124 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 51 



Subfamily MUSCIN43 



Tribe Mese m brin in i 



Two new genera are here proposed in this tribe, and the genus 

 Mesembrina is restricted as follows: 



Genus Mesembrina Meigen 



Type of the genus, M. mystacea Linne. Densely pilose flies. 

 Subalar pile present, representing the pteropleural bristles. Sterno- 

 pleural bristles I. o. 1. Fourth longitudinal vein very deeply and 

 roundly bent far before reaching margin of wing, which latter point 

 is same distance behind that termination of third vein is before ex- 

 treme wing-tip, the portion between bend and margin being fully 

 three times that in margin. Apical cell much narrowed, its mouth 

 width not over one-third its greatest width. Small crossvein dis- 

 tinctly before middle of discal cell. 



METAMESEMBRINA, gen. nov. 



Proposed for Mes. meridiana Linne. Hairy, not pilose, flies. 

 Subalar bristly hairs present, representing pteropleural bristles. 

 Sternopleural bristles o. o. I. Fourth longitudinal vein reaching 

 front margin of wing before tip, arcuate at bend. 



EUMESEMBRINA, gen. nov. 



Proposed for Mes. latreillei Robineau-Desvoidy. Hairy, not pi- 

 lose, flies. Pteropleural hairs present. Sternopleural bristles 

 1. o. 2. Fourth vein very slightly and roundly bent a little before 

 reaching hind margin of wing, the portion between bend and margin 

 about equal to the portion in margin. Apical cell very widely open, 

 its mouth width equal to about three-fourths its greatest width. 

 Small crossvein distinctly beyond middle of discal cell. 



Bumesembrina latreillei Robineau-Desvoidy. — Two specimens, 

 White Mountains, New Hampshire, Morrison; one, Colorado; two, 

 Washington State ; two, Kaslo Creek, British Columbia, June 18, 

 R. P. Currie and A. N. Caudell. All show face and parafacials sil- 

 very white from above. Antennae reddish yellow to brownish. 

 Palpi reddish or brownish red. 



Eumesembrina alascensis, sp. nov. 



Four specimens. — Kukak Bay, July 4; Kadiak, July 20; Saldovia, 

 July 21 : Juneau, July 25. All Alaska. Collected by T. Kincaid 

 (Harriman Expedition). 



