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Show 178 middle toe, 1.25- 1.35. Inner webs of only four outer primaries distinctly emarginated; third to fifth quills longest; first shortest Tail nearly even, the lateral pair of feathers slightly the shortest. Adult:- Entire upper surface, including the side of the head and neck, uniform dark plumbeous. Tail black, crossed at a little beyond the middle by a narrow, continuous band of whte, and sometimes with a second,' less continuous, band, nearer the base. Entire lower parts, including the chin and throat and lining of the wing, continuous pure white, the sides of the breast, and sometimes the throat, with a few fine shaft- streaks of dusky. Inner webs of the primaries ashy, barred with dusky beyond their sinuations. Bill slate- black, the basal two- thirds of the lower mandible and that portion of the upper below 4: he cere pale yellow; cere, rictus, and base of lower mandible bright orange- red; tarsi and toes deep reddish- orange; claws black. The vaiiations in the plumage of this species consist mainly in the presence or absence, and amount when present, of plumbeous wash on the outer side of the tibiae, and the streaks of the same on the throat Tn No. 64943, the outer side of the tibiae is almost wholly plumbeous, while in No. 66334 it is entirely absent; in the former, each feather of the throat has a distinct dusky shaft- streak, while in the latter the throat is immaculate. Other specimens are variously intermediate between these extremes. No. 66334 differs from all others examined in having two bands on the tail, instead of only oue; these are both well defined, though the anterior one is not, like the posterior one, continuous. No other differences, however, can be detected, while in other specimens this second band is found indicated by transverse white spots on the inuer webs. List of specimens in United States National Museum. I i 5 Locality. When collected. April 4.1887 ,1873 , 1873 ,1873 ,1873 ,1873 From whom received. 47364 04941 64942 64943 66334 66335 67* 60 67863 67864 562 160 552 35 S65 905 J ad. | - a d . < f ad. ,9 ad. h- ad. - ad. < f ad. | - a d . ? ad. Costa Rica do d o j% do do Costa Rica ( Old Harbor). Costa Rica ( Talamanca). do - do.... C J. CarmloL Prof. Wm. M. Gabb. Do. Do. Do. Do. Do. Do. Do. Other specimens examind.- In mus. G. N. Lawrence, 3 ( Panama); R. Ridgway, 1 ( Costa Rica); total, 13. LEUOOPTERNIS PRINCEPS. Leucopternis princeps RCL. & SALV. P. Z. S. 1865, 429, pi. xxiv; Ex. Orn. 1868,122; Nomencl. Neot. 1873,119.- LAWR. Ann. Lye. N. Y. ix, 1868,133.- SALV. Ibi&> 1872, 241- 243. Buteo princeps GRAY, Hand List, i, 1869, 9. Urubitinga princeps SHARPK, Cat. Ace. Brit. Mas. 1874,220. jjab.- Costa Rica ( mountainous districts). Wing, 14.00- 15.20; tail, 7.50- 9.00; tarsus, 3.25- 3.80; middle toe, 2.90. Fourth quill longest, the fifth scarcely shorter; first 3.50 shorter than the |