174 New Species of Birds from Mexico. 



Dimensions of type. Wing 74; tail 75; culmen 17; tarsus 23. 

 Remarks. Both males and females of this form may be distinguished 

 from /. c. duple jc us by their deeper coloration. 



Stelgidopteryx ridgwayi sp. nov. 

 Ridgway's Rough-winged Swallow. 



Type No. 167,947, $ ad., U. S. National Museum, Biological Survey 

 collection, from Ohichen Itza, Yucatan, Mexico. Collected January 29, 

 1901, by E. W. Nelson and E. A. Goldman. 



Distribution. Yucatan and other parts of Mexico south of the Isth 

 mus of Tehuantepec, and probably adjacent part of Guatemala. 



Description. Lores with distinct grayish white spots just back of 

 nostrils: rest of upper parts blackish brown, darkest on wings and tail 

 and slightly paler on rump and tertiaries, latter narrowly edged with 

 grayish white (color of upper parts much darker than in 8. serripennis)- 

 throat, breast and sides of body grayish brown, palest on throat, rest of 

 underparts of body white; under tail coverts white with broad black 

 tips to longest coverts; size larger than 8. serripennis and tail much 

 more deeply emarginate. 



Dimensions of type. Wing 117; tail 57; culmen 9; tarsus 12. 



Remark*. This well marked species was common in Yucatan, living 

 in the caves in the sides of cenotes or natural wells. They were also 

 found about the foothills at Teapa, Tabasco. Its dark back and black 

 tips to under tail coverts render it easily separable from its nearest rela 

 tive, Stelgidopteryx serripennis. 



Troglodytes peninsularis new species. Mangrove House Wren. 



Type No. 168,115, $ ad., U. S. National Museum, Biological Survey 

 collection, from Progreso, Yucatan, Mexico. Collected March 5, 1901, 

 by E. W. Nelson and E. A. Goldman. 



Distribution. The arid coastal belt of northern Yucatan. 



/Specific characters.- A pallid species with general resemblance to 

 Troglodytes aedon aztecus but with heavier bill and feet; shorter wings 

 and tail, and more reddish brown suffusion, especially on underparts. 

 Upperparts dull bister brown, becoming paler and more reddish on rump 

 and tail; throat, middle of breast and abdomen white, lightly suffused 

 with pale fulvous; sides of neck and body strongly suffused with dull 

 reddish brown, darkest on flanks; under tail coverts whitish with narrow 

 blackish bars narrowly bordered with dull reddish brown. 



Dimensions of type. Wing 50; tail 38; culmen 14; tarsus 18. 



Remarks. We found this wren very common among the scattered 

 growth of mangroves over a broad salt flat bordering the lagoon back of 

 Progreso. A few were seen in the brush-grown country adjoining the 

 flats but the latter were apparently their home. They were in full song 



