x LIST OF ILLUSTRATIONS. 
ACCOMPANYING Dr. R. W. SHUFELDT’S REPORT. 
Page 
Fic. 1.—Speotyto cunicularia hypogea -.-----.-------- e2e--+ e- +2 +--+ - =e 593 
2.—Speotyto cunicularia hypogea -.----..----- -2-- eeenee --2- ween ee -- == 594 
3.—Head of Eremophila alpestris ....-- seal ay cee tee BAA Seon OBO Gaae 628 
4,—Centrocercus urophasianus..-. .----- 22+ e----- eee e ee eo = eee - 656 
5.—Canace obscura.----. --- 22. eons oe ene eon oon econ ne meee eee e ne eee ene 655 
6.—Canace ODSCULa---- -2 26 enn e on = ewes woe ce ono = een ne on we nnn == 656 
7.—Cupidonia cupido...-....---. .-2-22 -- 6+ -- enon ee ene eo eens eee ene 
8.—Cupidonia cupido.... ..---- 2-06 eee eee eee nee moe wen enn ne cone cen nne 669 
@)——Isomacey wumalll, 364 coed aoeoos Sob h60 codon Sacaes ceaboe saBDOS asbes0 Be) Sy 
10.—Bonasa umbella -..---. ---. 22-22. ween ee ooo o ne ooo ee ee ene een wenn 660 
11.—Centrocercus urophasianus.......-.------- ---- -2------ ---- ---- ---- = 672 
12.—Pedizcetes phasianellus ......---.---.----6- ----- Dod GooESe maps Sodos 678 
13.—Pedizxcetes phasianellus ....-.-.-.-----2 ------ + ~~ -- 2 = ooo - =e 684 
14.—Lagopus albus .... .--.-. ------ e222 Foon ne oe nnn oe nee eee ee enn nee = 688 
15.—Ortyx virginiana .----- ..---- 22 enn - enn woe se nee eee ene Sage cooc 693 
1G —Orainyxs {GH o56 eooco0soco6 be6d 6 cq5beb bon6 Gado aeos 65000086 So50G5 GcOs 695 
17.—Callipepla squamata......----.------ ---- ---- 2222 cece eee eee eee cee 697 
18.—Lophortyx californica .....-. .----- S000 605 cos600 60 oo ooso ods odoe 698 
1). OWaeiromnyax, WARING). oS 666 ooo agb6se So sase coocde coooce chen Secsed asec 700 
20.—Pseudogryphus californianus (facing page)...--..----------------.- tod 
21.—Pseudogryphus californianus...... J.---2.----. .---------- == ene 730 
22.—Cathartes burrovianus.... ..-. 22. 2 oo 22 none coe ce wens ones wenn 2 > 393 
OBL ORMIMENUES BUNS 549 SoG665 6500 pdodes Goosod DoGacs cooSen Soe ialelaraeinateiate 733 
Oil ——(OenIagIIStR) GYRE) 6555 co dod0 cobG6 066 6o55 GeoRebboES dogses SeoSoecoT 733 
25. — CRN ATHIES AMD oo6bc5 chon ob5ond cooHds sooado cobesb NSdOO GosEse Soc5c0 742 
20: Cabbarisharalavaeeeaemecseiiseeeines eeiste sinter eeiactertectecieetseia= ae mmmnat cD 
2/.—Pseudosryphus califormianus .----. =... 2.26 cose Soc none coc eee anne 749 
28.—Pygostyles of Vultures and Hawks......- Be AE ee ENN Nets 1 761 
29.—Ribs of Cathartide and Walconida.... ....---. 2-222 cone cone cone coe 763 
30!—Coracoid of Pseudosryphus)sas.ieee emis oe els asie eee nisin aleeeieiee eer 766 
Slr Cathanistaratra tas soce sees oclae ae cseiae seco caseieescte een eee eee 767 
32. NeCOphronspercuoplrenusys json ese eeeeesclenie seal Sameer aiciee SEES eG 767 
Soh Onbyonis lnm OMI) 855 Gop dco b ee asda ss coUHoG choo boooao ode desc open’ WEF 
34: Cathartes aura soos se acse etc ce te asvseci cece mine ceicclne cia sia neni erate V7 
3 OHI NPR ENE Soooos SooreE rene ub be Gso0 Cobo Seca beobeeoseduoseacapes |. ail 
36: Cabharbes aura ooo 2 SUE ce See ee ee eee Swi oleae) arene W71 
Sas Oathartes aura ose so. kee coe ese ea ee Se eee 772 
30:-— Catharishal alata ise ciecse de cone cel sleeps stot wise see seonse toe sees 772 
39:—Capharistaatrata sass. . csosoniece cence: Ce aS tS NS URL a ea a 777 
40; Pseudocnyphus caltorlanusessceee eer eee eee ee eee eee eee eee 780 
4 Pseudosryphus) calitornianusye. cesses acjecccceiees acess cae cece eee 782 
Facing page. 
PLATE I.—Skeleton of Speotyto cunicularia hypogea-.........--.------ 622 
II.—Osteology of Speotyto cunicularia hypogea .......----..- cee) G24 
III.—Osteology of Speotyto cunicularia hypogea ..---..----.------ 626 
IV.—Osteology of Eremophila alpestris ....-...------------------- 652 
V.—Osteology of American Tetraonidsw..---..--......-..---.----- 702 
ViI.—Osteology of American Tetraonide.........-..----- edicieeieee 704 
VII.—Osteology of American Tetraonida@....--..2---------.---- o--6 706 
VIII-—Osteology of American Metraonids: -22 2252-2222 asses 708 
IX.—Osteology of American Tetraonid@....-....--...---..-------- 710 
XK.—Osteology of American Tetraonid@...--.....-.. ---.---------0 712 
xi — Skeleton! of American Netraonida----.----2 -foa22 s2eee. eeeeee 714 
XII.—Skeleton of American Tetraonide .-.........---2..----------- 716 
XIil.—Skeleton of American Tetraonidw.-.-....-....-...-2c2-. --<-- sg efits 
XIV.—Osteology of Lanius ludovicianus excubitorides .......-...-.- 726 
XVi—Osteolosy ofthe Cathartideores ses ssececee sees cs ee eee eee 788 
NVile—Osteolonyiot the) Cabharbideossee ssa ane He ees eee a 790 
xv lIe— Osteolosy, of the Cathartidws. 22.2542 54eee eee eee 792 
XVIIT.—Osteology of the Cathartide.................-..------ eee od 
xix —Osteology, of the Cathartida-<)o sea ss5-ee cee cee one eee ee 796 
xexe— Osteology of phe) Cathartideaese ssc saee seen ee ee mae mean 798 
XXkT.—Osteology of the Cathartides..-. 2.22 s.-. ---- --- 2 oo eee cece 800 
XXII.—Osteology of the Cathartide......-. 2.2... 2-2-2. eee ee ene eee - 802 
XX ——Osteolosy of Huei Cathartideass2n> soe ese e eer oe ean ae 804 
XXIV. —Osteology. of the: Cathartide: 222.255.2225 2 ee ae 806 
