40 THE CANADIAN ENTOMOLOGIST 



The Cuterebrine flies are likewise too aberrant a type to be 

 longer included in the same family with any of the other groups. 

 They seem to have sprung from some old Mesembrinine stock, 

 but are to-day well removed from their nearest living relatives. 



It is now 23 years since Brauer and von Bergenstamm used 

 the names Masiceratidae and Hystriciidae, but in different senses 

 from those here employed. The family names must be accredited 

 to them, since they employed them for the family types. The 

 Masiceratidae as here revised includes but a fragment of the group 

 to which they gave the name, only two of their genera so far as 

 we yet know falling in it, these being Masicera and Ceroniasia. 

 But it takes in many of their Phocoreratidae and Blepharipoda, 

 ail of their W illistoniidae and Goniidae, their section Myxexorista 

 (1893) and some at least of their Baumhaueriidae and Germariidae, 

 The Hystriciidae as here revised includes all of their Hystriciidae 

 except Tropidopsis which belongs in the Pyrrhosiine subfamily 

 {Hexamera is not known to me), all of their Tachinidae, Tachinoidae, 

 Micropalpidae (Homoeonychia unknown to me) including their 

 section Erigone (1893), and a very few of their Pyrrhosiidae. It is 

 profitable to note these comparisons as showing how nearly these 

 authors in certain cases approached and how widely in others 

 they deviated from proper definition of the groups on a study of 

 the external adult characters alone. 



If the peculiar reproductive and early-stage characters of 

 Phasiopteryx are found to exist in Oestrophasia, the family will take 

 the name Oestrophasiidae B. B. (1889). The name Cuterehridae 

 was used in the present sense by Brauer and von Bergenstamm 

 in 1889, but the family was ranked as an "Unter-Gruppe." 



The Sarcophagidae of the present paper includes a large part 

 ■of the Sarcophagidae B. B., a part at least of their Rhinophoridae, 

 probably a part of their Phytoidae, probably all of their Miltogram- 

 midae and Paramacronychiidae, and Macronychia alone of their 

 Macronychiidae. In 1893 they referred Melanophrys to their 

 Paramacronychiidae, but this genus belongs to the Hystriciidae 

 of the present paper. The Dexiidae as here revised includes practi- 

 cally all of the Dexiidae B. B., and nearly all of their Paradexiidae. 



From various comparisons we are able to judge with con- 

 siderable certainty that the characters of the less adaptive struc- 



