221 
Qeometridae of the Ao'rjentine Rejmhlic. 
with the present one ; but it may be remarked that they 
seldom have SC^ arising from the cell. Rhodostroiihia, 
Hiib., Dithalama, Meyr., Dithccodes, Warn, Antanepsia, 
Turn., “ Erythrolophus ” semiustus, Hmpsn., and one or two 
species of Craspediopsis, Warn, alone occur to me, though 
exhaustive research would no doubt reveal a few others. 
None of those named bear any resemblance to Metasiopsis, 
and it would be easy to point out valid structural distinctions 
in each case. 
28. Metasiopsis flexicosta (Warren). 
$ Ptychopoda JlexicostA, Warren, Nov. Zook, vii, 101 
(1900). 
^ Ptychopoda mb^trigata, Warren, Nov. Zool., vii, 104 
(1900). 
Buenos Aires, December to March, flies out of “ Alfalfa” 
(lucerne) (A. F. Bayne); San Luis (W. M. Bayne); La 
Paz, Mendoza (W. M. Bayne); Parana, Entre Rios (both 
Warren’s types, besides other ^s, in coll. Rothschild); 
Tucuman (coll. Dognin et coll. Bastelberger); Goya, Cor- 
rientes (coll. Bn Mus.); Ocampo, Santa Fe, August 1902, 
and near Florenzia, Gran Chaco, October 1902 (S. R. 
Wagner, in coll. Bn Mus.). 
Apparently a common and widely-distributed species in 
the Argentine Republic, but with the exception of a pair 
from Sapucay, Paraguay, in coll. Bn Mus., I am not yet 
acquainted with any taken outside its boundaries. The 
Z is very variable in depth of colouring; the $ somewhat 
less variable, always pale, with much stronger and more 
diffuse lines (bands) on the underside, somewhat recalling 
those of our European Aspitates (Asjnlates). 
29. Metasiopsis triangularis (Warren). 
Ptychojioda triangularis, Warren, Nov. Zook, iv, 445 
(1897). 
Anteois triangularis, Warren, Nov. Zook, vii, 147 (1900). 
Gran Chaco, near Florenzia, October 1902, in coll. Bn 
Mus. 
The typical form occurs in S.E. Brazil. The only two 
Argentine examples which I have seen are of a slightly 
paler colour although in perfect condition; but I can 
see no essential difference. 
