284 
ouis B. Front on the 
be prolonged into a line interrupted by the vein-ends; forewing in 
addition with the costal extremity of the postmedian line weakly 
indicated. 
Retamito, November 28, 1903 (W. M. Bayne), type in 
coll. L. B. Front,; La Faz, Mendoza, Angnst 25, 1905 (W. 
M. Bayne), one ^ in coll. L. B. Front; Falinira, September 
13, 1903 (W. M. Bayne), one $ in coll. A. F. Bayne; 
Coronel Salas (W. M. Bayne), one ^ in coll. A. F. Bayne. 
The ^ is still unknown. The species is probably vari¬ 
able, both in size and in depth of colour. My La Faz 
besides being considerably larger than the type, is more 
heavily dark-speckled, particularly in the distal area. The 
shape of the wings, and the peculiar conrse of the jiost- 
median, gives a very characteristic and unmistakable asjaect. 
Whether sabnlosa can be allowed to remain permanently 
in Mimophyle must depend on the degree of weight 
attached to the frons (not protuberant in oioctuata), the 
shape and textnre of the wings, or other characters not 
yet specially studied. One curious feature, however, 
remains to be noticed, the variability of vein C of tlie 
hindwing, usually one of the most stable features in 
Geometrid venation. In the type-species (noctuata) this 
is very closely appressed to SC for some distance near the 
base, with apparently a break in the cell wall atone point, 
constituting point anastomosis (the scaling is too dense to 
allow of absolute certainty without denudation). In one 
example (La Faz) of srdndosa, the left hindwing shows this 
point-contact, the right wing an appreciably longer anas¬ 
tomosis ; while in the type specimen the anastomosis is 
still stronger, and in Loth wings. In palpus, antenna, legs, 
forewing venation and fovea, sabulosa agrees well enough 
with the generic characters of Mimophyle. This genus 
(and perhaps the allied Eupileta, Warr., Nov. Zook, xii, 
362; cf Froc. U.S. Mus., xxx, 521) may be regarded as 
making a transition from those with the more perfect 
anastomosis of C with SC {Narrayodes and Psodopsis) to 
those of more normal Boanniid structure, commencing 
with the following genus. 
138. Idialcis metria (Front), nov. sp. 
(Flate XLVIII, lig. 20.) 
d 9. 22-28 mm. Head and uppersurface of body and wings 
brown irrorated wdth fuscous; undersurface much paler, greyish. 
