92 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



[Hirundo'] albilinea Sclateb and Saivin, Nom. Av. Neotr., 1873, 14. 



Tachycineta albilinea Laweence, Mem. Boat. Soc. N. H., ii, 1874, 271 (Mazatlan, 

 resident; habits). — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1883, 

 235 (Belize E. and coast cays, British Honduras; Peten, Yaxha, Rio Dulce, 

 Huamuchal, Chiapam, and San Jos6, Guatemala; La Union, Salvador; 

 Amapala, Honduras; Corinto, Nicaragua; Matachin, Isthmus Panama, etc.). — 

 Nutting, Proc. U. S. Nat. Mus., vi, 1884, 392 (Ometepe, Nicaragua).— 

 Shaepe, Cat. Birds Brit. Mus. , x, 1885, 115, 631 (Vera Cruz, Mexico; Belize E., 

 British Honduras; Chiapam, Guatemala; Punta Arenas, Costa Eica; Panama 

 and Lion Hill, Panama, E. E.; Chepen, Peru) .— Zeledon, Anal. Mus. Nac. 

 Costa Eica, i, 1887, 107 (Costa Eica).— Eichmond, Proc. U. S. Nat. Mus., • 

 xvi, 1893, 486 (Eio Frio, Costa Eica). — Shaepe and Wyatt, Mon. Hirund., 

 1894, 149, 188, pi. 22.— Bangs, Auk, xviii, 1901, 368 (David, Chiriqui). 



Tlachycineta] albilinea Eidgway, Man. N. Am. Birds, 1887, 462. 



[Hirundo'] albilineata Geay, Hand-list, 1, 1869, 71, no. 845. 



Petroehelidon littorea Salvin, Proc. Zool. Soc. Lond., 1863, 189 (Belize Eiver, 

 British Honduras; colL Salvin and Godman)." 



Hirundo leucopygia (not H. leucopyga Meyen) Taczanowski, 6 Proc. Zool. Soc. 

 Lond., 1880, 192 (Chepen, n. Peru, alt. 400 ft.); Orn. du P6rou, i, 1884, 240. 



Genus TACHYCINETA Cabanis. 



Tachycineta" Cabanis, Mus. Hein., 1, 1850, 48. (Type, Hirundo tkalasdna 

 Swainson. ) 



Small or medium-sized HirundinidsB (wing, 99-125 mm.) with narrow, 

 operculate nostrils opening laterally; frontal feathers not reaching to 

 anterior end of nostrils; tail about two-fifths as long as wing, forked 

 for about one-fifth its length; lateral toes, relatively short and weak, 

 their claws falling decidedly short of base of middle claw; upper parts 

 soft (not glossy) green, bronze, and violet, under parts and sides of 

 head white. 



Bill small, weak and much depressed, its width at frontal antiae about 

 equal to length of exposed culmen, the latter nearly equal to distance 

 from nostril to eye; culmen nearly straight for basal half, then grad- 

 ually decurved, the tip of the maxilla narrowly and distinctly unci- 

 nate; maxillary tomium straight, its subterminal notch distinct. Nos- 

 tril opening laterally, longitudinal, narrowly ovate-elliptical, over- 

 hung by a broad membraneous operculum, the feathering of frontal 

 antise extending forward about as far as middle of nostrils. Rictal 

 bristles distinct, extending decidedly beyond edge of maxillary tomium. 

 Tail much less than half as long as wing, emarginate, the depth of 

 emargination about one-fifth its total length, the lateral rectrices broad 

 to near end, where the inner web is rather abruptly contracted, the 

 tip obtusely pointed. Tarsus longer than middle toe (without claw), 

 the upper portion feathered in front and on sides, the feathering on 



a According to Sharpe, Cat. Birds Brit. Mus., x, 1885, 631. 

 6 Described as a new species, from Stolzmann's manuscript. 

 " "Von raxvKivjjTOi sich schnell bewegend." 



