272 PROCEEDINGS OF THE ACADEMY OF 



tittensis, Lesson, Cayenne." One specimen, evidently not in mature plumage, 

 has the superciliary stripes yellow, nearly uniform with the under parts of the 

 body, but is otherwise not different. This species seems to be characterized 

 by its white throat, which color is narrowly enclosed between the dark brown 

 of the cheeks. 



6. Certhiola chloropyga, Gabanis. 



Certhiola chloropyga, Cab. Mus. Hein., i. p. 97 (1850). 



Reich., Vollst. Naturg. Vbg., pi. 561, fig. 3826. Hahn's Voegel, pt. yi. pi. 4? 



Numerous specimens from Brazil. Apparently an abundant and rather 

 widely diffused species. Total length about 4^ inches. 



1. Certhiola guianensis, Cabanis. 



Certhiola guianensis, Cab., Mus. Hein., i. p. 97 (1850), 



Reich., Vo.-g., fig. 3825. 



Several specimens, one of which is labelled " Bresil." This species seems 

 to be one of the smallest of the group, the specimens before me being even 

 smaller than the measurements given by Dr. Reichenbach, (Spec. Orn., pt. v. 

 p. 252). Total length 3J inches. 



The genus Certhiola is the most difficult of this group, and although the 

 species have been indicated with singular ability by Dr. Cabanis, and subse- 

 quently more fully described by Dr. Reichenbach, they are not to be dis- 

 tinguished in most cases (as at present described,) without careful scrutiny. 

 In addition to the preceding species, I have seen one other specimen, not in 

 good condition, in the collection of the Smithsonian Institution, from Peru, 

 which is apparently another and probably undescribed species. 



5. Genus CONIROSTRUM, D'Orbigny et Lafresnaye, Mag. Zool., 1843. 



1. Conirostrum sitticolor, Lafresnaye. 



Conirostrum sitticolor, Lafres., Rev. Zool., 1840, p. 102. 

 Dacnis rufocinerea, Bonap., " 1845," Consp. Ay., i. p. 401 (1850). 

 Conirostrum rufum, Lafres., Mag. Zool., 1843, p. 3? 

 Conirostrum bicolor, Less. 

 Gray's Genera, i. pi. 34. Reich., Voeg., fig. 3751. 



Six specimens, from " Bogota " and " Colombie." One specimen shows a 

 tendency to O. rufum, which I have little doubt is the young of this species. 



2. Conirostrum rufdm, Lafresnaye. 



Conirostrum rufum, Lafres., Mag. Zool., 1843, p. 3. 

 Four specimens from Bogota. This bird is very probably the young of the 

 preceding. 



3. Conirostrum albifrons, Lafresnaye. 



Conirostrum albifrons, Lafres.. Rev. Zool., 1842, p. 301. 

 Conirostrum atrocyaneum. Lafres., Rev. Zool., 1848, p. 9. 

 Conirostrum caeruleifrons, Lafres., Rev. Zool., 1842, p. 302. 

 Guerin's Mag. Zool., 1843, pi. 35. Reich., Voeg , fig. 3750. 

 Ten specimens, four of which are C. alhifrona; four are clearly C. cnernhi- 

 fronn, and two are intermediate, showing conclusively that the two are identi- 

 cal, as suggested by Dr. Sclater iu Proc. Zool. Soc, London, 1855, p. 138 ; 

 although in his Catalogue of American Birds (1862,) he continues to give 

 them as distinct species. 



4. Conirostrum cineueum, D'Orbigny et Lafresnaye. 



Conirostrum cinereum, D'Orb. et Lafres , Mag. Zool., 1838, p. 25. 



Conirostrum Fraseri, Sclat., Proc. Zool. Soc, London, 1858, p. 452 ? 

 D'Orb , Voy. Am. Mer. Ois., pi. 59, fig. 2. 



Several specimens, one of which, labelled " Tacna, Peru," is from Mons. 

 D'Orbigny's collection. Two others in a collection from Ecuador, recently 



[Nov. 



