328 XOllTII AMERICAN J5IHDS. 



diagnosis will show the ivlatiousliip of the several forms usuully recognizod 

 as distinct species : — 



Species and Varieties. 



P. Bubis. Above lustroius liliiu-black ; beiioiilli lustrous bluo-black or lirown- 

 ish-frniy, unifoiin, or witli the iibiluuu'U and ciissum wliilu, or whitish. Femules 

 always with tlio throat anil jufrulum i^vny. 



A. Adult males entirely steel-blue. 



a. Females and younjj males with the abdomen pure whit(!. 



Feathers (ihout the iiiiits .imokii-f/ni)/ beneath the surface. 



Wing about 0.00; I'ork of tail, .80 deej). 9 and Jiw. Abdominal and 

 crissal leathers always with dusky sliai'ts, and with the eoncealed por- 

 tion grayish. Fori'head and nape hoary grayish. Jlah. Continental 

 North America, south into Northern Mexico .... x-M.siihin. 



Wing, 5.25; fork of tail considerably less. 9 and ./nv. unknown. 

 Hub. Galapagos var. concolor} 



Wing, 5.80; fork of tail. 1.10 <lee|). 9 and Jitv. unknown. Hub. 

 Chih \av. fiircuta." 



Feathers about the anus snoinj-white beneath the siirfare. 



Wing, 5.50; fork of tail, .00 deep. 9 and juv. Abdominal and cris- 

 sal feathers entirely snowy-white, — never with dusky sharts (except 

 $ juv. in transition). Forehead dusky grayish-brown; nape steel- 

 blue. //((6. Cuba and Florida Keys .... \M:cryptoleuca. 

 h. Females and young with the abdomen dusky gr.iyi.sh-brown. 



Wing, 5.50; fork of tail, .80. 9. Lower parts dusky grayish-brown, 

 the feathers boidere<l with lighter grayish, producing a squamate a])- 

 pcarance. Jm. similar, but feathers of the upper parts bordered with 

 whitish, //ai. Paraguay (Vermejo River) . ■ \m: eletja n s:' 



B. Adidt males with the abdomen and crissmn imre white. 



a. Lower tail-coverts with the shafts pm-e white. $ (adult) with the 

 throat, jugulum, and sides steel-blue. 



9 and juv. scarcely <listingnishable from those of criipioleuca. Hub. 

 Porto Kii'o and Jamaica (St. Domingo also ?) , . var. dominicensis.* 



b. Lower tail-coverts with their shafts dusky. $ (adult) with throat, jugu- 

 lum, and .'jides brownish-gray. 



Sides of the jugiilnm with a bluo-black patch in the $. Wing, 5..'i0 ; 

 fork of tail, .70 deep. VM. Bolivia .... \m: domestica .^ 



1 Prnijne suhis, vnr. cnm-olor. Ilirumlo concolor, OoHM), P. Z. S. 1837, 22 (James I., Cala- 

 pagos). rrorine c. llAllili, Rev. Am. 15. ISO'., 278. Profjiie. modesta, UoL'l.n, Birds BeagUs 3i), 

 pi. V. (Same s]ieeimi'n.) 



^ Progne suliis, yar. f 11 rcntii. Proline furcalu, B.UUI), Hev. Am. 11. 18(55, 278. (Chile.) 



» Profine subu, var. elnjans. Proijn,: tlctjittis, Baikd, Kev. Am. H. 18(5r), 275. (Verniejo 

 River. .? Prognc purpurea, Darwin, H. Beagle 38 (Montevideo, November), Baliia Bknca, 

 Buenos Ayris, Sej)tend)cr.) 



* Prognc (subis var?) domimCKrt.iis. Hirwido doitiim'ren.ih, CrM. S. N. I, 1788, 1025. Proijne 

 d, Mauch, p. A. N. S. 1803, 295; Baiup, lU'v. Am. B. 18(i,5, 279. 



6 Pro'im (suliis var?) domc.stica. Pmgnc domestica (ViKiix.) Baiud, Rev. Am. B. 1800, 282. 

 (Paraguay and Bolivia.) (llirundo domestica, Vilin.i,. Nouv. Diet, xiv, 1817, 521.) 



