90 
by the bright chestnut colouring of its lower back, above which, in 
the middle of the back, are a few black-tipped feathers, forming a 
small black patch. It must be placed next to the Brazilian Formi- 
civora maculata, (Max.) (Leptorhynchus striolatus, Menetries, Mém., 
del’ Ac. St. P. 1835, pl. 10. fig. 2*), with which it agrees in form and 
style of plumage. A single example of it is in the British Museum, 
5. DysIrHAMNUS SEMICINEREUs. (Pl. XCVII.) 
& cinereus, pileo intensiore ; subtus medialiter albicantior : dorso 
postico et remigum marginibus cum ventre imo olivascentibus : 
tectricibus alarum tenuissime albo limbatis : rostro pedibusque 
nigris. 
2 olivacea, pileo rufescente: gutture medio albo, lateraliter 
cinerascente: ventre flavicanti-olivaceo; mandibula inferiore 
basi albicante. 
Long. tota 4°5, alee 2°4, caudze 1°6. 
In this apparently new Dysithamnus, of which the British Museum 
contains several specimens, the cinereous colour in the male occupies 
the whole upper plumage down to the middle of the back, where it 
gradually passes into olive, and the whole lower plumage down to 
the middle of the belly, where a like colour supervenes. The middle 
of the body beneath is much paler. The bill is rather longer than 
in D. mentalis, but the form is otherwise the same. The genus to 
which this bird belongs is certainly very closely connected with 
Thamnophilus, but I doubt whether that form can be divided even as 
a subfamily from the South American Ant-thrushes. 
6. PyRIGLENA TYRANNINA. (Pl. XCVIII.) 
S nigricanti-cinerea, carpo summo et alarum tectricum margint- 
bus albis: plaga dorsi medii interna nivea ; subtus paulo pal- 
lidior, rostro et pedibus nigris. 
9 pallide brunnea, rufescente tincta ; abdomine toto clare rufo : 
mandibula inferiore, nisi apice alba. 
Long. tota 5°2, alee 2°5, caudze 2°25. 
A series of. specimens in the British Museum clearly connect the 
somewhat dissimilar male and female of this species, which it is diffi- 
cult to place satisfactorily. in any of the present established genera 
of this family as far as I am acquainted with them, though without 
doubt a member of the group, with somewhat of a Tyrannine aspect. 
The characteristic white patch underneath the feathers of the back 
is well marked in both sexes. 
* M. Menetries has made this bird a second species of his genus Leptorhynchus, 
but I do not think it can be satisfactorily arranged along with the peculiar form 
which he has made the type of his genus; and the name Leptorhynchus being 
preoccupied, I propose to change it into Psilorhamphus. Type P. guttatus, mihi. 
(Leptorhynchus guttatus, Men. pl. 10. fig. 1.) 
