328 
STUDIES IN AMERICAN EPHYDRIDAE (dIPTERa) 
This genus, as liased on its genotype, is fairly well characterized 
by the weak or undeveloped niacrochaetae, the frontals and 
fronto-orbitals being scai’cely discernible even the ocellars and 
the verticals are very weak. The face is inedianly wrinkled 
or papillose, with a well marked rounded shining tubercle. 
The arista is liare or pubescent, and the mesonotum and scutellum 
finely scabrous or granulose, giving them a subopaiiue ajipear- 
ance; the setiilae are numerous and ii-regular. The alula of the 
wings is strongly auriculate. Regarding the facial structure 
and the sculiituring of the mesonotum and scutellum, there 
are some species of Athyroglossa possessing these characteristics, 
and one or two show considerable recession in the development 
of the frontal bristles and aristal pectination. Therefore one 
must be careful in working with such species. A character 
which seems to be valualile in sejiarating these genera is the 
development of the alula. This portion of the wing in Athyro- 
glossa is very narrow, sometimes scarcely discernible, while in 
(rymnopn it is very broadly lobed. 
(lenotype. — Gymnopa aenea Fallen AS'IO) = Syr ph us suhsuUaus 
Idibricius (1794). 
Walker described two siiecies from the United States, which 
he credited to this genus, but I cannot secure trace of the types 
in the British Museum, and therefore cannot recognize them. 
His descri])tions, however, a])i)ly nioio to .some of the Psilo])ini 
than to this genus. 
These Walkerian species are: 
Gyvvuopa 'uigroaenea Walker, Dipt. Saund., 413, 1852. 
Gymnopa tars(tUs Walker, Dipt. Saund., 413, 1852. 
Synonymy. — Gymnopa as a generic name was usi'd in the 
jiresent sense until 18()4, when Schiner associated Latreille’s 
name Mosillus with this grou]). Locuv, in 187()b iirotested 
against tlu^ use of Mosillus on the grounds of sixty years 
usage' of Gymnopa and the doubtful meaning of Mosillus. 
B('(‘k('r lu'ld th(^ same' opinion. Since' bS()4, the' gre)U]) has be'e'ii 
e-alle'd by e'ithe'r name', ae‘e'e)rding te) the' view e)f the' stuele'iit. The' 
namemV/e>.s///7/.s first- nppe'are'd in the' litei-at ure' in ISIM, ])re)i)o.se'el 
by l^at re'ille'.-* 4’wo spe'cie's are' the're' e'it-e'd with (pie'rie's (.Musca 
“.Inhrb. ( Icli'lnl . ( l('s. Knik.'Ui, xi.i, l.sc'p. ioiil I.'), 1S7(). 
t X(iv. Diet. Hist. Niit., XXIV, 'I'iil). Mc'lli. I'.tei. 
