112 
ForMICARIINE. 
26. Thamnophilus stellaris, Spix ? (Av. Bras.ii. p. 27. pl. 36. fig.2). 
3 cinereus : pileo dorsoque summo et medio nigris, hujus pennis 
basi niveis : alarum tectricibus apice maculis rotundis, albis. 
9 supra pallide cinereus : subtus brunneus, lateribus cinerascen- 
tibus : alis externe rufis. 
Long. tota 5-2, ale 3:0, caudee 1°6. 
This is a typical Thamnophilus with a strong thick bill. There are 
several examples of it in the Paris Museum in different states of plu- 
mage, and it was from examining them that I was enabled to decide 
that the female above described (which is in my own collection) 
belongs to this species. 
27. Cymbilanius lineatus (Leach), ¢ & ¢. 
28. Formicivora cerulescens (Vieill.), Menetr. Mon. t.6. fig. 1 & 2. 
p- 499 (?). 
29. Pyriglena quixensis (Cornalia). 
Thamnophilus quivensis, Corn. Vert. Syn. p. 12*. 
P. atra, abdomine cinerascente : tectricibus alarum maculis rotun- 
dis, albis terminatis: dorsi plumis lawis, elongatis, basi albis : 
rectricibus apice albis. 
Long. tota 4°5, alee 2°1. 
30. Pyriglena rufiventris (Cornalia). 
Thamnophilus rufiventris, Corn. Vert. Syn. p. 12. 
P. atra, abdomine lete castaneo : alarum tectricibus maculis ro- 
tundis, albis terminatis : dorsi plumis laxis, elongatis, basi albis : 
rectricibus graduatis, harum extimis apice albis ; rostro pedi- 
busque nigris. 
Long. tota 4°5, alee 2-1, caudee 2°0. 
I have little doubt that I have correctly referred these two birds 
to the species described by Dr. Cornalia, the types of which I had 
an opportunity of examining through his kindness when last at 
Milan. Although they closely resemble one another, except in the 
colouring of the belly, there is so much difference in the form of the 
bill in the two specimens in this collection, that I think it hardly pos- 
sible that, as suggested by Dr. Cornalia, the variations between them 
can be due to age or sex, and I believe them distinct though nearly 
allied species. I have placed them in the genus Pyriglena, with the 
type of which, P. domicella, they agree in several respects ; particu- 
larly in the lax and elongated feathering of the lower back—a curious 
structure occurring in several groups of birds, Pycnonotus, Philen- 
toma, &c., and which has not yet, as far as I am aware, been fully 
explained. In this same genus I should also place that peculiar form, 
the Myiothera nudiceps of Cassin (Proc. Ac. Sc. Phil. 1850, p. 106), 
* Dr. Cornalia’s paper, which is little known in this country, is entitled ‘ Ver- 
tebratorum Synopsis in Museo Mediolanense exstantium qu per novam orbem 
Caietanus Osculati collegit annis 1846, 47, 48 speciebus novis vel minus cognitis 
adjectis necnon descriptionibus atque iconibus illustratis : Modoetiz 1849.” 
