342 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XIII. 



Piaya cayana venezuelensis CORY, Field Mus. Nat. Hist., Orn. Ser. I, 1915, 

 p. 284 (Orope, Zulia, Venezuela). 



Range: Low forested region in northwestern Venezuela. 



4: Venezuela (Orope and Catatumbo, Zulia), including the type. 



*Piaya cayana columbiana (Cabanis). COLOMBIAN SQUIRREL CUCKOO. 



Pyrrhococcyx columbianus CABANIS, Journ. fur Ornith., 1862, p. 170 (Carta- 

 gena, Colombia). 



Piaya cayana columbiana STONE, Proc. Acad. Nat. Sci. Phila., 1908, p. 498; CORY, 

 Field Mus. Nat. Hist., Orn. Ser., I, 1915, p. 308; CHAPMAN, Bull. Am. Mus. 

 Nat. Hist., XXXVI, 1917, p. 319 (Puerto Berro; Chicoral; Alto de la Paz; 

 Subica, Colombia). 



Piaya columbiana RIDGWAY, Boll. U. S. Nat. Mus., No. 50, VII, 1916, p. 47, 

 in key. 



Range: Northern Colombia (in the interior, from central Andes to 

 western slope of eastern Andes, northward to the coast) and east in 

 coast region of northwestern Venezuela. 



5: Colombia i; Venezuela (Maracay 2, Rio Aurare 2). 



Piaya cayana mesura* (Cabanis). BOGOTA SQUIRREL CUCKOO. 



P[yrrhococcyx] mesurus CABANIS, Mus. Hein., IV, 1862, p. 83 (Bogota). 

 Piaya cayana mesura CHAPMAN, Bull. Am. Mus. Nat. Hist., XXXVI, 1917, 

 p. 321 (La Palma; Andalucia; Quetame; Buena Vista; Barrigon, Colombia). 



Range : Andes of eastern Colombia (eastern slope of eastern Andes) . b 



"Piaya cayana nigricrissa (Cabanis). BLACK- VENTED SQUIRREL 

 CUCKOO. 



Pyrrhococcyx nigricrissa CABANIS, Journ. fur Ornith., 1862, p. 169 (Babahoyo 

 or Esmeraldas, western Ecuador, ex. Sclater); Id., Mus. Hein., IV, 1862, p. 85. 



Piaya nigricrissa SCLATER (Norn, nud.) Proc. Zool. Soc. Lond., 1860, p. 285 

 (Babahoyo, western Ecuador). 



surface of the rectrices and other characters. Reference to the difference in colora- 

 tion of the under surface of the rectrices was inadvertently omitted in my original 

 description of venezuelensis when comparing it with P. c. cayana. 



Piaya cayana mesura (CABANIS) : General coloration much nearer P. c. cayana 

 than to any other form and may be distinguished at once from P. c. columbiana and 

 P. c. venezuelensis by the much more blackish coloration and absence of distinct 

 rufous marking on the under surface of all (except the central pair) of the tail feathers. 

 P. c. mesura has the under surface of tail somewhat darker than in P. c. cayana and 

 the lower abdomen and under tail coverts are much more blackish. 



b According to Chapman (/. c.) this form occurs on "both eastern and western 

 slopes of the Andes at the head of the Magdalena Valley." 



e Piaya cayana nigricrissa (CABANIS) : Differs from C. p. mesura in having upper 

 parts darker and the ventral region and crissum distinctly black (not blackish gray) 

 and from P. c. columbiana by its much darker general coloration and absence of the 

 conspicuous bright rufous marking on the greater portion of the under surface of all 

 of the tail feathers; black crissum, etc. 



