276 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



Specimens from Frontera, San Juan Bautista, and Montecristi, 

 Tabasco, and Tila, Chiapas, arc lighter below, thus showing approach 

 to dubius. Skins from Guichicovi and Tuxtepec, Oaxaca, also are 

 paler below, and are orange-red on the abdomen, thus showing tran- 

 sition to santacruzi. 



South-central Veracruz (Tres Zapotes and Paso Nuevo) to Tabasco 

 and northern Chiapas. Possibly to north central Guatemala, west 

 of Peten. (There are five specimens in the National Museum, all 

 marked Guatemala, with no definite locality.) 



Centurus aunfrons dubius (Cabot) : 



Pious dubius Cabot, Proc. Boston Soc. Nat. Hist., vol. 1, 1844, p. 164 (Uxmal, 

 Yucatan). 



Generally similar to veraecrucis but under surface distinctly paler, 

 and averaging slightly larger; abdomen bright poppy red; crown 

 and nape bright red with no gray bar. Wing, male, 130-137 (133.3) ; 

 female, 123-132 (127.2) mm. (measurements from Ridgway). 



Campeche and Yucatan to Peten and northern British Honduras 

 (limit to the south uncertain). 



Centurus aurifrons leei Ridgway : 



Centurus leei Ridgway, Proc. Biol. Soc. Washington, vol. 3, Feb. 26, 1885, p. 22 

 (Cozumel Island, Yucatan). 



Similar to dubius but much darker; rump and upper tail-coverts 

 more or less barred with black ; light frontal band sometimes lacking 

 in male. 



Cozumel and Meco Islands; Mujeres Island? 



Centurus aurifrons canescens Salvin : 



Centurus canescens Salvin, Ibis, 1889, p. 370 (Ruatan Island, Honduras). 



Similar to dubius, but white dorsal bars wider, outer webs of inner 

 primaries spotted definitely with white. 

 Ruatan and Barburat Islands. 



Centurus aurifrons santacruzi Bonaparte: 



Centurus Santa Cruzi Bonaparte, Proc. Zool. Soc. London, 1837, p. 116 

 (Guatemala). 



Abdomen deep yellow, this color being darker and more extensive 

 than in grateloupensis ; differing further from that race in darker 

 ventral surface, and, on the average, in slightly narrower white bars 

 above; ordinarily with more white in the tail; averaging paler below 

 than veraecrucis; nuchal area usually red. Wing, male, 124.5-142 

 (131.8); female, 122.5-141.5 (130.2) mm. (measurements from Ridg- 

 way). 



