612 : MR. P. L. SCLATER ON THE [June 27, 
Natterer obtained specimens of this Swift (sp. no. 96) at Rio 
Janeiro (December and July), Engenho do Cap Gama (September), 
Resacea (November), Ypanema (February), Yturaré (February ), 
Borda do Matto (November), and Trisauga (February). 
9. CHATURA CINEREIVENTRIS. 
Cypselus acutus, Max. Beitr. iii. p. 351 (nec auct.). 
Acanthylis spinicauda, Burm. Syst. Ueb. ii. p. 366. 
Chetura cinereiventris, Sclater, Cat. Am. B. p. 283, et P. Z. S. 
1863, p. 101, pl. xrv. f. 1. : 
Aineo-nigra ; uropygio et corpore subtus cinereis; crisso nigri- 
eante: long. tota 4°3, ale 4°2, caude 2°8. 
Hah. South-eastern Brazil. 
Mus. Bo sss? 
The cinereous uropygium and body beneath render this Brazilian 
bird very easily recognizable on comparison with its congeners, though 
it has been hitherto always confounded with one or other of them. 
Two examples of this species in the Leyden Museum are marked 
C. spinicauda, while the same name is more correctly applied to a 
third specimen belonging to the next species. 
Natterer obtained examples of this species (his no. 97) at Rio 
Janeiro (December), Marambaya (March), Registre do Sai (April), 
and Borba (July). 
Natterer’s remarks (as kindly communicated to me by Herr v. 
Pelzeln) concerning this species are as follows :— 
** Borba, July 8th, 1830.—Just before sunset almost every day a 
pretty large flock of this Swift sweeps with extraordinary rapidity 
over the village. In the winter menths (from December to March) 
the Puriti Swifts* sweep over the village in the afternoon, but they 
do not fly so swiftly as the present bird, which comes in later in the 
evening, and flies at a higher elevation. There have been now no 
Puriti Swifts to be seen here for several months.” 
10. CHa&TURA SPINICAUDA. 
Cypselus spinicaudus, Temm. Tabl. Méth. p. 78 (ex Buff. Pl. Enl. 
726. f. 1). 
Hirundo pelasgia, var., Lath. Ind. Orn. ii. p. 581. 
Acanthylis spinicauda, Boie, Isis, 1826, p. 971; Bp. Consp. p. 64. 
Chetura spinicauda, Sclater, Cat. Am. B. p. 283, et P. Z. 8. 1863, 
p- 101. 
Nigra; fascia uropygiali alba ; subtus albicanti-fuliginosa, pec- 
tore indistincte nigro vittato: long. 3°7, ale 3°9, caude 1°6. 
Hab. Cayenne. 
Mus. P. L. 8. ‘ 
I have little doubt that this bird is the true ‘ Hirondelle a queue 
pointue de Cayenne”’ of Buffon. It is easily distinguishable from 
all the others by the white band across the rump. I have two 
examples, both from Cayenne. Such being the case, it is entitled 
* Cypselus squamatus, Cassin, antea p. 605. 
