202 AVKS: PASSERES. — XLVl. 



the world. All an* stronfj on the winjj, inscctivorou!:, and in our 

 latitude niij^ratory. (Lat., hirundo, swallow.) 



a. Nostrils opeuiug directly upward, with very little membrane bordering 

 inner edge. 

 b. Tail forked for a distance more than half tar.sus; bill very stout, curved, 



(plumage lustrou.<, <f all black) Pkogne, 498. 



U>. Tail even. 



c. Outer web of outer primary without recurved hooks; (plumage lustrous). 



I'etuociiki.iihin. 4'J9. 

 cc. Outer web of outer primary with stiff recurved hooks, obscure in 9 ! 



(plun)age jdain l)rown.) Stei,<;ii>oitki{yx, 503. 



aa. Nostril opening laterally, and bordered above by a broad membrane or 

 overhanging scale. 

 d. Tail forked for more than half its length, the outer feathers very 



narrow toward tip; no tarsal tuft Hikl'ndo, 500. 



dd. Tail forked for less than half its length. 

 e. Tarsus without tuft of feathers on its lower part: (plumage lus- 

 trous) TACIIVriNKTA, 501. 



ee. Tarsus with a small tuft of feathers on its lower part; (plumage 

 ])lain brownish). . . Kii-akia, 502. 



498. PROGNE l>oie. (UpoKin]. a cliarat'ter in niytholofry, turned 

 into a swallow.) 



941. P. subis (1..). IMiu'i.E Mahtix. Lustrous blue-hlack 

 throufihout ; 9 duiiiT, whitish and streaky below. L. 7^. W. G. 

 T. .'^J. N. Am., ahundanf. (Lat., old name of some hird.) 



499. PETROCHELIDON C':d)anis. (nerpa, rock; ^fXtSwi/.) 



942. P. lunifrona (>^ay). Ci.iff 8\v.\llo\v. Lustrous steel 

 blue; forel)e:id, sides of head, throat, rump, etc., of various shades 

 of ehestnut ; a blue spot on breast ; belly whitish. L. 5^. W. 4^. 

 T. 2|. N. Am., abundant, formerly nesting in cliffs, but now 

 buildi!i<? under the eaves of barns. (Lat., luna, moon ; frons, 

 forehead.) 



500. HIRUNDO l.inn.Tiis. (Lat., swallow.) 



94.3. H. erythrogaster P.oddiiert. Rai:n Swallow. Lus- 

 trous steel-blue, Imffy Ix-low ; forehead and throat deep chestnut ; 

 an imperfect steel-blue collar; tail feathers with white s])ots. L. 7. 

 W. 5. T. 4^. N. Am., very abundant ; breeding in colonies about 

 barns, etc. (Or., red-ln-lly.) 



501. TACHYCINETA Cabanis. (raxvKiinrros, moving swiftly.) 



a. Ear coverts steel-blue; ujuht parts with metallic lustre. {Iridoprocne 

 Coues. ) 



944. T. bicolor (Vicillot). Wiiite-hklliki) Swallow. Lus- 

 trous bliu-^nin. |Mirc white lu-low ; 9 duller. L. (jj. W. 5. T. 2J. 

 N. Am., abundant al)out water; very handsome. 



