50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5 1 



Mesembrma mystacea et spp. — No hypopleural hairs or pile. Pteropleural 

 black pile present. Sternopleural bristles I. O. I, but often hard to distinguish 

 from the black hairs or pile. Venation like Stomoxys, also like Myiospila, 

 fourth vein partly continuous with hind border. This and the five following 

 genera have the inner side of middle tibiae furnished with one or more strong 

 bristles. 



Metamesembrina (gen. now ) meridiana Linne (det. Brauer and von Bergen- 

 stamm, Alaska). — No hypopleural hairs or bristles. Pteropleural bristly hairs 

 present. Sternopleural bristles o. o. I. Fourth vein reaching front margin of 

 wing before tip and arcuate at bend. 



Bumesembrina (gen. nov.) latreillei Robineau-Desvoidy, et spp. — No hypo- 

 pleural hairs. Pteropleural hairs present. Sternopleural bristles I. o. 2. 

 Venation as in Mesembrina, but fourth vein more continuous with hind margin. 



Dasyphora pratorum et spp. — No specimens. Venation of Lucilia (ace. 

 Brauer and von Bergenstamm ). 



Pyrellia cadaverina ( 1 spm. det. Brauer and von Bergenstamm), serena 

 Meigen (det. Coquillett), et spp. — No hypopleural hairs. Pteropleural hairs 

 present, bristly and short in cadaverina. Sternopleural bristles 1. o. 3 (some- 

 times 4) ; in the single specimen of cada/verina 1. o. 2 on one side and 1. 0. 4 

 on the other, but probably normally I. o. 3. Fourth vein arcuate at bend. 



Pseudopyrellia comicina et spp. — No hypopleural hairs. Pteropleural hairs 

 present. Sternopleural bristles 1. 0. 2, but the hind pair with anterior bristle 

 placed nearly as high as the posterior one. Fourth vein arcuate at bend. 



Phasiophana obsoleta et spp. 



Cyrtpneura sp. (det. Brauer, N. C. and Cala.). — No hypopleural hairs 

 Pteropleural bristles present. Sternopleural bristles 1. 0. 2. Fourth vein 

 arcuate at bend, apical cell narrowly open. Morellia micans (det. Coquillett) 

 and hortorum have nearly these characters, and it is likely that the present 

 North Carolina and California specimens belong to Morellia. 



Auchmeromyia spp. — This genus evidently belongs here. It probably has 

 either hypopleural or pteropleural hairs or bristles. 



Ochromyia jejuna ]. C. Fabricius (N. W. India) et sp. (Amboyna). — 

 Hypopleural bristles present. No pteropleural bristles, but yellowish pile 

 present. Sternopleural bristles 1. 0. 1. Venation typical. 



It will be at once seen from the above notes that the characters of 

 the presence of one or other or absence of both the hypopleural 

 and pteropleural bristles or hairs are the final determining test in 

 the separation of the two superfamilies. 



Metamesembrina, Graphomyia, and Synthesiomyia do not have 

 the fourth vein continuous in any part of its extent with the hind 

 margin of wing, but all show a more or less distinct posterior inclina- 

 tion of fourth vein where it joins the wing margin, this being less 

 distinct in Synthesiomyia. The genera with this venation might be 

 considered by some students to form an aberrant group of the 

 Anthomyioidea, exhibiting a transition toward the Muscoidean type 

 of venation; but, considered from all points of view, their relation- 

 ships are mainly with the Muscoidea. 



