332 FIELD MUSEUM OF NATURAL HISTORY ORNITHOLOGY, VOL. I. 



Distinguishing characters: C, s. margaritensis may be distinguished 

 from C. s. isabellina by its much darker under parts and marking of the 

 outer rectrices. From C. s. distincta it differs by its much darker crown; 

 darker under parts and differently colored outer rectrices. From 

 C. s. ochracea it may be separated by its much paler under parts 

 and somewhat narrower tail band; from C. s. brevipennis by its larger 

 size and more immaculate under wing covers, etc. ; and from perplexa 

 by its somewhat paler under parts, less chestnut rufous upper parts, 

 and well marked white spots on the outer webs of the second and third 

 (outer) primaries. 



Specimens examined: Margarita Island, 40", 29. 



Remarks: All of the males have the crown plain, without rufous 

 and the inner web of the outer rectrix black and white. One female 

 has a small rufous crown patch. 



Cerchneis sparveria brevipennis (Berlep.}. 



Tinnunculus sparverius brevipennis Berlep., J.f.O., 1892, p. 91. 



Type locality: Curacao Island (off Venezuela). 



Range: Curacao, Aruba and Bonaire Islands. 



Characters: Similar to C. s. margaritensis in general coloration, but 

 with sides of the abdomen more or less spotted with black (in very 

 young birds the whole abdomen is sometime spotted) and with numerous 

 black markings on the under wing coverts; tail band about 25 mm.; 

 inner web of outer rectrix normally black and white; white spots on outer 

 webs of outer primaries as in margaritensis. 



Adult male: Wing, 163 to 169, average 167; tail, 120 to 128, aver- 

 age 125 mm. 



Female: Wing, 169 to 178, average 174; tail, 129 to 134, average 

 about 132 mm. 



Young male: Under parts heavily spotted with black, spots on 

 the sides forming a broad band on the feathers a'nd extending on the 

 flanks; gray feathers of the wing coverts edged with pale rusty; some of 

 the feathers on base of crown edged with rufous; back with broad black 

 bands on the feathers extending nearly to the nape; inner web of outer 

 rectrix as in adult, except tips, this and other rectrices washed with 

 rufous; white spots on outer webs of outer primaries as in the adult. 

 (Young male) Wing, 158; tail, 125 mm. 



Distinguishing characters: The short wing combined with the 

 vinaceous cinnamon back will distinguish C. s. brevipennis from other 

 races. 



Specimens examined: Curacao I., 7 <?, 5 9 ; Aruba I., 2 d" , 29. 



