( 39 ) 

 37. Harpagus bidentatus (Lath.) 



Falco hidentatus Latham, Lid. Orn. i. p. 38 (1790. — " Cayana"). 



No. 645. <? ad., 20. iv. 00. " Iris light yellow, bill greyish black." 



38. Hypotriorchis rufigularis (Dand.) 



Falco rufigularis Daudin, Tniitc d'Orn. ii. p. 131 (1800.— ex Latham: Cayenne) [cfr. Nov. Zool ix. 

 (1902) p. 115]. 



Nos. 617, 623. c?¥ ad., 2, 6. iv. 06. "Iris dark brown, feet yellow, bill 

 black." 



39. Pisorhina choliba crucigera (Spix). 



[Strix choliba Vieillot, Nouv. Diet. vii. p. 39 (1817.— ex Azara, No. 48 : Paraguay).] 

 Stria crucigera Spix, Av. Bras. i. p. 22. tab. ix. (1824.-" juxta flumen Amazonum"). 



No. 605. ? ad., 29. iii. 06. " Iris light yellow." 



About this form cfr. Abhandl. Bayer. Akad. Wissensch. ii. Kl. vol. xxii. 3. 

 p. 575. 



40. Dendrocygna discolor Scl. & Salv. 



Dendrocygna discolor Sclater & Salvin, Nomenel. Ar. neotrop. p. 101 (1873.— "Venezuela, Guiana et 

 Brasilia." — type ex Surinam ; cfr. Cat. Birds Brit, Mug. xxvii. p. 162). 



No. 620. ? ad., 6. iv. 06. " Iris brown, feet pale greyish red, bill rather 

 darker." , 



This specimen is perfectly similar to another from Trinidad. In both the 

 lower hindneck is huffy grey, abruptly contrasted against the chestnut of the back. 



41. Ortalis motmot (Linn.) 



Phasianus Motmot Linnaeus, Syst. Nat. xii. 1. p. 271 (1 7(56. —ex Brisson : "Brasilia, Guiana." — As 

 typical locality accepted Cayenne ; cfr. Nov. Zool. ix. (1902) p. 120). 



Nos. 607, 609, 628, 639. <?(?, 29, 31. iii., 8, 17. iv. 06. " Iris brown, feet red, 

 bill greyish black. Skin on neck light red." 



No. 629. ? ad., 8. iv. 06. " Iris brown." 



These birds are practically identical with a large series from Surinam, British 

 Guiana, etc. 



0. motmot is also a Gnianan species, but seems to occur on both banks of the 

 Lower Amazons. Natterer collected it near Mangos, and the American Museum 

 of New York received it from Santarem (cfr. Auk 1891. p. 162). 



42. Crypturus erythropus (Pelz.) 



Thiamin erythropus Pelzeln. Verhandl. zool.-botan. Gesellsch. Wien, xiii. pp. 1127, 1129 (1863. — 

 Barra do Rio Negro). 



No. 649. " ? " jr. Obidos, 26. iv. 06. " Iris light brown, feet yellowish red, 

 bill black, below grayish." — Wing 164 ; bill 30 mm. 



Like the type of T. longirostris in the British Museum, this specimen has the 

 wing coverts, secondaries, middle and lower back, including the upper tail coverts, 

 strongly barred with buff or rufescent, and diners only by the ground colour of the 

 crown being more slaty, less blackish. It answers well to Pelzeln's description of 

 the female of C. erythropus (I.e.). 



This species is new to the fauna of the Lower Amazons, though collected by 

 Natterer near Manuos and on the Upper Rio Branco. 



