106 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5 1 



(Sitzungsber. Math.-Naturwiss. CI. k. Akad. Wiss., cvi, L p- 348), 

 who says that R. americana Brauer and von Bergenstamm is a 

 synonym of Bigot's species. B. adusta H. Loew is also typical of 

 the genus, which may be distinguished from Blepharipeca by the ab- 

 sence of apical scutellar bristles and thornlike macrochjetae. 



Riley myia albi fades Bigot. — Brauer (1. c.) says this is a synonym 

 of fulvipes Bigot, but in view of the widely removed type localities 

 it would seem that the point needs verification. R. aibifacies was 

 founded on a specimen from Brazil, while fulvipes is from Washing- 

 ton State. R. americana is from California. 



Subfamily Meigeniin^; 

 Genus Viviania Rondani 



It must be noted that this genus is characterized quite fully by 

 Rondani on p. 53, vol. iv, of Dipt. Ital. Prod., where the imperfectly 

 erected Biomyia (1. c, vol. 1, p. 72) is given as a partial synonym. 

 Biomyia does not cover the same forms, so far as any one knows, 

 and its one-line characterization entitles it to no notice in the face of 

 its author's subsequent rejection of it. It is therefore quite out of 

 the question to attempt to use it, especially since we have no defini- 

 tion of it. 



Viviania mutabilis Coquillett, etc. — Biomyia mutabilis is a Viv- 

 iania. So also is B. aurigera Coquillett. B. genalis Coquillett does 

 not belong anywhere near this genus. 



Viviania lachnosternae, sp. nov. 



One female, Urbana, 111. (No. 36,817, Forbes). "Supposed to 

 have bred in Lachnosterna adults." 



Length, 10 mm. ; of wing, 8 mm. Gray-cinereous, more or less 

 silvery. All three antennal joints and arista wholly reddish yellow, 

 the frontalia same color posteriorly, but darker in front. Para- 

 frontals blackish, thinly silvery. Parafacials more distinctly silvery. 

 Ptilinal area blackish, the lower portion of facial plate broadly yel- 

 lowish on oral margin. Palpi light reddish yellow. Mesoscutum 

 with five vittse, the middle one narrow behind and obsolete in front 

 of suture, the outer ones more or less triangularly widened, shorter 

 and more triangular in front of than behind suture. Wings wholly 

 hyaline, tegulse white. Legs wholly blackish, femora silvery below, 

 pulvilli smoky. Abdomen black, thickly cinereous pollinose. 



Type.— Cat. No. 10,913, U. S. N. M. 



