SWIFT.
CYPSELUS APUS {Linn.).
Hirundo apus, Linn. S. N. i. p. 344 (1766).
Cypselus apus, Naum. vi. p. 123; Yarr. ed. 4, ii. p. 364;
Dresser, iv. p. 583.
Cypselus murarius, Macg. iii. p. 614; Hewitson, i. p. 267.
Martinet de muraille, French; Thurmsegler, German;
Avion, Vencejo, Spanish.
A more or less common summer visitor to all parts
of the British Islands.