xviii Birds of Colorado 



Arenaria i. morinella, Lophortyx gambeli, Pedioccetes 

 p. columhianus, Melopelia asiatica, Elanoides forficatus, 

 Ictinia mississippiensis, Astur a. striatulus, Buteo b. 

 harlani, Strix varia (breeding ?), 8. occidentalis, Crypto- 

 glaux f. richardsoni, Conuropsis carolinensis (extinct), 

 Coccyzus eryihropthalmus, Dryohates villosus, Phlceotomvs 

 p. abieticola, Centurus carolinus, Colaptes a. luteus 

 Antrostomus vociferans, Phalcenoptilus n. nitidus, 

 Chordeiles a. texensis, Stellula calliope, Myiarchus I. 

 oUvascens, Sayornis phcebe, Myiochanes virens, Empidonax 

 t. alnorum, E. griseus, Otocoris a. euthymia, Agelaius 

 tricolor, Carpodacus purpureus, Loxia leucoptera, 

 Acanthis I. rostrata, Astragalinus p. mexicanus, Ammo- 

 dramus lecontei, Zonotrichia querula, Z. coronata, Z. 

 albicollis, Spizella pusilla arenacea, Junco dorsalis, Aimo- 

 philav. scottii, Melospiza melodia, M. georgiana, Passerella 

 i. schisfacea, Pipilo aberti, Cardinalis cardinalis, Passerina 

 cyanea, Pyranga erythromelas, Pyranga r. cooperi, 

 Lanivireo s. cassini, Vireo vicinior, Mniotilta varia, 

 Protonotaria citrea, Vermivora chrysoptera, Compso- 

 thlypis a. usnece, Dendroica ccerulescens, D. magnolia, 

 D. cerulea, D. striata, D. virens, D. palmarum, Seiurus 

 aurocapillus, Oporornis agilis, Wilsonia pusilla, W. 

 canadensis, Nannus hiemalis, Cistothorus stellaris, 

 Hylociclila mustelina, Saxicola cenanthe. 



The vertical distribution of the Colorado birds has 

 occupied the attention of many observers ; Mr. F. M. 

 Drew published in the Auk in 18S5 a complete list of 

 Colorado birds, as then known, with their vertical dis- 

 tribution both in the breeding season and at other times. 

 I have confined myself to an analysis of the vertical 

 distribution during the breeding season, as the data for 

 more detailed study are still very imperfect. In addition 

 to this, storms and accidents of various kinds may often 



