The two only known specimens for Sillem's Mountain-Finch were collected in September 1929, during the Netherlands Karakorum Expedition, by J.A. Sillem. They were then identified as L. brandti.
The skins reside in ZMA, Amsterdam.

Birds to Watch 2 considers this a "data deficient" species.

Sillem's Mountain-Finch     Leucosticte sillemi
China: w Tibet, s Xinjiang, between the upper Kara Kash and the upper Yarkand River
insert after: Leucosticte nemoricola
Cornelis S. Roselaar,
A new species of mountain-finch Leucosticte from western Tibet
Bulletin B.O.C. 112, 4 (1992), 225-231
 

São Francisco Sparrow     Arremon franciscanus
e Brazil: dry caatinga zone in Bahia and Minas Gerais states
insert after: Arremon taciturnus
Marcos A. Raposo,
A new species of Arremon (Passeriformes: Emberizidae) from Brazil
Ararajuba 5, 1 (1997): 3-9
 

Some of the brush-finches have also recently been revised taxonomically.  See brush-finches splits.

Black-spectacled Brush-Finch     Atlapetes melanops
c Peru: depts. Huancavelica and Junín
insert after: Atlapetes (schistaceus) canigenis
Thomas Valqui & Jon Fjeldså,
New Brush-finch (Atlapetes) from Peru
Ibis 141, 2 (1999): 194-198