94 PROCEEDINGS OF UXITED STATES NATIONAL MUSEUM. 



am not autoptically acquainted, but wliich appears to be a northern 

 form of G. tricolor^ or, ijossibly, a local race of C. aurifrons duhius ; (3) 

 C. tricolor (Wagl.), which in some specimens so closely approaches C. 

 aurifrons lioffmanni that it is often difficult to decide to which a given 

 specimen should be referred; and (4) C. terricolor, Berlepsch, which is 

 possibly a local race of C. tricolor. In the following synopsis, I have 

 subordinated as sub-species only those forms which are known with 

 certainty to intergrade, all of which belong to C. aurifrons. Those of 

 doubtful relationship are treated as species, since it seems best to ac- 

 cord them that rauk until it can be proven they are not entitled to it. 

 Two more or less apocryphal species referred by Malherbe {Monographie 

 des Picidees, ii, 18G2) to this genus, Picus gerini, Temm. and P. aiiroca- 

 pillus, Vig., are not included in the synoptical table, but a transcription 

 of Malherbe's account of these supposed species is given at the end of 

 this paper. 



LITERATURE. 



The genus Centurus has received special attention, so far as I have 

 been able to discover, from but three authorities, viz, Malherbe, Ca- 

 banis, and Sundevall, whose arrangements of the species, with the equiv- 

 alent names of the present synopsis, are given below in chronological 

 order. Also, as showing the latest arrangement, the names adopted in 

 Sclater and Salvin's Nomenclator Avium Neotropicalium. 



(1.) MALHERBE (1862). 



MonograpWe des Picidees, etc., etc., par Alf. Malherbe. 4 vols, folio. Metz : 1861-2. 

 [The genus "Zebrapicus" { = Centurus) ia treated in yoI. ii (text), pp. 223-250, 

 and vol. iv (plates), pU. — . ] 



1. Zebrapicus superciliaris, p. 223, pi. 102, figs. 1, 2, and 4. = C. super ciliar is. 



2. " elegans, p. 225, pi. 102, figs. 5, 6. = C. eJegans. 



3. " jjMcfteraw)', p. 227, pi. 103, figs. 1,2. {^ Melanerpes pucherani.) 



4. " hypopolius, p. 228, pi. 103, figs. 4, 5. == C. hypopolius. 



5. " jfenntj, p. 231. (^ Melanerpes pucherani?) 



5. " striatus, p. 231, pi. 107, figs. 2, 3. = C. striatus. 



6. " cm-oUnus, p. 234, pi. 103, figs. 7, 8. ^= C. caroUnus. 



7. ^' radiolattis, p. 237, pi. 104, figs. 5, 6. = C. radiolatus. 



8. " aurifrons, p. 240, pi. 104, figs. 1, 2, 3. = C. aurifrons. 



9. " santa-cruzi, p. 241, pi. 105, figs. 4, 5. = C. aurifrons santa-cruzi. 



10. " erytkrophthalmus, p. 243, pi. 10.5, figs. 1,2. = C. aurifrons dubius. 



11. " kaupii, p. 245, pi. 106, figs. 4, 5. = C. uropygiaUs. 



12. " tricolor, p. 247, pi. 106, figs. 1, 2. = C. tricolor. 



13. " ruhriventris, ji. 248, pi. 107, fig. 1. = C. ruiriventris. 



14. " aurocapillus, p. 250. (Unidentified.) 



(2.) CABAXIS (1862). 



Ubersicht der im Berliner Museum befindlichen Vogel von Costa Rica. <[ Jour, fiir 

 Orn. Heft v, x. Jahrgang, September, 1862, pp. 321-336. [A synopsis of the species 

 of Centurus, with synonymy and critical remarks, is given on pp. 322-330.] 



1. C. aurifrons, p. 323. = C. aurifrons, as restricted. 



2. C. caroUnus, p. 324. = C. carolinus. 



3. C. aJbifrons, p. 324. = C. aurifrons sanfacruzi and C. aurifrons 



duMus. 



