754 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Bubo virginianus mayensis Nelson, Proc. Biol. Soc. Wash., xlv, Sept. 25, 1901, 



170 (Chichen Itza, Yucatan; coll. U. S. Nat. Mus.). 

 Bubo magellanicus mayensis Bangs, Proc. Biol. Soc. Wash., xxi, 1908, 44 (Manatee 



District, Brit. Honduras; crit.). 

 Asio magellanicus mayensis Oberholser, Proc. U. S. Nat. Mus., xxvii, Jan. 22, 



1904, 181 (monogr.). 



BUBO VIRGINIANUS MESEMBRINUS (Oberholser). 



COSTA RICAN HORNED OWL. 



Similar in coloration to more fulvescent examples of B. v. virgini- 

 anus but tlie tawny color intensified (more rufescent) and more preva- 

 lent, and size decidedly less. 



Adult female. — Wing, 340; tail, 198; ciilmen (from cere), 29." 

 Costa Rica (San Jose) ; western Panama (Chitra, Veragua) . 



Bubo virginianus (not Strix virginiana Gmelin) Lawrence, Ann. Lye. N. Y., ix, 

 1868, 132 (San Jose, Costa Rica).— Frantzius, Journ. fur Orn., 1869, 366 

 (Costa Rica). — Salvin, Proc. Zool. Soc. Lond., 1870, 216 (Chitra, Veragua).— 

 Zeled6n, Anal. Mus. Nac. C. R., i, 1887, 125 (Costa Rica). — Salvin and 

 GoDMAN, Biol. Centr.-Am., Aves, iii, 1897, 12, part (San Jose, Costa Rica; 

 Chitra, Veragua). 



Bubo virginianus, var. virginianus Ridgway, in Baird, Brewer, and Ridgway, 

 Hist. N. Am. Birds, iii, 1874, 62, part (San Jose, Costa Rica; crit.). 



Asio magellanicus mesembrinus Oberholser, Proc. U. S. Nat. Mus., xxvii, Jan. 

 22,-1904, 179 (San Jose, Costa Rica; coll. U. S. Nat. Mus.). 



Bubo virginianus mesembrinus Carriker, Ann. Carnegie Mus., vi, Sept. 7, 1910, 

 473 (Costa Rica). 



Genus PULSATRIX Kaup. 



Pulsatrix Kaup, Isis, 1848, 771. (Type, Strix torquata Daudin=AS'. perspidllata 

 Latham.) 



Large Bubonidse (wing about 305-360 mm.) without ear-tufts but 

 with, the ear-conch relatively small, simple, nonoperculat© (the 

 two of opposite sides symmetrical), and with very stout bill and feet, 

 the latter densely feathered at least on basal portion of toes. 



Bill relatively large and very strong; top of cere decidedly shorter 

 than chord of culmen, very broad, very slightly convex or nearly 

 straight. Nostril broadly oval and obliquely vertical, or nearly cir- 

 cular, in upper anterior edge of cere. Wing rather long, the longest 

 primaries exceeding distal secondaries by nearly one-third the total 

 length of wing; sixth and seventh, or fifth, sixth, and seventh, * pri- 

 maries longest, the ninth" intermediate between second and third, <^or 



« One specimen (the type). Adult male not seen. 



b Fifth and sixth, or fifth, sixth, and seventh, from ou-tside, not counting rudimen- 

 tary eleventh primary, 

 c Second from outside. 

 ^ Eighth and ninth from outside. 



