94 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



of bill at frontal antise, 5; tarsus, 11-12 (11.5); middle toe, 10-11 

 (10.6).« 



AdvU female. — Similar to the adult male but much duUer in color; 

 pileum and hindneck varying from bronzy green to bronzy purple; 

 back and scapulars varying from, dull bronzy green to dull bronzy 

 purple (usually the latter), the back becoming green across upper 

 margin; middle line of rump and upper tail-coverts dull green; auricu- 

 lar region and supraorbital spot mottled with gray; otherwise like the 

 adult male, but white of under parts less pure, more or less tinged 

 with pale gray anteriorly; length (skins), 113-123 (118.7); wing, 110- 

 116 (113.3); tail, 46-48.5 (47.2); exposed culmen 6.5-6 (5.7); width of 

 bill at frontal antise, 4-5 (4.3); tarsus, 11-12 (11.7); middle toe, 10-11 

 (10.3)." 



Mexican plateau, north to State of Chihuahua,* south to States of 

 Vera Cruz (Orizaba, etc.), Mexico (Valley of Mexico), and Oaxaca 

 (Mitla).'^ 



Hirundo thalasainus Swainson, Philos. Map., new ser., i, 1827, 366 (Heal del 

 Monte, Hidalgo, Mexico; coll. Bullock Mus. ) ; Isis, 1834, 783. 



Mirundo thalassina Bonaparte, Geog. and Comp. List, 1838, 9, part. — Baird, 

 Review Am. Birds, 1865, 299, part (Mexico; Orizaba, Vera Cruz).^BAiKD, 

 Brewer, and Eidgway, Hist. N. Am. BirdsJ i, 1874, 347, part. 



Hirlundo] thalassina BoiB, Isis, 1844, 171. 



Hlirundo] thalassina Gray, Gen. Birds, i, 1845, 58. 



[^Hirundo] thalassina Gray, Hand-list, i, 1869, 71, no. 841. — Coites, Key N. Am. 

 Birds, 1872, 113, part. — Sclatbr and Salvin, Nom. Av. Neotr., 1873, 14, 

 part. 



Cecropis thalasslnus Lesson, Compl. Buffon, viii, 1837, 499. 



[Herse] thalassina Bonaparte, Consp. Av., i, 1850, 341, part. 



Tlachycinetal thalassina Gabanis, Mus. Hein., i, 1850, 48 (Mexico). — Baird, 

 Brewer, and Bidgway, Hist. N. Am. Birds, i, 1874, 344, part. — Codes, Key 

 N. Am. Birds, 2d ed' 1884, 323, part.— Eidgway, Man. N. Am. Birds, 1887, 

 462, part. 



"Three specimens. 



i" Two specimens from Chihuahua (exact locality unknown) in the collection of 

 the American Museum of Natural History are similar to typical examples from the 

 Valley of Mexico in coloration, but are smaller. Their measurements are as follows: 



Locality. 



Wing. 



Tail. 



posed 

 culmen. 



Width ol 

 bill at 



frontal 

 antise. 



Tarsus. 



Middle 

 toe. 



No. 56766, Am. Mus., male 



No. 56756, Am. Mus., female (labeled male, but un- 

 doubtedly a female 



10.5 



8.5 



" An adult female from Mitla in the Biological Survey collection (no. 143514, U. S. 

 Nat. Mus. ) , collected June 28, agrees with typical T. thalas-iUia in larger size, and green 

 instead of blue or purplish upper tail-coverts, but has the back and scapulars bronze 

 green, without any purplish tinge. * 



