromyzidae 36 



Lonchaeidae 10 



Pallopteridae 3 



