Geomctridae of the Argentine Rejniblie. 
333 
Warren’s type (^) was a ^ from Paraguay. I have not 
seen the Parana series, and am not absolutely certain that 
all the others are correctly referred. Warren (^) says that 
the sexes differ considerably, but it would seem that the 
^s are also very variable inter se. 
I suppose, from Warren’s reference of the ^ to “ Cyma- 
tophoi'a ” {Melanolophia, infra) that it has no fovea, but I 
am not quite clear about his use of that name. It has 
certainly no close affinity with the commotaria group. 
The venation, etc., are typical for Stenalcidia, but if fovea is 
really wanting, it will form a new section, or allied genus. 
230. Stenalcidia dimidiaria (Guenee). 
Tephrosia dimidiaria, Guenee, Spec. Gen. des Lep., ix, 261 
(1858). 
Buenos Aires, common, sitting on trees, posts, etc. (A. F. 
Bayne); La Plata City, June 9, 1896 (Oldfield, Thomas), 
a worn ^ in coll. Br. Mus. 
Apparently distributed in the southern part of Brazil; 
I have also seen it from Paraguay and (a local race ?) from 
Ecuador. 
M. Doguin, in his MS. list, also records “ Stenalcidia 
dimidiaria, Walk.” from Tucuman. Walker’s Boarmia 
dimidiaria (List Lep. Ins., xxi, 355), from Bogotd, was 
erected quite independently of Guenee’s Tephrosia, but 
(sec. specim. typ.) happens to be also a typical Stenalcidia, 
so that his name becomes invalid. I believe, however, that 
the Tucuman species has proved to be entirely distinct 
from the Colombian ; hence the record must be allowed to 
lapse until further elucidation is forthcoming. 
231. Stenalcidia fusca (Warren). 
Stenalcidia fusca, Warren, Nov. Zook, iv, 472 (1897). 
Tucuman, 3 $ in coll, Dognin. 
Described from Paraguay; also occurs in S.E. Brazil. 
232. Stenalcidia differens (Warren). 
Stenalcidia differens, Warren, Nov, Zook, iv, 471 (1897).^ 
(^) La Plata City, one in coll. Rothschild, 
The species was described from Paraguay, whence also 
it is represented in coll. Br. Mus, Warren {loc. cit.) says 
that the La Plata example is smaller. 
