12 
I cannot discover how the Culicivora mexicana, Bp. Consp. p. 316 
(of which I have examined the type in the Berlin Museum), differs 
from this species. It appears to me to be merely a female of the 
present bird. 
2. PoLiopTiILa puMmicoLa (Vieill.). 
El Contra-maestre azuladillo, Azara, no. 158, unde Sylvia dumi- 
cola, Vieill. C. dumicola, @ Orb. Voy. Ois. p. 331.  C. boliviana, 
Sclater, in Proc. Zool. Soc. 1852, p. 34. pl. 47. 
3 Supra plumbea: fronte et genis nigris: subtus plumbescenti- 
alba, ventre et rectricibus utrinque extimis albis. 
9 Fronte et regione auriculart plumbeis concoloribus. 
Hab. Paraguay (Azara); Corrientes and Buenos Ayres in the 
Argentine Republic, and Chiquitos and Moxos in Bolivia (d’Orb.). 
D’Orbigny and Lafresnaye in their Synopsis in the Magazin de 
Zoologie, Hartlaub in his Index to Azara, and Bonaparte in his Con- 
spectus, have all more or less confounded the synonyms of this species 
with those of the next ; mdeed the latter author has united all the 
synonyms under one head, and I was thus led into the error of de- 
scribing the present bird as new. It is without doubt however the 
Azuladillo of Azara, and consequently must bear the specific name 
‘dumicola’ of Vieillot. Lichtenstein’s nanie ‘divittata’ belongs to the 
next species, though the above-mentioned authors have quoted it as 
synonymous with this. 
3. PoLiopTiLa LEUCOGASTRA (Max.). 
Pl. Enl. 704. fig. 1, unde Motacilla cerulea, var. 3. Gm. Sylvia 
leucogastra, Max. Beit. iti. 710. SS. d¢vittata, Licht. in Mus. Berol. 
C. atricapilla, Sw. Zool. Ml. nu. s. pl. 57. C. leucogastra, Gray’s 
Gen. ? C. dumicola, Bp. Consp. p. 316. 
& Cinerea, pileo nigro: subtus alba, rectricibus utrinque eatimis 
albis. 
2 Pileo concolore cinereo. 
Hab. Brazil; Bahia (Pr. Max.); Monte Video (Mus. Berol.) ; 
Cayenne (Buffon): New Grenada. 
This species is described by Prince C. L. Bonaparte in his Con- 
spectus as C. dumicola, from which it may be easily distinguished by 
its black head.. 
4, PoLiopTiLa BILINEATA (Licht.). 
Sylvia bilineata, Licht. in Mus. Berol. Culicivora bilineata, Bp. 
Consp. p. 316. 
3 Supra plumbea, pileo nigro: loris superciliis et corpore subtus 
albis : primartis anguste cinereo, secondariis latius albo mar- 
ginatis : rectricibus extimis apice albis. 
9 Pileo concolore plumbeo: superciliis albis. 
Hab. Cartagena (Mus. Berol.). 
The type-specimens in the Berlin Museum are the only examples 
I have seen of this species; which may be at once distinguished from 
all the preceding by its white superciliary stripe. 
