Generic Position of certain Musclda\ 345 



Deyiu cremides {ibid. p. 81-2. — N. America) must be can- 

 celled as unrecoguizable. The specimen that the writer 

 found in the Museum collection doing duty as the type does 

 not agree with the description, and is a female of Dinera 

 grisescens, Fin., a species apparently not included in Aldrich's 

 ' Catalogue of North American Diptcra,' where (p. 500) Dexia 

 cremides, Walk., is placed under Myiocera. 



Dexia ogoa (ibid. p. 841. — Nova Scotia) must also be 

 cancelled as unrecognizable, since the type is not now to be 

 found in the ]Muscum collection, and Walker states that 

 Mheu he described it the head was missing. 



Dexia dirpfiia {ibid. p. 836. — Locality unknown) is a 

 Myiocera, Rob.-Desv. 



Dexia prexaspes (ibid. p. 837. — Georgia, U.S.A.) is a 

 Ftilodexia, 13r. & von Berg., to which genus Estheria abdo- 

 viinalis, Rob.-Desv., from Nova Scotia (assigned l)y Aldrich, 

 Cat. N. Amer. Dipt. p. 501, to Dexia), also belongs. 



Dexia abzoe {ibid. p. 846. — Georgia, U.S.A.). — Type not 

 now to be found in the Museum collection ; name should 

 consequently be cancelled. 



Tachina corythus (ibid. p. 797. — Georgia, U.S.A.). — 

 So far as it is possible to determine from a comparison of 

 Walker's type and the descriptions, Coquillett (Rev. Tachi- 

 nidae, p. 73) is apparently correct in quoting T. corythus, 

 Walk., as a synonym of Xantfiomelana (Pkasia) atripennis, 

 Say. 



Tachina alops {ibid. p. 796. — Georgia, U.S.A.). — Cor- 

 rectly referred by Coquillett {op. cit. p. 73) to the genus 

 Beskia, Br. & von Berg. 



De.ria hypsa {ibid. p. 866. — Locality unknown) is a 

 Fycnosoma, Br. & von Berg. 



Musca liris {ibid. p. 882. — Locality unknown) is the 

 female of Rutilia minor, Macq. (Australia and Tasmania), 

 which apparently should be referred to a new genus near 

 liutilia. 



Dexia albifrons (Ins. Saund. — Dipt. iv. (1852) p. 317. — 

 United States) is a lihynchodexia, v. d. Wulp (Bigot, pro 

 parte) . 



Dexia canescens {ibid. p. 310. — United States) is a Ptilo- 

 dexia, near and perhaps only a dark form of F. tibialis, 

 Kob.-Desv. 



De.cia jjedestris (ibid. p. 313. — United States) has nothing 

 to do with Dexia. It is synonymous with Tachina menapi.s, 

 Walk. (List Dipt. Ins. Brit. Mus. iv. (1819) p. 7G9), the 



