236 General Notes. L April 



Notes on some Species New to the Colorado List of Birds. — 



Among the results accomplished through a biological survey of Colorado 

 by the Colorado Museum of Natural History, the following notes are of 

 general interest and it seems advisable to record them at this time. 



Tympanuchus pallidicinctus. Lesser Prairie Chicken. — As the 

 presence of this bird within the limits of Colorado was considered probable, 

 a special trip was made into the extreme southeast corner of the state 

 (Baca County) during May, 1914. The first specimen was secured May 

 24 (C. M. N. H. No. 4146, adult male). Another trip into the same terri- 

 tory from Sept. 21 to 23, of the same year afforded additional specimens 

 of both sexes. ' 



It was assumed that this region marked the northernmost limits of their 

 range but in the fall of 1916, they were found to be fairly common in the 

 sandhill country immediately to the south of the Arkansas River in the 

 vicinity of Holly, Prowers County, where specimens were obtained. Syste- 

 matic search, however, failed to disclose any evidence of their presence on 

 the north side of the river, where the country is, in fact, quite different and 

 unsuited to their needs. The Arkansas River, therefore, may be considered 

 as the northern boundary of the range of this species. 



Dryobates p. medianus. Downy Woodpecker. — This variety is 

 given in the Check-List as extending to " eastern Nebraska and Kansas " 

 and it would seem that it is still further extending its range to the west- 

 ward as a pair of typical specimens were collected on Dry Willow Creek, 

 Yuma County, on Aug. 19, 1915, (C. M. N. H. Nos. 4760 and 4787) form- 

 ing the first and second records for Colorado. 



Loxia leucoptera. White-winged Crossbill. These birds have 

 been reported on previous occasions from Colorado but investigation has 

 failed to show wherein any of these occurrences have been based on speci- 

 mens actually collected and preserved. An adult male (C. M. N. H. No. 

 6585) collected at Silver Lake, Boulder County, on May 17, 1917, is there- 

 fore, apparently the first record specimen. 



Spizella p. arenacea. Western Field Sparrow. The first record 

 specimen of this subspecies for Colorado is an example (C. M. N. H. No. 

 6142) taken in the vicinity of Holly, Prowers County, Sept. 21, 1916. It 

 is an immature female and when secured was associated with a mixed flock 

 of S. pallida and S. breweri. 



Passerella i. iliaca. Fox Sparrow. The occurrence of this bird in 

 the Clear Creek Valley within a few miles of the foothills near Golden, 

 Jefferson County, was most unexpected. The specimen, an adult male 

 (C. M. N. H. No. 6016) was secured Nov. 1, 1916. 



Helinaia swainsoni. Swainson's Warbler. The presence of Swain- 

 son's Warbler in Colorado is decidedly unique and extends the possible 

 range of the species several hundred miles to the westward. The speci- 

 men forming the record, is an adult female (C. M. N. H. No. 2806) and was 

 secured near Holly, Prowers County, on May 12, 1913, from a dense growth 

 of willows, frequented at that time, by numbers of Bell's Vireos. 



