80 EXPLORATIONS AND SURVEYS WEST OF IOOTH MERIDIAN. 



39. Pooccetes gramineus (Gm.), var. conftnis, Bd. Western Grass-Finch. 

 Abundant. Nests on the ground among the sage-brush. Two nests 



were obtained in South Park, Colorado, by Dr. Rothrock. Nest a slight 

 structure of dried grasses, lined slightly with cottony substances from 

 plants. Eggs four or five in number, of a greenish-white ground-color, 

 blotched all over with light-brown and obsolete markings of purple, with 

 a few black streamings. 



40. ZonotricMa leucophrys (Forst.) White-crowned Sparrow. 



This species was not observed by me after the 1st of June. Dr. Roth- 

 rock, however, found it breeding in the South Park. 



41. Junco caniceps ( Woodh.) Red-backed Snowbird. 



In the heavy pine-woods in the neighborhood of Garland and among 

 the bushes that fringe the small mountain-streams, this snowbird was 

 the most abundant species of the locality. By the 1st of June the 

 greater number appeared to be paired and breeding, though I was not 

 able, after a careful search, to find their nests. The song consists of a 

 rapid succession of low, trilling notes, which is usually emitted from 

 the top of some low spruce or pine. Upon leaving the mountains of 

 Colorado, this species was left behind, and in New Mexico is replaced in 

 the mountains by the closely-allied form dorsalis. 



42. Spizella socialis (Wils.) Chipping Sparrow. 



Not uncommon, keeping to the wooded districts along the streams. 

 Notes and habits precisely as at the East. 



43. Spizella pallida (Sw.), var. breweri, Cass. Brewer's Sparrow. 



Rather numerous. Inhabits the sage-brush and greasewood of the 

 plains. Its song is short and weak, and somewhat resembles that of 

 the Yellow- winged Sparrow (C. passerinus). It consists of a short pre- 

 lude, followed by a succession of short, quickly-uttered notes, very well 

 expressed by the striking together of pebbles.' 



