155 UNIVERSITY OF COLORADO STUDIES 



Nycticorax nycticorax naevius, Black-crowned Night Heron (202) 



Summer resident; common along the creeks and reservoirs of the Plains zone. 

 No large colonies have been reported. Arrives, April 7(1 record) ; leaves, Sep- 

 tember 15-25 (3 records). 



Order PALUDICOLAE, Cranes, Rails, etc. 

 Suborder Grues, Cranes, etc. 



Family GRUIDAE, The Cranes 

 Grus canadensis, Little Brown Crane (205) 



Felger (Auk, Vol. XXVI) records a specimen taken by A. T. Allen near 

 Boulder in March, 1901. There are not many records for Colorado. 

 [Grus mexicana, Sandhill Crane (206)] 



On March 31, 1912, a flock of about 40 cranes (probably this species) was 

 seen by the writer. It is regarded as of regular occurrence in migration at the 

 Barr Lakes. 



Suborder Ralli, Rails, Coots, etc. 



Family RALLIDAE, The Rails, Coots, etc. 

 Rallus virginianus, Virginia Rail (212) 



Permanent resident; common as a summer resident of the marshes of the 

 Plains zone. At least a few winter regularly in some of the marshes where open 

 water is found among the cat-tails. Nesting dates are: eggs May 28, 1904 (Rock- 

 well) ; June 7, 1904 (Bragg) ; downy young May 14, 1910, and August 6, 191 1 (the 

 writer). 



Porzana Carolina, Sora (214) 



Summer resident ; common in the marshes of the Plains zone and infrequent 

 in the marshes of the Yellow Pine zone. It has been observed from May 8 to 

 October 22. A pair was observed at 9,500 feet June 28, 1889, by Gale, and the 

 writer found a nest with five eggs at 8,500 feet, July 4, 1910. The nesting dates 

 on the Plains run from May 25 to June 12 (3 records). Felger found a dead 

 specimen on Arapahoe Glacier (about 12,500 feet) September 2, 1903. Widmann 

 saw one at 9,000 feet near Estes Park on July 9, 1910. 



Fulica americana, Coot (221) 



Summer resident ; abundant as a migrant and infrequent as a summer resident 

 on the ponds of the Plains zone. Arrives, April 3-5 (2 records); leaves, October 

 19 — November 10 (2records). Gale found eggs June 19, 1890, probably just north 

 of the county; young birds were seen by the writer June 30, 1912, near Gunbarrel 

 Hill. 



