119 
Ornithology of Central America . 
the very thickest underwood; near; but not upon the ground. 
It is by no means shy, but it is hard to procure good specimens 
from the difficulty of keeping it in sight at a distance sufficient 
to avoid spoiling them. 
131. Thamnophilus melanurus, Gould? 
Vicinity of Omoa (Leyland). It is likely that this northern 
bird is really specifically distinct from the true T. melanurus of 
the valley of the Amazons. 
Subfam. Formicivorin^:. 
132. Formicivora boucardI; Sclater, P. Z. S. 1858; p.300. 
Mr. Leyland obtained a female specimen near Omoa. 
133. Cercomacra tyrannina, Sclater, P. Z. S. 1858, p.245. 
A pair of this species are in the Derby Museum, obtained 
near Coban by Delattre. Mr. Leyland obtained one example— 
a female—near Belize. 
Subfam. Formicariin^e. 
134. Gymnocichla nudtceps (Cassin); Sclater, P. Z. S. 
1858, p. 274. 
Vicinity of Omoa (Leyland). 
135. Grallaria guatemalensis, Prev.,Voy. Venus, Ois. t. 2; 
Sclater, P. Z. S. 1856, p. 294. 
Specimens of this bird in the Derby Museum at Liverpool 
were collected by Delattre at Coban in June 1843. 
Fam. XVII. TYRANNIDiE. 
Subfam. Tjsniopterin^:. 
136. Sayornis aquatica, sp. nov. 
Fuliginosa : secundariis alarum et caudse rectrice extima extus 
albo marginata: ventre medio albo: rostro et pedibus ni- 
gerrimis : long, tota 9’25, alse 3*25, caudse 3d, tarsi 0*7, 
rostri a rictu *8. 
Aff. Sayornithi nigricanti et S. cineracece , sed ab hac alis minus 
albis et pogonio rectricis extimse non omnino albo, ab 
ilia crassitie minore et crisso fuliginoso distinguenda. 
This species is resident at Duenas, where it may always be 
k 2 
