470 



NESTS AND EGOS OF 



716. Nest and Eggs of the Rock Wren. (From TAe Ntdologist. ) 

 of the common Rock Wren, S. obsoletus. Set No. 781 in Mr. Bryant's collection meas- 

 ures 17x14, 17x14.5, 18x14.5, 18.5x14.5 millimeters.* Set No. 782 measures in milli- 

 meters, 19x14, 19x14, 19.5x14.5, 19.5x14.5, 19.5xl5.t The two largest eggs in a series of 

 fifty-two specimens measure 21x15 mm. and 20x16 mm. respectively; the two smallest 

 17x14 mm.; average 19x14 mm.t 



[717.] WHITE-THBOATED WREIT. Caterpes mexicanus (Swains.) Geog. 

 Dist. — Mexico, from Oaxaca and Orizaba northward on the tablelands. Texas 

 (Giraud). 



This bird is similar to the next form, but is darker colored above and below, with 

 a sharper contrast of the white throat; the white speckling mostly confined to the 

 back and wings. It is common to Mexico and its range extends to the Texan border. 

 In all respects its habits, nests and eggs are indistinguishable from those of 0.' m. 

 conspersvs. 



717a. CANON WREN. Catlierpes mexicanus conspersus Ridgw. Geog. Dist. — 

 Great Basin and Rocky Mountain region, from the Sierra Nevada and Cascades eastward 

 to Southern Idaho, Wyoming, Colorado and Western Texas ; south on the tablelands 

 of Mexico to Aguas Calientes. Breeds nearly throughout its range; resident in south- 

 ern parts of its range in U. S. 



The rocky canons of the mountain regions throughout its range are the home of 

 this species. It is easily recognized by its white throat and rich yellowish-brown 

 tail, and by its notes, — a peculiar insect-like chirp, an.d a delightful clear whistling 



* .67x'.55, .67X.57, .71X.57, .73x,57. 



t .75X.55, .75X.55, .77X.57, .77X.55, .77X.59. 



t liargest .83x.59 and .79X.63; smallest .67x.55; average .75x.B5. 



