16 BULLETIN 50, UNITED STATES NATIONAL mupnus. 
shield, 36.5-44 (39.7); tarsus, 47.5-58 (52.7); middle toe, 48.5-61 
(54). . Ae 
Adult female—Wing, 124-134 (129.7); tail, 41.5-47 (44.2); bill 
from nostril, 16-20 (18.6); from posterior margin of frontal shield, 
41-45 (43.3); tarsus, 52-60 (56.5) ; middle toe, 54-63 (56.7). 
From careful examination of the fairly satisfactory series available, 
it seems extremely probable that the black-backed specimens (J. 
nigra) and those with purplish brown or maroon back (commonly 
called J. melanopygia) are simply color phases of one species. Not 
only do they occur together wherever either is found, but the two 
extremes are connected by intermediate specimens. Parra hypo- 
melzna Gray represents an intermediate condition of plumage, the 
colored plate indicating a bird with black back and scapulars, but 
brown’ wing-coverts and tertials. 
It is possible that these separate phases may be amenable to local 
influences, to a greater or less degree, the black-backed one pre- 
dominating in one locality, the maroon-backed one in another. It 
is significant that the series examined from the Rio Cauca district 
of western Colombia (five adult males and three adult females) all 
represent the brown-backed phase. 
Panamé (David, Chiriqui; Calobre, Castillo, and Santa Fe, Ver4- 
gua; Lion Hill; Rio Trinidéd; Bohio; Laguna de Pital), and Co- 
lombia (Rio Atrato; Cartagena; delta del Rio Magdalena; Barran- _ 
quilla; Santa Marta, Cienega, Fundacién, Mamatoco, and Bonda, — 
Santa Marta; Santa Elena, Antioquia; Bogoté; Laguna de Patéria; - 
Guabinas, Rio Cauca). Northeastern Peru (Sarayacu) ? 
@ Sixteen specimens. 6 Nine specimens. 
Bill 
from 
Bill pos- , 
Locality. Wing. | Tail. jee aes Tarsus. Maile 
' of 
frontal 
shield 
MALES. 
Five adult males from Panama (Canal Zone).......... 119.2 | -38.2 18 38.9 52.4 53.5 
One adult male from Rio Atrato, Colombia........... 114 39 18 38 51.5 56 
Three adult males from Santa Marta, Colombia.......| 120 41.5 16.8 40.7 54.3 55.5 
Two adult males from “Bogota” Colombia........-... 117.5 38 17.2 40.2 57.5 58.5 
Five adult males from Rio Cauca, western Colombia..! 117.4 41.8 16.6 40.1 50.5 61.5 
FEMALES. 
Two adult females from Panama (Canal Zone)........ 180.5 44.5 19.5 44.5 59.5 | 56 
One adult female from Barranquilla, Colombia........ 124 44 19.5 44 52 54 
Two adult females from Santa Marta, Colombia....... 128 44.2 18.7 42 56.7 56. 2 
Three adult females from Rio Cauca, western Colombia.| 130.7 42.8 18.5 42.8 56 56.8 
One adult female (?) from “ Bogota,’”’ Colombia. ...... 134 47 16 44.5 60 63 
