PETROCHELIDON RUFICOLLARIS {Peak).
PERUVIAN CLIFF-SIVALLOW.
B in n d o ruficollaris, Peak, U.S. Explor. Exped.. Birds, p. 175 (1818) ; Gray,
Hand-1. B. i. p. 71, no. 839 (1869).
Petrochelidon fiulea, juT., Cass. U.S. Expl. Exped., Birds, p. 181 (1858).
Petrochelidon ruficollaris, Baird. Review Amer, B. p. 293 (1866) ; Salvin and
Godman, Biol. Centr.-Amer., Aves, i. p. 235 (1883); Sharpe, Cat. Birds in Brit
Mas. X. pp. 106, 636, pl. iii. (1885) ; Tacz. Orn. du Pérou, iii. App. p. 503 (1886).
Petrochelidon ruficollis. Nation, P.Z. S. 1885, p. 277.
P . u ro p y g io ru fo ; g u là a lb id â j to rq u e p ræ p e c to ra li ru fà , a u ric u la rib u s concolore.
H a b . in P e ru v iâ .
A d u li male. G en e ra l co lo u r above d u ll p u rp lis h b lu e , s tre a k e d o n th e m a n tle a n d b a ck w ith g rey ish -
w h ite edges to tb e fe a th e rs ; low e r h a c k a n d rum p p a le c h e s tn u t ; s c ap u la rs lik e th e b a ck ; wing-
co v e rts a n d quills b row n , w ith a sh y m a rg in s to th e se co n d a rie s ; u p p e r ta il-c o v e rts pa le b rown,
w ith a sh y -w h itish edge s to th e o u te r o n e s ; ta il-fe a th e rs d u sk y b rown, p a le r b rown tow a rd s th e
ends o f th e in n e r webs j crow n o f h e ad p u rp lish blue , s e p a ra te d from th e b a c k b y a co lla r o f
sm o k y b rown, base o f fo reh e ad d u ll c h e s tn u t ; e a r-co v e rts a n d ch e ek s a sh y w h ite , th e fo rm e r
po s te rio rly m a rk e d w ith l ig h t ch e s tn u t, which e x te n d s ba ckwa rds a n d fo rm s a p a tc h o n th e sides
o f th e h in d e r crown ; th ro a t a shy w h ite ; fore n e c k a n d c h e s t pa le c h e s tn u t, w ith a p a tc h o f smoky
b row n o n th e sides o f th e u p p e r b r e a s t j c e n tre o f h r c a s t a n d ab d om en w h ite , th e flanks aud ven t
wa shed w ith p a le c h e s tn u t ; u n d e r ta il-c o v e rts pa le b row n , b ro a d ly e d g ed w ith w h ite , p ro d u c in g
a m o ttle d a p p e a ra n c e ; ax illa rie s a n d u n d e r w in g -co v e rts u n ifo rm sm o k y b row n ; q uills dusky
b row n below, more a sby a lo n g th e edge o f t h e in n e r web. T o ta l le n g th 4 '8 in ch e s, c u lm eu 0-35,
wing 3 '8 , ta il 1‘9 , ta rsu s 0-45.
Young. M u ch d u lle r in c o lo u r th a n th e a d u l t ; a n d d istin g u ish ed b y th e n a rrow a shy m a rg in s to
th e fe a th e rs o f th e u p p e r su rfa c e , th e win g -co v e rts, se co n d a rie s, a n d ta il-fe a th e rs b e in g edged
w ith p a le c h e s tn u t ; lowe r b a c k a n d rum p p a le r c h e s tn u t th a u in th e a d u l t ; u p p e r ta il-c o v c rts
edged w ith ru fo u s ; th ro a t washed with ru fo u s ; c h e s tn u t b a n d o n b re a s t less pro n o u n c ed ; flauks
smoky b rown washed w ith p a le ru fo u s. T o ta l len g th 4 '6 in ch e s, c u lm cn 0 3 , w ing 3 4 5 , ta il 1-9,
ta rsu s 0 4 .
T h e original specimen o f this species was discovered by M r Peale near Callao, in Peru,
during the voyage of the United States Exploring Expedition. Mr. Cassin afterwards
united Peale’s species to the Central-American P . fu lm , of which he considered it to be
the immature bird. Professor Baird, however, in 18G5, reinstated the Peruvian bird as
o