Ridgway on the Plumage of Gyrfalcons. 
93 
detailed description of the perfect adult dress of this dark form of 
the Gyrfalcon has, to my knowledge, been published. 
Adult — Above continuous plumbeous-slate, interrupted by a some- 
what Y-sbaped patch of pale buff, or buffy white, longiludinal markings 
on the nape ; the head perfectly uniform, the feathers of the dorsal-region 
and wings showing paler borders and transverse spots, there being about 
one pair (one on each web) of the latter on the exposed portion of each 
feather; remiges and primary coverts plumbeous-slate, without any spots, 
but with paler edges. Rump and upper tail-coverts more bluish than the 
back, and with distinct transverse spots and bars of light bluish-plumbeous, 
these bars regular and sharply defined on the upper tail-coverts, where 
they average, like the darker ones, about .25 of an inch in width; the 
shafts of these feathers conspicuously darker than the ground-color. Tail 
similar in colors and markings to the upper coverts, there. being about 
eight or nine bands on that portion of the tail not concealed by the coverts ; 
the light bars more or less mottled, finely, with darker ; tip of the tail, 
'60. xotanus octiropus (L,inn.) lemm. Green Sandpiper. — 
Brewer, Bull. Nutt. Orn. Club, III, Jan., 1878,49. Nova Scotia (apud 
Hurting). / 
.'ifi. Parra gymnostoma, Wagler. Mexican Jacana. ^-Merrill, 
Bull. NiAt. Orn. Club, I, Nov., 1876, 88. Vicinity of FoiVBfown, Texas 
(Merritt)S. ' / 
37. Lams canus, Linn. Common European Gull. — Brewer, Bull. 
Nutt. Orn. Cmb, III, Jan. 1878, 50. Labrador (fide Sjaunders). 
38. Podiceps dominicus, La/h. San Dominpo Grebe. — Merrill, 
Bull. Nutt. Orn. Club, I, Nov., 1876,88. Fort Brown, Texas {Merrill'). 
Note. — As it hasTipt seemed advisable to cite in full in the 
foregoing list all the refef^nces relating to the occurrence of the 
species added by Dr. Merrilland Mr. Sennett, it may be stated that 
full synonymy and detailed descriptions of the Rio Grande birds 
added by these gentlemen may^be fbmid in the following papers : — 
1. Notes on the Ornithology of the LowciKRio Grande of Texas, from 
Observations made during the Season of 1877. By George B. Sennett. 
Edited, with Annotations, by Dr. Elliott Coues, U. S. A., Bull. U. S. Geol. 
Surv. Terr., Yol. IV, pp. V-66, February 5, 1878. 
2. Further Notes on the Ornithology of the LovverAljo Grande of 
Texas, from Observations made during the Spring of 1878. Bythe same. 
Bull. U. S. Geol. Surv. Terr., Vol. V, pp. 371-440, November 3 8 79, 
3. Notes on tjie Ornithology of Southern Texas, being a List ofNpirds 
observed in the Vicinity of Fort Brown, Texas, from February, 1876yt.o 
June, 18^8. By Dr. James C. Merrill, Assist. Surg. U. S. A. [With An-' 
notations by Robert Ridgway and Dr. T. M. Brewer.] Proc. U. S. Nat. 
Mus.f Vol. I, 1878, pp. 118-173. 
A — 
