1865.] GENERA AND SPECIES OF CYPSELID&. 609 
6. Species Americanze (Hemiprocne). 
3. CHZTURA SEMICOLLARIS. 
Acanthylis semicollaris, De Saussure; Rev. Zool. 1859, p. 118. 
Chetura semicollaris, Sclater, Cat. Am. B. p. 282, et P. Z. 8. 
1863, p. 99. 
Nigra; semitorque postico angusto, albo: long. tota 10:0, ale 
10:0, caude 3:0. 
Hab. Mexico. 
Mus. P.L.S. 
This fine Swift is easily distinguishable from C. zonaris by its larger 
size, and the entire absence of any traces of a white collar below. 
4. CHzTURA BIscuTATA, sp. nov. (Pl. XXXIV.) 
Cypselus biscutata, Natt. in Mus. Vindob., no. 1139. 
Fumoso-nigra, fronte et gutture dilutioribus ; nucha et plaga lata 
pectorali albis; cervice laterali corpore concolore: long. tota 
8:1, ale 8°3, caude 3°2. 
Hab. Brazil, Rio Janeiro, and Ypanema (Natt.). 
Mus. Vindob. et P. L. 8. 
Obs. Similis C. zonari, sed facie albicante et cervicis lateribus 
dorso concoloribus. 
I have only seen Natterer’s examples of this species, which were 
collected in the vicinity of Rio, in the month of June, and at Ypa- 
nema, in the months of June and September. I have some hesitation 
in considering it more than a variety of C. zonaris; but, on the 
whole, I think we may safely rely on Natterer, who separates it in 
his MS. as distinct. 
5. CHa&TURA ZONARIS. 
Hirundo zonaris, Shaw, in Mill. Cim. Phys. pl. 55. * 
Hirundo albicollis, Vieill. Nouv. Dict. xiv. p. 524, et Gal. Ois. 
pl. 120. 
Acanthylis albicollis, Sclater, P. Z. S. 1854, p. 10, et 1858, p. 59. 
Cypselus collaris, Max. Beitr. iii. p. 344; Temm. Pl. Col. 195. 
Hemiprocne collaris, Nitzsch, Pterylogr. p. 123. 
Pallene collaris, Boie, Isis, 1844, p. 168. 
Hemiprocne zonaris, Sclat. et Salv. Ibis, 1860, p. 37; Cab. et 
Heine, Mus. Hein. iii. p. 84. 
Acanthylis collaris, Gray, List Spec. Fiss. p. 15; Bp. Consp. 
p- 64, Burm. Syst. Ueb. ii. p. 364. 
Chetura zonaris, Sclater, P. Z. S. 1861, p. 79, 1863, p. 99, et 
Cat. Am. B. p. 282. 
Hemiprocne torquata, Streubel, Isis, 1848, p. 362. 
Fusco-nigra ; torque undique lato, albo: long. tota 9:0, ale 9-0, 
caude 2°5. 
Hab. Western portion of South America, from the La Plata 
northwards, and through Central America to Guatemala; Jamaica 
(Osburn) ; St. Domingo (Salle). 
Proc. Zoou. Soc.—1865, No. XL. 
