'^h' ] PROCEEDINGS OF THE NATIONAL MUSEUM. 339 



area, the tii)s like the outer webs. In Deconychura the iiiuer webs of 

 the remiges are paler, but there is uo lighter patch. The geueric name 

 here chosen refers to the peculiarities of the tail, vvith teu rectrices 

 having the stiffened stems extended beyond the webs and bent down, 

 being derive<l from Ssna ten, oyvS claw, and ovpa tail. 



Deconychura typica, sp. nov. 



Adult female (type No. 1L9943,* collection TJ. S. National Museum, 

 Pozo Azul, Costa Rica, September 7, 1889; J. C. Zeledon) ; above light 

 bisti'r with umber-brown shading; feathers of the crown with blackish 

 edgings and narrow faint buffy shaft streaks, these shaft streaks also 

 seen on the hind neck. Wings, tail, and upper tail coverts between a 

 chocolate and chestnut brown; wing coverts like the back; remiges 

 shaded on the edges with the color of the back. Lores, superciliary 

 stri[)e and sides of head soiled buffy or pale chi}'^ color, with dusky 

 blackish or brownish shading. Chin and throat pale clay color; remain- 

 ing lower parts light olive-brown with umber shading; feathers of the 

 breast with blackish edges and central guttate spots of pale clay color, 

 the spots growing fainter posteriorly until on the crissum they are only 

 represented by faint shaft streaks. Under wing coverts ochraceous, 

 inner edges of quills vinaceous cinnamon with an ochraceous shade. 

 "Feet, legs, and lower mandible plumbeous; upper mandible black; 

 iris dark brown " (Zeledon, MS.). 



Wing rather long, third and fourth quills longest, first equal to 

 eighth, second longer than fifth. 



Length, 7.00; wing, 3.56; tail, 3.96; culmen, 0.92; nostril to tip of 

 bill, 0.58; gonys, 0.52; tarsi, 0.80. 



Habitat : Costa Rica and Panama. 



Thereis another specimen in the U. S. National Museum from Panama 

 (As))inwall) in immature plumage and with the bill broken off" at the 

 nostrils. 



Premnoplex, gen. nov. (type, Margarornis hrunnescens Lawr.). 



I have before me four of the six recognized species of the genus Mar- 

 garornis ; udmti\y, squainigera^stellata, riibigiiiosa,-c\iid brunnescens. The 

 latter presents peculiarities in the pattern of coloration and structure 

 that have led me to place it in a new genus, Prem)ioj)lex,\ which I would 

 characterize as similar to Margarornis^ but wing short and rounded, and 

 much more concave, while the second primary is shorter than the sixth,, 

 not longer; quills only faintly edged with lighter on the inner webs and 

 uo patch at the base of the feathers, extending to the shaft on the inner 

 webs of a pale fulvous color. This light-colored area in sqnaniigera, 

 stellata, and rubiginosa, commences on the tliird i)rimary and extends 

 across the secondaries, increasing in length along the web on each suc- 



* No. 33'20, collection Museo Nacioual de Costa Rica. 

 t Ups/iivoy = trunk of tree and Ttr/r/ddoo^ strike. 



