315 
Geometridae of the Argentine BegyiMic. 
antemedian line obsolete, postmedian rather distinct at costa, be¬ 
coming weaker, and vanishing after no other markings ; hind¬ 
wing beneath somewhat as above, but rather browner-shaded 
costally, jjostmedian line reaching to costa, but nowhere very 
strongly-marked or thickened, an indistinct diffuse discal spot. 
Head (with palpus and antenna), body and legs concolorous with 
wings. 
Palmira, September 13, 1903 (W. M. Bayne). Type in 
coll. L. B. Front. 
Not very close to any species known to me. May best 
be compared with Pero hicurvata, Warr, Nov. Zool., viii, 
490, but is greyer in colour, the median area of fore¬ 
wing broader, postmedian line less incurved to inner 
margin, marginal area unmarked, etc. 
206. Pero olivacea (Warren). 
Pero olivacea, Warren, Nov. Zook, xi, 578 (1904). 
Tucuman (type), in coll. Rothschild ; Los Vasquez, in 
coll. Dognin. 
Quoted in M. Dognin’s MS. as a Pergama, from which 
it may be assumed that the antennal pectinations are very 
short, and surmounted with cilia, as in the following 
species; but I have no note on the point. Pectinations 
certainly exist, being mentioned in Warren’s description. 
207. Pero amnicincta (Warren, MS.) (Prout), 
nov. sp. (Plate XLVIII, fig. 32.) 
Pero (Azelina) amnicincta, Prout, nov. sp. 
32-34 mm. Head and thorax greyish fuscous, abdomen 
slightly paler. Antenna with short pectinations, surmounted with 
fascicles of cilia (intermediate in structure between the present 
subgenus and Pergama). Fore wing with produced apex, strong 
tooth at end of and an angle at M^, below which the margin is 
sinuate inwards ; greyish fuscous, densely sprinkled with blackish 
scales ; lines blackish fuscous ; antemedian from costa at about 
4 mm. (beyond one-fourth) to inner margin at nearly 4 mm., 
strongly oblique outwards from costa, forming a deep projection 
into median area in cell, approximately perpendicular from M to 
■inner margin, but with rather strong curves on submedian fold and 
just below SM2, as in many of the genus ; postmedian from costa 
at nearly four-fifths to inner margin at or before two-tbirds, deeply 
incurved between and submedian fold, and again close to inner 
