1922] Melander — Microsania, a New Genus of the Platypezidce 47 
the species have been found running about on a tent while in 
camp in the woods. Quite a few of the specimens are heavily 
parasitized by mites, of which several species are distinguishable, 
clustering on the underside of the abdomen. 
Summary. 
The genus Microsania, hitherto assigned to the Empididse, 
belongs to the Platypezidse. There exist in America two species, 
idential with two of the three European species. One of these, 
M. stigmaticalis, has previously been known from North America 
only through its original finding which was recorded under the 
name of Platycnema imperfecta. The genus is widely distributed 
from Alaska to Florida and Central America and apparently 
from its prevalence in Northern Europe and the mountainous 
districts of Western America has a circumpolar range. 
Bibliography of the, Species of Microsania. 
pallipes Meigen. C. Europe 
Meigen, Syst. Bes. vi. 356 (1830) Cyrtoma 
Macquart, Hist. Nat. Dipt. i. 360 (1834) Cyrtoma 
Rondani, Dipt. Ital. Prodr. i. 138 (1856) Platytelma 
Bigot, Ann. Soc. Ent. Fr. (3) v. 557 and 564 (1857) 
Microcyrta 
Schiner, F. A. Dipt. i. 76 (1862) Cyrtoma 
Lioy, Atti. Inst. Yen. (3) ix. 723 (1863) Pachypeza 
pectipennis Meigen C. and N. Europe; W. N. America 
• Meigen, Syst. Bes. vi. 356, pi. lxvi. f. 15, 16 (1830) 
Cyrtoma 
Zetterstedt, Dipt. Sc. i. 335 (1842) pectinipennis; viii. 
3013 (1849) pectinipes 
Wahlgren, Ent. Tidskr. xxxi. 47 (1910) pectinipennis 
stigmaticalis Zetterstedt N. Europe; and N. and Cent. America. 
Zetterstedt, Lapp. 534 (1838) Cyrtoma 
Dipt. Sc. i. 334 (1842); viii. 3013 (1849); 
xiii. 4998 (1859); 
Bonsdorff, Finl. tv. Ins. i. 157 (1861) 
Lundbeck, Dipt. Dan. iii. 19, f. 3 (1910); 
