370 CYPSELIDZ. 
Authentic information concerning the migration of this species, if any, is also very 
deficient. The presence of birds in countries north of Mexico has been recorded 
between the months of February and September, and in December at San Bernardino 
in Southern California; and Dr. Cooper believed * that they winter in the cafions of 
the Colorado river ; but this appeared improbable to Dr. Coues, who was inclined to 
look upon the Guatemala individuals as birds in their winter-quarters. So far as our 
own experience goes we are satisfied that the Guacalate colony is resident throughout 
the year, whatever the movements of the northern birds may be. 
PANYPTILA. 
Panyptila, Cahanis in Wiegm. Arch. fiir Naturgesch. 1847, xi. p. 8345; Hartert, Cat. Birds Brit. 
Mus. xvi. p. 461. 
Prof. Cabanis separated this genus from Cypselus in 1847 in his well-known paper 
on the Classification of Birds, and made P. cayennensis the type. 
Panyptila can be readily distinguished from Cypselus by the feathering of the toes 
from the end of the tarso-metatarsus to the base of the claws. Its nidification also is 
very different from .that of Cypselus, as it constructs a large pendent nest of silky seeds 
which it glues to the under surface of an overhanging rock, Cypse/us resorting to 
crevices and caves in rocks or roofs of buildings. From Aéronautes, Panyptila differs 
in its more deeply forked tail, the outer rectrices being considerably the longest and 
very pointed ; the first primary, too, is as long as, instead of shorter than, the second 
and also sharply pointed. 
Only two species are contained in the genus, of which P. cayennensis has a wide 
range over Tropical America and just enters our fauna in the State of Panama. The 
other, P. sancti-hieronymi, so far as we know at present, is confined to Guatemala. 
1. Panyptila cayennensis. 
Le Martinet a collier blanc, D’Aub. Pl. Enl. p. 725. fig. 27. 
Hirundo cayennensis, Gm. Syst. Nat. i. p. 1024°. 
Panyptila cayennensis, Cab. in Wiegm. Arch. f. Naturg. 1847, xiii. p. 345°; Layard, Ibis, 1873, 
p. 389°; Salv. Ibis, 1885, p. 436°; W. L. Scl. Ibis, 1887, p- 318°. 
Panyptila cayanensis, Scl. P. Z. 8. 1865, p. 6067; Scl. & Salv. P. Z. S. 1879, p. 531°; Hartert, 
Cat. Birds Brit. Mus. xvi. p. 461°. 
Velutino-nigra, macula supra lorali, torque cervicali, gutture toto, macula utrinque hypochondriali et rectri- 
cibus externis in pogonio externo ad basin pure albis; secundariis ad apicem et primariis internis in 
pogonio interno (stricte) albo marginatis ; alarum margine externo et campterio fusco variegatis: rostro 
nigro, unguibus fuscis. Long. tota circa 5:6, ale 5:0, caudex rectr. med. 1-1, rectr. lat. 2:2. (Descer. 
maris ex Samiria, E. Peru. Mus. nostr.) . 
Hab. Panama, Rio Chagres (Merritt).—Soura America generally from Colombia® and 
Venezuela® to Guiana! 5°, the Amazons Valley 4, and South-east Brazil ®. 
Though well known for more than a century, this species is still somewhat rarely 
represented in collections, due most probably to the difficulty of securing specimens of 
