68 BTTLLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Melanerpes duUus Hargitt, Cat. Birds Brit. Mus., xviii, 1890, 173, part (Buctzotz, 

 Temax, Peto, and Tabi, Yucatan; Cayo, San Felipe, Eio Mopan, and Belize, 

 Brit. Honduras). — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1895, 

 422, part.— Chapman, Bull. Am. Mus. N. H., viii, 1896, 285 (Chichen-Itza, 

 Yucatan).— Cole, Bull. Mus. Comp. ZooL, 1, 1906, 130 (Chichen-Itza). 



[Melaiwrpes] dubius Sharpe, Hand-list, ii, 1900, 211, part. 



Picas carolinensis (not Picus carolinus Linnaeus) Cabot, App. Stephens' Trav. 

 Yucatan, ii, 1848, 475 (TJxmal, Yucatan). 



[Centurv^] erytkrophthalmus Lichtenstein, Nom. Mus. BeroL, 1854, 76 (nomen 

 nudiun; coll. Berlin Mus.). 



Clentunis] erytftropfeftaZmtw 'Reichenbach, Hand. Scansores, Picinse, 1854, 409, 

 pi. 664, figs. 4396, 4397. 



Zebrapicus erythrophthalmus Malhekbe, Mon. Picid., ii, 1862, 243; iv, 1864, 

 pi. 105, figs. 1, 2, 3. 



Centwus santacruzi (not of Bonaparte) Sclateb and Salvin, Ibis, 1859, 136, part. 

 (Yucatan). 



Centurus alUfrons (not Picus alMfrons Swainson) Gray, List Birds Brit. Mus., 

 Picidse, 1868, 102.— Cabanis, Joum. fur Om., 1862, 824 (crit.).— Nehb- 

 KOEN, Joum. fur Om., 1861, 69 (Yucatan; descr. eggs). — Lawkence, Ann. 

 Lye. N. Y., ix, 1869, 205 (M^rida, Yucatan; crit.).— Salvin, Cat. Strick- 

 land Coll., 1882, 399 (Guatemala). 



[Centurus'\ albifrons Gray, Hand-list, ii, 1870, 198, no. 8768. — Sclatbe and 

 Salvin, Nom. Av. Neotr., 1873, 100. 



Picus alUfrons (not of Swainson) Sundevall, Consp. Av. Picin., 1866, 52, part 

 ("Mexico"). 



CENTDRUS DUBIUS VERffiCRUCIS (Nelson). 



VXBA CSTTZ WOODPECKER. 



Similar to O. d. dubius, but slightly smaller, white bars on back, 

 etc., slightly broader (or black bars narrower), under parts shghtly 

 darker and more strongly tinged with yellowish (especially on sides 

 and upper abdomen) and red of abdomen more restricted, paler, and 

 frequently inclining to orange-red;" adult female frequently with 

 white markiugs on inner web of middle rectrices." 



Adult maZe.— Length (skins), 209-241 (224); wing, 122-133 

 (126.9); tail, 64-82 (74.4); cuhnen, 24.5-33.5 (29.9); tarsus, 21-24 

 (22.2); outer anterior toe, 18-20 (19.2).* 



o These characters show, clearly, "intergradation" with C. santOrcnizi gratelmipends, 

 as does also an occasional tendency in adult males to an interruption of the red pileum 

 •by an invasion of the supra-auricular gray on each side of the occiput, one specimen 

 (no. 106,235, coll. Am. Mus. Nat. Hist., from Rio Givicia, Oaxaca) having a com- 

 plete, though narrow, occipital band of gray; but I am disposed to consider the inter- 

 mediates, which constitute a small minority of the specimens examined, as hybrids, 

 as otherwise it would be very difficult to account for the existence of two conspeciflc 

 forms, so different as are C. d. versserucis and C. s. gratelouperms in their typical 

 state, in the same districts. 



6 Nineteen specimens. 



