48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



Measurements. — Male (seven specimens) : "Wing, 71-76 (average, 

 73.5); tail, 61-70 (66.5); bill, 11-12.5 (11.7); tarsus, 23-25 (24). 

 Female (four specimens) : Wing, 64^67 (65.5) ; tail, 61-63 (61) ; bill, 

 11-12.5 (12) ; tarsus, 23-24 (23.5). 



Range. — Temperate Zone, Andes of Peru. 



Remarks. — A topotype of this form in the collection of the United 

 States National Museum (No. 159,870) shows no trace of a dusky or 

 blackish lateral crown-stripe, as called for in the original descrip- 

 tion, and on the absence of which Doctor Chapman mainly relied 

 to distinguish his supposed race supercilia'ins. Of four specimens 

 from the Warsaw Museum (two being topotypes), two have a trace 

 of such a dark line above the yellow superciliaries, while the other 

 two do not. This character would seem to have no geographical 

 significance. With nine specimens of typical striaticeps now avail- 

 able for comparison with four of superciliaris^ I now find that 

 the only difference of moment between these two is the slightly 

 brighter color of the upper parts in the latter — bright citrine in- 

 stead of dark citrine. And as the series of true luteoviridis exam- 

 ined show an equally great range in variation in this respect, I 

 should want to see a considerably larger series before finally accept- 

 ing supercilians. The smaller size, even if constant, could of itself 

 scarcely serve to hold the form, in my opinion. 



Doctor Chapman remarks that the narrowing of the green area 

 on the crown, between the broad yellow superciliaries, is a step on 

 the way toward Myiothlypis nigrocristata^ and so indeed it would 

 seem. In any study of the case the fact that Myiothlypis and 

 Basileuterus huteoviridis sometimes occur together would have to be 

 considered. 



Specimens examined. — Peru: Maraynioc, 9; Sillapata, 1; Nina- 

 bamba, 1; above Torontoy (10,700 and 14,000 feet), 3 (including 

 type of B. luteovhndis superciliaris Chapman) ; Cedrobamba (12,000 

 feet), Urubamba Canon, 1; Rumicruz (9,700 feet), Junin, 2. 

 Total, 17. 



BASILEUTERUS RICHARDSONI Chapman 



Basileuterus richardsoni Chapman, Bull. Amer. Mus. Nat. Hist., vol. 31, 

 1912, p. ICO (Andes west of Popayan [type locality] and Laguneta, Colom- 

 bia ; orig. descr. ; type in coll. Amer. Mus. Nat. Hist.) ; vol. 36, 1917, p. 550 

 (same localities; range; crit.). 



Description. — Above, including the wings and tail externally, dull 

 olive green; short superciliaries cream color; lores, eyelids, and post- 

 ocular spot dark olive; sides of the head dull citrine drab; under 

 parts wax yellow, more or less washed with olive lake, the chin 

 paler, almost whitish, the sides and flanks shaded with yellowish 

 citrine, the under wing-coverts grayish or greenish, the crissum 

 duller (near olive ocher) ; " iris brown; bill black; feet brownish horn 



