FAMILY FRINGILLIDAE 



607 



AM MOD RAMUS SAVANNARUM PRATENSIS (Vieillot) 



Passerina pratensis Vieillot, 1817, Nouv. Diet. Hist. Nat., nouv. ed., 25, p. 24. 

 (New York.) 



Characters. — Separated from all resident populations in Middle 

 America by its greater wing length; darker and more richly colored 

 than the birds of western North America, A. s. per pallidus Coues. 



M easurements. — Males ( 10 from the breeding range, taken in May) , 

 wing 61.0-66.0 (62.9), tail 41.3-47.6 (45.9), culmen from base 11.5- 

 13.3 (12.5), tarsus 16.2-20.1 (18.7) mm. 



Females (10 from the breeding range, taken in April, May, and 

 June), wing 58.7-63.5 (61.4), tail 41.5-49.5 (44.7), culmen from base 

 11.5-13.0 (12.2), tarsus 18.4-20.0 (19.2) mm. 



Migrant. Known only from Almirante, Bocas del Toro, where an 

 unsexed adult specimen was taken in November 1963 by personnel of 

 the Gorgas Memorial Laboratory (USNM no. 533402) (Olson, 1980, 

 Proc. Biol. Soc. Wash. 93(3), p. 757). This specimen marks a signifi- 

 cant range extension, the southernmost occurence of the subspecies 

 heretofore being in Belize (British Honduras) . Ridgely ( 1976, p. 339) 

 mentions a specimen of this species that was captured and released, 

 also at Almirante, on November 4, 1967. He suggests that this was 

 probably a migrant, which seems likely in view of the identity of the 

 above specimen and the general lack of sufficient habitat in the Almi- 

 rante area to sustain a breeding population of this species. 



AM MOD RAMUS SAVANNARUM BIMACULATUS Swainson 



Ammodramtis bimaculatus Swainson, 1827, Philos. Mag., new ser., 1, p. 435. 

 (Temiscaltepec, Mexico, Mexico.) 



Characters. — Streaking in nape reddish rather than brownish black 

 as in A. s. caucae of northern Colombia. Darker and more richly 

 colored than beatriceae. 



Measurements. — Males (10 from Panama, Costa Rica, and Mex- 

 ico), wing 54.6-60.0 (57.6), tail 38.7-45.3 (42.1), culmen from base 

 11.0-13.2 (12.0, average of 9), tarsus 17.3-20.1 (18.6) mm. 



Females (2 from Panama), wing 56.0-56.5 (56.3), tail 38.4-39.0 

 (38.7), culmen from base 11.6-13.0 (12.3), tarsus 18.0-18.7 (18.4) 

 mm. 



Resident. Uncommon and very local in the lowlands of western 

 Chiriqui (4 specimens, now in the American Museum of Natural His- 

 tory, were taken at Frances by H. J. Watson in 1905) and eastern Prov- 

 ince of Panama around Chepo, where E. A. Goldman collected 3 in 



