446 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



[Amazilia] cyanura Sclater and Salvin, Nom. Av. Neotr., 1873, 92, part (Nica- 

 ragua). 

 A[mazilia] cyanura Ridgway, Man. N. Am. Birds, 1887, 318, part (Nicaragua); 



Rep. U. S. Nat. Mus. for 1890 (1891), 363, part (Nicaragua; diagnosis, etc.). 

 Amizilis cyanura Oberholser, Proc. Ac. Nat. Sci. Phila., June 2, 1899, 207. 

 Hlemithylaca] cyanura Cabanis and Heine, Mus. Hein., iii, 1860, 38, footnote 



(Realejo). 

 Pyrrhophxna cyanura Gould, Introd. Troch., oct. ed., 1861, 160. — Mulsant and 



Verreaux, Hist. Nat. Ois.-Mouch., i, livr. 4, 1874, 307 (Realejo). 

 [Pyrrhophaena] cyanura Mulsant, Ann. Soc. Linn. Lyon, n. s., xxii, 1876, 206. 

 E[rati7ia] cyanura Heine, Journ. fiir Orn., 1863, 191. 

 Ariana cyanura Mulsant and Verreaux, Classif. Troch., 1866, 36. 

 [Polytmus] cyanurus Gray, Hand-list, i, 1869, 132, no. 1684. 

 Sauccrottia cyanura Eudes-Deslongchamps, Ann. Mus. Caen, i, 1880, 417. 

 S[auc€rottea] cyanura Hartert, Das Tierreich, Troch., 1900, 52, part (Nicaragua). 

 [Saucerottea] cyanura Simon, Cat. Troch., 1897, 13.— Sharpe, Hand-list, ii, 1900, 



107. 

 Amizilis cyanura Oberholser, Proc. Ac. Nat. Sci. Phila., June 2, 1899, 207. 

 Saucerottea cyanura impatiens a Bangs, Proc. Biol. Soc. Wash., xix, July 30, 



1906, 104 (San Pedro de Moj6n, Costa Rica; coll. E. A. and O. Bangs). 

 Sauccrottia ajanura impatiens Carriker, Ann. Carnegie Mus., vi, 1910, 526 



(Costa Rica; crit.). 



SAUCEROTTIA CYANURA GUATEMAL.ffi Dearborn. 



GUATEMALAN BLUE-TAILED HUMMING BIRD. 



Similar to S. c. cyanura, but much darker in color, especially the 

 wings; primaries blue-black instead of violet-dusky; chestnut on 

 basal portion of remiges darker and much more restricted; green of 

 upper parts darker, and blue of tail more violaceous, especially on 

 basal portion of outer webs of rectrices, where the color sometimes 

 inclines to metallic purple, the under tail-coverts almost wholly blue- 

 black or dark steel blue, or else margined with darker grayish or 

 chestnut. 



Adult maZe.— Length (skins), 92-100 (97) ; wing, 53-56 (54.5) ; tail, 

 30-31.5 (30.8); culmen, 18.5-19 (18.8).^ 



Adult female.— Length (skins), 94-100 (97); wing, 50-52 (51); tail, 

 30; culmen, 19.5-20 (19.7).-= 



Pacific slopeof Guatemala (Mazatenango, Suchitepequez ; Patulul;'^ 

 Retalhuleu; Pie de la Cuesta, San Marcos) and Chiapas (Huehuetan). 



Amazilia cyanura (not of Gould) Salvin, Ibis, 1863, 239 (Pacific coast, Guatemala), 

 1866, 195 (Retalhuleu and Mazatenango, Guatemala); Cat. Birds Brit. Mus.; 

 xvi, 1892, 212, 661, part (Retalhuleu and Pie de la Cuesta, Guatemala).— 

 Elliot, Classif. and Synop., Troch., 1879, 223, part (Guatemala).— Salvin and 

 GoDMAN, Biol. Centr.-Am., Aves, ii, 1892, 297, part (Retalhuleu and Maza- 

 tenango, Guatemala).— Boucard, Gen. Hum. Birds, 1895, 206, part (Guate- 

 mala) . 



o I am not able to distinguish the type of S. c. impatiens from Nicaraguan examples 

 of true S. cyanura, except by the very slightly less violaceous blue of the tail, all the 

 characters mentioned in the original description failing to hold good. 



t> Three specimens. 



cTwo specimens. 



^See p. 448, footnote. 



