BIRDS OF COLORADO. 
43 
dias, grus amei'icana, r alius virginianus, recurvirostra americana^ 
gallinago delicata^ trmga maculata, numenius longirosti'is, bubo vir- 
ginianus subarcticus, geococcyx calif ornianus ^ dryobates pubescens 
ho7fiorus, sphyrapicus varius, tyrannus vociferans^ ^nyiarchus cineras- 
ce?ts, empidonax traillii, otocoris leucolcema, corvus cryptoleucus, corvus 
americanus, cyanocephalus cyanocephalus, coccothraustes vespertina, 
leucosticte tephrocotis^ zonotrichia leucophrys intermedia, spizella mon~ 
ticola ochracea, spizella srcialis, junco aikeni, junco hye7nalis^ junco 
hye7nalis connectens, junco 7neav7tsi, pipilo maculatus arcticus, pipilo 
fuscus 7nesoleucus^ clivicola riparia, a7npelis garrulus, a77ipelis cedro- 
ru7n, lanius borealis, helmmthophila virgmice, helminthophila celata^ 
compsothlypis americana, dendroica corofiata, de7tdroica rdgrescens, 
geoihlypis trichas occidentalis, cistothorus palustris paludicola, parus 
inornatus g7'iseus, psaltripariis plmnbeus^ regidiis satrapa, sialia sialis. 
1873 . . Aiken. Am. Nat. VII. 1873 , /j, Mr. Aiken records 
here a7n7nodra7nus bairdi for Colorado. 
1873 . Ridgway. Bidl. Essex Inst. Nov. 1873 , ijg. This is 
one of the most important and, at the same time, one of the 
most unsatisfactory publications ever issued concerning Colo- 
rado birds. It gives a list of 243 species known to occur in 
Colorado, of which 59 had never before been credited to the 
State. The list is entirely a compilation and much of it from 
manuscript notes of various persons and collections, yet, for 
the most of these species, no source of authority is given ; 
for several the source is given incorrectly, and for some it is 
impossible at this day to ascertain the basis for including them 
in the list. The list is based largely on the records of Mr. Aiken, 
and to him belongs most of the credit for the notes on distribu- 
tion during the breeding season. Many of the species are 
included on the authority of Mr. Henshaw who had lately taken 
them and allowed of their publication here in advance of his 
own notice that appeared at a later date. Several of the rarer 
species owe a place in the list to their occurrence in the Maxwell 
collection, a complete list of which was not published until 
1877 . And, as stated above, there are some species whose source 
cannot be now ascertained. The following species appear in 
this list for the first time ; those marked with one star having 
been taken by Mr. Aiken, those with two stars by Mr. Henshaw, 
and those with the asterisk are in the Maxwell Collection. 
Coly7nbus nigricollis calif or7iicus^ \ podilymbus podiceps^ '\uri- 
nator imber.^ \larus delawarensis^ sterTia forsteri^ ^ pelecanus 
erythrorhynchos., '\merganser america7uis^ '\lophodytes cuculla- 
tus., "^aTias obscura^ aythya marila 7iearctica.^ \branta canadefisisy 
olor buccinator^ \plegadis guar attna^ \ardea candidissima^ \por- 
zana Carolina.^ '^'^fulica americana., '\stega7topus tricolor^ "^"^tringa 
bairdii., ^tringa alpina pacifica., ereimetes pusillus., sy77iphe77iia 
