130 KORTII AMEIUCAX BIRDS. 



tarsus, 1.50-1.60; middle toe, 1.75-2.10. Second quill lon5:est; 

 first longer than third. Crissum ochraceous, or \^-hite and rufous, with 

 laige transverse spots of black ; upper tail-coverts sharply barred witli 

 pure white or pale ash. Adult. Above plumbeous-black, the feathers 

 conspicuously bordered with plumbeous-blue. Throat and jufruluni 

 immaculate; white centrally and anteriorly, deep riilbus laterally and 

 posteriorly. Tibiie plain rufous. Young. Above uniform dull black, 

 the feathers sometimes bordered inconspicuously with rusty. Throat 

 and jugulum varying from white to ochraceous or rufous (this always 

 deepest laterally and posteriorly). Tibial soinetimes thickly spotted 

 transversely with lilack. Hah. Tropical America, north to Southern 

 Mexico. 

 3. F. rufigularis.' Wing, 7.20 - 9.00 ( (J, wing, 7.70 ; tail, 3.95-5.50 ; 



transverse spots of black ; inner webs of primaries with transverse ovate spots of wliite, touching 

 neither shaft nor edge of the feather ; these number seven on the longest ijuill (seconil). Wiiig- 

 formida, 2-1, 3-4. Wing, 9.90 ; tail, 5.50 ; tarsus, 1.55 ; middle toe, 1.75. 



Juv. {^, 51,293, Costa Kiea, La Pahna, August 25, 1S67 ; Jose C. Zeledon). Whole upper 

 surface black, deepest on the tail ; it occupies the whole liead (except the chin, throat, and 

 sides of the neck), the black cheek -patch having considerable prominence ; feathers evei-y where 

 (except on the head and neck) indistinctly bordered with light brownish, this becoming more 

 distinct posteriorly ; u]iper tail-coverts tipped and barred beneath the surface with pure white ; 

 secondaries, primaries, and primary coverts narrowly but sharph' tip|>ed with pure white ; tail 

 ci'ossed w^ith five very sharp bars of pure white, the last terminal, the iirst two concealeil by the 

 coverts ; these transverse spots touch the sliaft, but not tlu- edge of the feather ; on the lateral 

 feather they are confined to the inner web. Chin, throat, neck, and breast, abdomen, crissum, 

 and lower tail-coverts, deep orange (not chestnut) rufous ; in fact, this forms the ground-color of 

 the whole lower parts ; but the sides, flanks, and abdomen have such large transverse spots of 

 black (these exceeding tlie orange in amount), giving the prevailing color ; the orange of the 

 jugulum is sharply defined, with a semicircular outline, against the black of the belly, and has 

 distinct lanceolate shaft-streaks of black ; the lower part of the abdomen, and the tibise, 

 have cordate or broadly sagittate black spots, rather exceeding the orange ; the lower tail- 

 coverts liave broad transverse spots of black. (The orange is deepest on tlie jugulum and 

 cri.ssum, being palest where most tliickly spotted ; it is immaculate only on chin, throat, and 

 neck ; the markings are longitudinal only on the jugidum.) Lining of the wing like the 

 belly, tliat is, the black predominating ; under surface of primaries with transverse elliptical 

 spots of pale cream-color, seven in number on the longest. Wing-formula, 2, 1-3. Wing, 

 9.90 ; tail, 5.40 ; cuhnen, .72 ; tarsus, 1.40 ; middle toe, 1.75 ; outer toe, 1.20 ; inner, 1.00 ; 

 posterior, .80. 



List of Specimens examined. — National lluseum, 1 ; 0. N. 1-awrence, 1; Boston Society, 

 2 ; Philadelphia Academy, 3. Total, 7. 



Mcasurcmenls. — ?. Wing, 10.90-11.30 ; tail, 6.00- 6.25 ; cidmen, .90 ; tarsus, 1.50-1.60; 

 middle toe, 1.85 - 2.10. 



1 Falco nifgnlaru:, Baud. Tr. Orn. II, 131, 1800. — Stuicicl. Orn. Syn. I, 88, 1855. Hypo- 

 Iriorchis riifKjularis, Gray, Gen. B. fob sp. 5, 1844 ; List B. Brit. JIus. p. 54, 1848 ; Hand 

 List, I, 21, 1869. — P.0NAI'. Consp. Av. (sub F. aurantius.). — Gkay, Hand List, I, 21, 1809. 

 Fiilco aurantius, /3, Lath. Ind. Orn. I, 48, 1790. Falcn axirantius, y. Lath. Ind. Orn. I, 48, 

 1790. Faho aurantius, TiCM.M. I'l. Col. s\d). pi. cccxlviii, 1836. —Light. A^erz. Doubl. p. Gl, 

 1823. — Cass. B. N. Am. 1858, 10. — Elliot, Buds N. Am. pi. xi. Falco nlbigularis, Dald. 

 Tr. Orn. II, 13:, 1800. Falco' hwmorrhoidaUs, Hahn, Vbg. XV, Lief. pi. i, 1818. Falco cuculla- 

 tus, Swains. An. Menag. p. 340, 1838. Falco thoracicus, Doxovan, Nat. Kep. pi. -xlv, 1822. 



Sp. Chau. Adult (g, 52,820, Mazatlau, Western Mexico ; Col. A. J. Grayson). Above 

 dark slate, with a bluish-plumlwous cast, and uniform over whole surface (wings included) from 

 nape to tail. Anteiiorly the tint is almost black, this covering contiiuiously the whole upper 

 and lateral |)Ortion of tlie lu'ad, reaching down to the throat, and furuuu^ a broad angular pro- 



