(35 ) 



27. Piaya cayana cayana (Linn.) 

 Cuculus cayanus Linnaeus, Syst. Nat. xii. 1. p. 170 (1766.— ex Brisson ; Cayenne). 



No. 631. <S in moult. 10. iv. i>6. " Iris brownish rod, bill yellowish green." 

 This specimen agrees perfectly with a series from Surinam and British 

 Guiana — i.e. P. c. guianensis (Cab. & Heine), cfr. Nov. Zool. xiii. p. 44. Additional 

 material, however, has convinced me that this form canuot be separated from 

 typical P. c. cayana (Linn.), the supposed distinguishing characters not being 

 constant. On the other hand, the examples from Pani (cfr. Nov. Zool. xii. p. 298) 

 differ by their considerably lighter, cinnamou-rufous upper parts, and paler, whitish 

 grey (not cinereous) thighs and crissum. Their proper name is probably 

 P. c. pallescens (Cab. & Heine), but the types should be examined. Anyhow, 

 they belong to a form distinct from true P. cayana. 



The range of the two first races of my review (Nov. Zool. xiii. p. 43) would 

 accordingly be as follows : — 



a. Piaya cayana cayana (Linn.). 



Pyrrhoeoccyx guianensis Cab. <S Heine, Mux. Hon. iv. (1862), p. 85 (Guiana). 



Cayenne, Surinam, British Guiana west to the Orinoco valley, and south to the 

 north bank of the Amazons (Obidos). 



b. Piaya cayana pallescens (Cab. & Heine). 



Pyrrhoeoccyx pallescens Cabania & Heine, Mtts. Hein. iv. (1862), p. 80 (" Nord-Brasilieu "). 

 N.E. Brazil: vicinity of Para and Maranhao.* 



28. Selenidera piperivora (Liun.) 



Ramphastoa piperivormi Linnaeus, Si/st. Nat. xii. 1. p. 150 (1766. — ex Brisson— " Cayana "). 

 Selenidera piperivora Pelzeln, Zm- Ornith. Bras. iii. (1809), p. 230 (Barra do Rio Negro). 



No. 632. ¥ ad., 10. iv. 06. " Iris brownish red, feet green, bill black, red 

 at the base." 



Perfectly identical with other females from British Guiana and Surinam. 

 This species occurs only on the north side of the Amazons. 



29. Monasa nigra (P. L. S. Mull.) 



Cuculus uitjer P. L. S. Miiller, Natursysi. Suppl., p. 90 (1770.- ex Buffon, sc. Duubeuton, 



PI. enl. 512 — Cayenne). 

 Monasa alia Pelzeln, Zar Omith. Brasil. i. (1807), p. 22 (Barra do Rio Negro). 



No. 602. 6, 28. iii. 00. " Iris brownish red." 



No. . ?, 18. iv. 00. "Iris brown."— Wing 135 ; tail 125 ; bill 37 mm. 



Both specimens are in moult. They do not differ from a large series of skins 

 from Surinam, British Guiana and the Caura valley. 



.1/. nigra is another of those Guianan forms the range of which extends to 

 the north side of the Lower Amazons, but which are not found on the south 

 bank of that river. 



* I examined a specimen belonging to the Museum of Sophia, Bulgaria, and found it perfectly 

 identical with our Para series. 



f This name appeared first in the tenth edition of the Syxt. Nat. p. 103, and then again in 

 the Mm. Ad. Frid. Prodromal ii. (1761), p. 17. The diagnosis, given in both cases, is, however, 

 nut sufficient to recognise the species. 



