229 
Geomctridae of the Argentine RepMic. 
and reminding in its aspect of the Palaearctic A. ocliro- 
leucata, H.-S., which in its turn belongs to a large and 
difficult group, embracing the African minorata, Boisd., 
and others. From the two preceding species, to which it 
also comes very near, it is distinguished by having the 
postmedian line somewhat differently formed, and not 
marked with blackish points; from alhidulata also by its 
whiter underside, and perhaps somewhat less elongate 
wings ; from unieornata by the usually less dusted upper- 
side and less ochreous vertex and costa. It may, however, 
be a local form of the last-named, its already mentioned 
dark aberration particularly approaching it; or it may 
prove to be a local race of one of the little-known species 
from further north, such as A. discriminaria, Walk., List 
Lep. Ins.,xxii, 732, from Venezuela. In any case it seemed 
desirable to figure and call attention to the form, and 
better not to refer it definitely to any known species than 
to risk associating it with the wrong one, very little 
material being available for detailed study. 
The two rather small weakly-marked specimens from 
Gran Chaco (near Florenzia, October 1902), in the British 
Museum collection seem likely to belong here, but I 
am not certain. To some extent they look intermediate 
between this species and alhidulata. 
42. Acidalia ATRiDiscATA (Warren). 
Craspedia atridiscata, Warren, Nov. ZooL, xi, 33 (1904). 
Tucuman, in coll. Dognin. 
Warren’s type was from Bolivia. I know of no other 
localities. 
43. Atyria chibcha (Schaus). 
Flavinia chibcha, Schaus, Proc. Zool. Soc., 287 (1892). 
Cyllopoda tenuis, Warren, Nov. Zool., xii, 312 (1905) (ab.) 
(nov. syn.). 
'L’ucuman and Metan, in coll. Dognin; Sante Fe 
(Ocampo) and Goya, in coll. Br. Mus. 
Schaus’ type was from Peru. The determination of the 
British Museum specimens is, I think, by Mr. H. Druce. 
Cyllopoda chibcha, oh. cuneifera,Viaxr., Nov. Zool., xi, 15, 
does not belong here, but to the following species. 
I refer provisionally to the genus Atyria (Hiib., Zutr., 
indescr.) H.-S., the species of the Cyllopoda group in which 
