Apus Apus (p. 397), synonyms (some archaic, regional, German): Common Swift, Mauersegler, Thurmsegler, Mauerhäkler, Mauerschwalbe, Thurmschwalbe, Steinschwalbe, Geierschwalbe, Feuerschwalbe, and Spyrschwalbe, as well as various Latin names (Cypselus apus, muriarius, barbatus, vulgaris, dubius, turrium, Hirundo apus, Brachypus murarius).
Falfia Negra.

The following excerpt is tranlated from:

Brehms Thierleben, allgemeine Kunde des Thierreichs
(Brehms The Live of Animals, General Description of the Animal Kingdom)
By Alfred Edmund Brehm, Ernst Ludwig Taschenberg, Schmidt (Eduard Oskar)
Published 1882

p. 387

The swifts in the narrower sense (Cypselus) show the characteristics of the family. They are distinguished from their relatives in that the first primary feather is equal in length to the second, or is just barely longer, in that the tail is barely to moderatly forked, and in that the feet are strong and covered by feathers on the front side and naked on the back side.

Two species of the genus live in Europe, both occurring in Germany - one occurs everywhere and the other in the southern mountain areas. The latter is among the largest in the family and for this reason deserves to be mentioned first.

The Alpine Swift also goes by the names of Felsensegler, Bergspyr, Münsterspyr, Alpenhäkler, Alpenschwalbe, Bergschwalbe or Gibraltarschwalbe, as well as various other names (Cypselus melba, alpinus, gutturalis, gularis, and Layardi, Hirundo melba and alpina, apus and Micropus melba). It reaches a length of 22 centimeters, a span of 55 to 56 centimeters; the primary feather length is 20 centimeters and the length of the tail is 8.5 centimeters. All upper parts, the sides of the head and the lower tail cover have a dark smoky coloration, and the feathers have steely brownish rims. An extended area on the chin and throat, as well the breast, belly and bottom area are white, so that only a brown band is visible on the breast, covering the area between the side of the beak and narrowing in the center. The primaries are of a darker brownish black color than the feathers on the upper side of the body and are characterized by a clear irridescent shimmer. Their underside are of a shiny brown color like the primaries. The eyes are dark brown, the beak is black, as are the naked parts of the feet.

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p. 397
The Alpine Swift also goes by the names of Felsensegler, Bergspyr, Münsterspyr, Alpenhäkler, Alpenschwalbe, Bergschwalbe or Gibraltarschwalbe, as well as various other names (Cypselus melba, alpinus, gutturalis, gularis, and Layardi, Hirundo melba and alpina, apus and Micropus melba). It reaches a length of 22 centimeters, a span of 55 to 56 centimeters; the primary feather length is 20 centimeters and the length of the tail is 8.5 centimeters.

The Common Swift, the relative of the Alpine Swift repeatedly mentioned on the previous pages, also goes by the names of Mauersegler, Thurmsegler, Mauerhäkler, Mauerschwalbe, Thurmschwalbe, Steinschwalbe, Geierschwalbe, Feuerschwalbe, and Spyrschwalbe (Cypselus apus, muriarius, barbatus, vulgaris, dubius, turrium, Hirundo apus, Brachypus murarius). It reaches a length of eighteen and a span of fourty centimeters. ….
…translation into English to be continued…