^°19^S^^1 Riley, The Broad-winged Hawks of the West Indies. 



275 



Another immature female, taken by Mr. Branch at the same time and 

 place (U. S. National Museum, No. 191127), is darker on the back, the 

 feathers more hea\'ily edged \\ith cinnamon-rufous; the markings below 

 are slightly more nmnerous, and the tail is of a different pattern. The 

 middle feathers are without bais except for the dark subtenninal band; 

 the other feathers of the tail are not essentially different from No. 191126, 

 described above, except that the bars are obsolete on the outer web, and 

 on the inner web of the pair next the middle feathers the bars become 

 obsolete towards the base, being broken up into fine spots and stippling. 

 The tail when closed is almost plain dark hair brown, tipped with lighter 

 brown, and with a subterminal dark band, the extreme base white, stip- 

 pled with bro-wn. 



A third immature female obtained on the same island by Mr. Branch 

 (U. S. National Museum, No. 191128, Nov. 26, 1903), is darker than either 

 of the specimens just described, and differs in the pattern of the tail, which 

 is similar to that of the adult. Below, it has begun to acquire a few russet 

 streaks on the chest; the thighs are almost without markings, but other- 

 wise it is not essentially different from the other two. 



Remarks. — In a large series of immature specimens of Buteo p. 

 platypterus from various parts of its range, and of B. p. antillarum 

 from St. Vincent, Grenada, and Tobago, and of B. p. rivierei from 

 Dominica, I am unable to find anything approaching the three 

 specimens above described. 



The adult is much lighter and smaller than B. p. antillarum, and 

 the bars below are narrower and less sharply defined. It is cer- 

 tainly a well-marked insular race, not coming into close contact 

 with any of its relatives on the north or south. 



The following table of measurements gives the averages in milli- 

 meters, for comparison. I have discarded a number of measure- 

 ments where the sex was apparently incorrectly determined. 



Males: 



Wing. 



Tail. 



Cul- 

 men 

 from 

 cere. 



iTar- 



[sus. 



Middle- 

 toe. 



4 adults from eastern U. S. . . . 



2 adults (unsexed) from Costa Rica 



3 adults from Cuba 



4 examples from St. Vincent '■ . . 

 2 adults from Dominica .... 



1 adult from Antigua 



18 



182 



18.8 



18.1 



19.2 



18.7 



62.5 



61 



58.3 



54.7 



59.2 



57.7 



33.1 



33.2 



32.3 



30.8 



31 



31 



1 3 fully grown, but in immature plumage. 



2 One specimen. 



