127 
Measurements. 
& 
s 
X 
o 
Cf} 
Locality. 
tt s 
£ 
Tail. 
a 
o 
a 
73 
o 
Tarsus. 
Middle toe. 
Collected by— 
r. r ... 
cHad.. 
?? ad.. 
Demerara. 
r>. 70 
4. 50 
0. 45 
1. GO 
1.10 
(>. S. 
Bahia. 
G. 30 
4. 90 
0.50 
1.90 
1. 30 
Wucherer. 
Do . 
rf 1 ad 
4.10 
0. 45 
1. 55 
Do. 
Do. 
rf ? ad: 
Venezuela (San Estaban). 
G. 50 
4. 80 
0.50 
1.80 
i. 30 
Gee ring. 
Do. 
Jjuv.: 
New Granada. 
5. 40 
4. 20 
0. 45 
1.50 
1.10 
(Verreaux.) 
Do. 
? juv.: 
Veragua (Santiago). 
G. 10 
4. 90 
0. 50 
1. 80 
1.25 
E. Arce. 
Do. 
;?juv.: 
19 jnv.: 
Rio Janeiro. 
G. 10 
5. 30 
0. 50 
1. 90 
1.35 
Do. 
.do. 
G. 35 
5. 50 
0. 52 
1.85 
1. 35 
List of specimens examined. — In Mus. O. Salvin, 7 ; G. N. Lawrence, 2 ( Panama ) ; 
Pbilad. Acad., 3 ( Cayenne ); Boston Soe., 2 ( Brazil, Venezuela, Cayenne ); American 
Mus., New York, 3; R. Ridgway, 1 (Demerara) ; total, 18. 
NISUS 0 HIERASPIZIAS) COLL AIMS. 
Micronisus collaris Kale, MS. in Mus. Brit., unde — 
Jccipiter collaris Scl. Ibis, ii, 1860, 148, pi. vi (adult and young).—L awrence, Ann. 
Lye. N. Y. 1862, 8 (New Granada).—G ray, Hand List, i, 1869, 33.—Scl. & Salv. 
Norn. Neotr. 1873, 120.—Sharpe, Cat. Acc. B. M. 1874, 144.—Salt. Ibis, iv, 
1874, 321. 
Xisus collaris Giebel, Thes. Orn. 1872, 263. 
Hab .—New Granada. 
Sp. ch. —Wing, 6.75-7.00; tail, 5.00-5.50 ; culmen, 0.55; tarsus, 1.75- 
2,00; middle toe, 1.28. Fourth quill longest; first shortest; outer 
lour with inner webs sinuated. Tail even. Adult (?): —Above dark van- 
dyke-brown, becoming blackish on the pileum ; a nuchal collar of white, 
with the tips of'the feathers dusky. Tail brownish-slate, crossed by 
five bands of black, about equal in width to the slaty bauds. Lower 
parts white, marked everywhere, except on throat, with very regular, 
sharply-defined broad bars of vaudyke-brown, averaging nearly or quite 
as wide as the white interspaces. Young : —The dark brown of the 
adult (?) replaced by ferruginous, this brightest on the tail, which has six 
instead of five black bands. Lower parts “ cinnamomeous-wliite ”, the 
tibhe more rusty, the sides barred, as in the adult. (Fide Sclater, Ibis, 
1860, p. 119.) 
We are not satisfied as to whether the above description of the sup¬ 
posed adult is really the mature stage or the brown phase of the young. 
Our description is taken from the specimen in the museum of the Phil¬ 
adelphia Academy of Natural Sciences, which came from Bogota. 
APPENDIX. 
Regarding Falcopoliogaster Temrninck and Asturpectoralis Bonaparte, 
mentioned on page 91, we have, as yet, seen no specimens. We strongly 
incline to the belief that they will be found different from the true Am, 
and each sufficiently peculiar in details of form to constitute a subgenus 
by itself. 
Regarding F. poliogaster , Mr. Gurney writes us that it is more like 
Leucopternis in its generic characters than typical Xisus; and we regard 
the remarkable coloration of A. pectoralis is a sufficient cause for sus¬ 
pecting the impropriety of referring the latter species to either section 
of the genus Xisus as defined in our monograph. (See Sclater, Ibis, 
1801, pp. 313-311, pi. x). 
The synonymy and specific characters of these two aberrant species 
are as follows:— 
