THRYOTHORUS. . 95 
Thryothorus albinucha, Baird, Rev. Am. B. i. p. 149; Salv. Ibis, 1866, p. 191°; Lawr. Ann. Lyc. 
N. Y. ix. p. 199%. 
Thryothorus petenicus, Salv. P. Z.S. 1868, p. 187°; Baird, Rev. Am. B. i. p. 125° 
Supra brunneus, uropygio paulo rufescentiore et maculis celatis albis notato; alis vix nigro transfasciatis, loris 
et superciliis albis, regione postoculari brunnea ; capitis et colli lateribus albis nigro vix vittatis ; cauda 
nigra, rectricibus duabus extimis albo irregulariter punctatis, duabus mediis fusco-brunneis, his et reliquis 
nigro fasciatis; subtus albus, hypochondriis brunneo lavatis, crisso nigro distincte transfasciato ; rostri 
maxilla cornea, mandibule basi albicante ; pedibus pallide corylinis. Long. tota 5:1, alee 2°3, caude 2:0, 
rostri a rictu 0-9, tarsi 0°85. (Descr. exempl. ex Sakluk, Peten. Mus. nostr.) 
Hab. Mexico, Yalahao! and Merida*, Yucatan (Cabot!, Schott‘); Guatemata, Sakluk, 
near Peten (0. 5.5%). 
This species is one of very restricted range, being confined to the promontory of 
Yucatan and the adjoining district of Peten. Dr. S. Cabot first discovered it during 
his travels in Northern Yucatan, where it has since been obtained near Merida by 
Dr. Schott. When at Sakluk near Peten, April 1862, Salvin shot a single specimen of 
this Wren on the outskirts of a thicket in the open savannas in which the village is 
situated. This bird was afterwards described as 7. petenicus, but found to be in- 
separable from Dr. Cabot’s bird when compared with it by Prof. Baird 2. 
We have figured the type of 7. petenicus. 
d. Rostrum debile. 
9. Thryothorus bairdi. 
‘Thryothorus bewicki, var. leucogaster, Baird, Rev. Am. B.i. p. 127° (nec T. leucogaster, Gould) ; 
Baird, Brew. & Ridgw. N. Am. B.i. p. 147°; Lawr. Mem. Bost. Soc. N. H. i. p. 268°; 
Bull. U.S. Nat. Mus. no. 4, p. 14 *. 
Thryomanes bewicki leucogaster, Coues, B. Col. Vall. i. p. 169°. 
Thryomanes bewicki, var. leucogaster, Merrill, Pr. U.S. Nat. Mus. i. p. 121°. 
Thryothorus bewicki, Scl. P. Z. 8. 1859, p. 3727; Dugés, La Nat. i. p. 189°; Sennett, Bull. U.S. 
Geol. Surv. iv. p. 9°. 
Murino-brunneus, cauda nigro indistincte irrorata, rectricibus externis extus albo variegatis ; loris et super- 
ciliis distinctis albis, stria postoculari murina; capitis lateribus et corpore subtus sordide albis, crisso 
indistincte fusco transvittato; rostro et pedibus fuscis, mandibule basi pallidiore. Long. tota 4-7, alee 
2-1, caude 2:0, rostri a rictu 0°75, tarsi 0-6. (Descr. exempl. ex Oaxaca, Mexico. Mus. nostr.) 
Hab. Norra America, Colorado5 and Rio-Grande valleys °®.—MeExico, Tamaulipas 
and Nuevo Leon (Cowch 1), Guadalaxara (Grayson *), Guanajuato (Dugeés >), valley 
of Mexico (le Strange), Oaxaca (Boucard’), Puente Colorado (Sumichrast *). 
This Wren is a race of 7. bewicki, found in Mexico and the border lands of the Rio- 
Grande and Colorado valleys, having two near allies in the northern continent—one, 
T. bewicki, belonging to the south-eastern States and as far west as Texas, and the 
