1887.] I'KOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 525 



wing), and the general color of the back, etc., lighter and decidedly 

 more olivaceous brown. 



Adult male (Diamautina Mountain, Lower Amazon, July 15, 1887) : 

 Head, neck, and chest uniform deep black, becoming duller black on 

 middle line of breast and upper part of abdomen ; rest of lower parts 

 plain dull olive (under tail-coverts wanting) ; back, scapulars, wing- 

 coverts, and rump rather lighter and clearer olive, each feather marked 

 with a large and very conspicuous transverse spot of deep black, these 

 spots largest and somewhat cordate on tertials, narrowest and more 

 bar-like on upper back; primaries and secondaries chestnut (this 

 color tinging somewhat the tertials and greater coverts), their inner 

 webs dusky terminally, the outer webs of secondaries marked with a 

 subterminal spot of dull black followed by a smaller terminal spot, or 

 margin, of paler chestnut or rusty ; tail (only two feathers remaining), 

 deep chestnut, broadly tipped with a lighter tint of the same, separated 

 by a brace-shaped bar of black, the shafts also black. Bill, legs, and 

 feet deep black; naked space on side of head (in dried skin) bright 

 orange. Length 6.50, wing 3.60, tail 2.50, exposed culmen .78, bill from 

 nostril .45, tarsus 1.20, middle toe .75. 



In addition to the characters mentioned above as distinguishing this 

 fine new species from P. nigromaciilata, its nearest ally, may be men- 

 tioned the entire absence of the white streaks (margined laterally with 

 black) on the upper back (just below the black of the hind-neck), which 

 are very conspicuous on the male, less so on the female, of P. nigromac- 

 idata.* 



Another specimen (same locality and date, but sex not determined) 

 is exactly like the one described above, except that the general color 

 above is rather brighter. Length (skin) 6.20 ; wing 3.55, tail 2.45, ex- 

 posed culmen .80, bill from nostril .50, tarsus 1.20, middle toe .75. 



[This species is dedicated to Mr. Bowman Riker, of Diamautina, 

 Brazil.— C. B. R.] 



12. Rhegmatorhinat gyninops, sp. nov. 



Sp. char. — Adult male (type Ko. 112286, Diamautina Mountains, 

 Lower Amazon, July 15, 1887; Mrs. 0. B. Riker): Head, neck, chest, and 



* Types examined. 

 \ Bhegmatorhina, genus uovem Formicariidarum {pi/-yficx=Jisstira; pt? = nasits). 



Gex. char. — Similar to Pklogopsis, Init differing very materially in the form of the 

 nostril, which consistsof a narrow lon^tudinal slit-like opening, overhung by a broad, 

 rather thickened, membrane or operculum. Orbital region entirely naked, the bare 

 space broadly oval, slightly i)ointed anteriorly (about midway of the lores), but 

 rounded posteriorly. Feathers of pileum lengthened, narrow, decurved, rather stiff, 

 and distinctly individualized, forming a loose crest when erected; those of the fore- 

 head and lores (anterior half) shorter, straighter, and more dense. Tail more than 

 two-thirds as long as wing, slightly rouuded, the feathers broad and rounded. Wing 

 about three times as long as tarsus, much rounded (fifth and sixth quills longest). 

 Tarsus more than twice as long as bill from nostril, booted. Colors j)lain. 



Type, it', gymnops, sp. noy 



