330 
STUDIES IN AMERICAN EPHYDRIDAE (dIPTERa) 
(leiisoly sca])n)us, i)il()se, flattened, ovate area on dorsnni near apex; the male 
with several rounded indentations laterally near base. I'ore femora thick- 
ened, spinose beneath, with the proximal spine the lonf»;est (fi^. 5). All 
tibiae silvery on outer surfaces. Lenfi;th. — 2.S to 3.5 mm. 
Type. — cf ; Wildwood, New Jersey, July 18, 1008, (Cresson), 
[A. N. S. P. No. 6103]. 
The above description, in main part, jrives only those char- 
acters by which this sjiecies differs from s'nhsultdnt^, as ri'pre- 
seid-ml by thri'e spi'cimens from hiui'ojie, (hfferniim'd, and 
kindly seid do me, by Prof. Mario Bezzi, of Turin, Italy. 1 
have received specimens from vai'ious collections labeled 
(lymnopa tiana Walker and Gymnopa aenea Fallen. Fallen’s 
name is considered synonymous with subsultans. Ephydra 
{(lymnopa) nana Walker, I do not know, but the description 
sufrfrests tliis species. iVIr. E. E. Austin of the British Aluseum, 
to whom 1 sent specimens for conpiarison with Walker’s tyjie, 
|■('l)orted that the latter is not in the collection there. The 
sexes are difficult to distinguish. The indentures on the tilth 
abdominal segment of the male will help in most cases. 
Variation. — Tlie examination of a good seides of this siiecies 
shows comparatively little variation. There is some in tlu' 
extent of the jiollinose vo'st uie, the amount of jiapillose scul])tur- 
ing on the face, in the amount of milkiness of the wings, and 
in the color of the tibiae. The scabrous area at the apex of 
th(' abdomen is much less confined to the tlattened ovate 
area, and the lateral indentations are usually wanting, in the 
specimens from Seattle, Washington, and Saltaii’, Utah. In 
tlu'se the face is nearly denuded of the silvery coating, and the 
tibiae ar(' darker. Were it not for the sculptured li'ontal ti’i- 
angle, 1 would suspect the series to be a closely riJated form ol 
snhsultans. A good sei’ies of that spi'cies may show variations 
which will endanger the validity of the ])resent one. 
Synonymy. — Gymnopa nigroaenea and tar.ndis of alker 
an' unrecognizable from the descriptions, but suggest Jbnlopa 
ra,ther than Gymnopa. ddie ty])es cannot be located in tin' 
Itritish Museum. 
MnUT'ml E.V(iinincil. — lUt siK'ciiiipus. 
('an.\I)a: N('1.som, Ibilish (\)luiu})ia, .luly 17, |\Vash.|. 
M Ass.\('u esuTTs: (\)Ii.‘iss(‘l., S(‘i)t('iub('i' S, ((). llryaiil), [H. S. X. H.t 
