Belongs within: Thraupidae.
Conirostrum is a genus of warbler-like tanagers with slender bills (Hilty 2011).
<==Conirostrum d’Orbigny & Lafresnaye 1838 [Conirostridae]H11
|--+--C. bicolor (Vieillot 1809)BKB15, H11 [=Sylvia bicolorH11, Ateleodacnis bicolorH11]
| | |--C. b. bicolorH11
| | `--C. b. minus (Hellmayr 1935)H11
| `--C. margaritae (Holt 1931)BKB15, H11 [=Ateleodacnis margaritaeH11]
`--+--C. albifrons Lafresnaye 1842BKB15, H11
| |--C. a. albifronsH11
| |--C. a. atrocyaneum Lafresnaye 1848H11
| |--C. a. centralandium Meyer de Schauensee 1946H11
| |--C. a. cyanonotum Todd 1932H11
| |--C. a. lugens Berlepsch 1901H11
| `--C. a. sordidum Berlepsch 1901H11
`--+--Oreomanes Sclater 1860BKB15, H11
| `--O. fraseri Sclater 1860 [incl. O. fraseri binghami, O. fraseri sturninus]H11
`--+--C. sitticolor Lafresnaye 1840BKB15, H11
| |--C. s. sitticolorH11
| |--C. s. cyaneum Taczanowski 1875H11
| |--C. s. intermedium Berlepsch 1893H11
| `--C. s. pallidum Aveledo & Pérez 1989H11
`--C. speciosum (Temminck 1824)BKB15, H11 [=Sylvia speciosaH11, Ateleodacnis speciosaH11]
|--C. s. speciosumH11
|--C. s. amazonum (Hellmayr 1917)H11
`--C. s. guaricola Phelps & Phelps 1949H11
Conirostrum incertae sedis:
C. cinereum d’Orbigny & Lafresnaye 1838H11
|--C. c. cinereumH11
|--C. c. fraseri Sclater 1859H11
`--C. c. littorale Berlepsch & Stolzmann 1896H11
C. ferrugineiventre Sclater 1855H11
C. leucogenys (Lafresnaye 1852) [=Dacnis leucogenys, Ateleodacnis leucogenys]H11
|--C. l. leucogenysH11
|--C. l. cyanochroum (Todd 1924)H11
`--C. l. panamense (Griscom 1927)H11
C. rufum Lafresnaye 1843H11
C. tamarugense Johnson & Millie 1972H11
*Type species of generic name indicated
References
[BKB15] Burleigh, J. G., R. T. Kimball & E. L. Braun. 2015. Building the avian tree of life using a large-scale, sparse supermatrix. Molecular Phylogenetics and Evolution 84: 53–63.
[H11] Hilty, S. L. 2011. Family Thraupidae (tanagers). In: Hoyo, J. del, A. Elliott & D. A. Christie (eds) Handbook of the Birds of the World vol. 16. Tanagers to New World Blackbirds pp. 46–329. Lynx Edicions: Barcelona.