K,^UL-S HKUS of the OREGON DESERT.' 
or.-.-... : 
I'tWOC-rTia. I-HAMASKIXIH tOI.LMlUANUS. .11, 1 
V ,.„.n..T ..r tlK. I«.n- <.f tl.elin.ta and a nght coraco.d, all more or lees 
„.rr.;' a .I.e |.n*-i.ce. of this six^eie. of Grou^ .a the same geologrcal forma. 
•m ^ .1 • Im... a. I of the opiaion that both species were qmte abundant 
^.,7 iK- 1....^ terliary K-riod of the west. Osteological y, these fossil tae, 
raiZ l» .li.lii,gni.lnal fn..n those of the e.visting species, of which latter I have 
M'VfrnI ••kflftoiiM in n»y |M>«»eKAioii. 
(•o|M? c*»Ilfcti»M : Ik'ds of Oregon. 
i-fc’AM •(>. nov. 
Vn .-xtiiH-t, ninl at the wune time ii larger and heavier Pedioccetes than any 
..iMvie* of III.- gfiiuH now e.xiHting in our avifauna. Represented by three uhue, two 
tihi.i.tnn.i, iiiul a tarao-nietutannia,— some of the specimens being nearly perfect. 
(MK.A.SfHKMKXTS IN MILI.IMKTRES). 
1 
; P. p. columbiaiius 
i 
• P. lucasi 
Lrti«.li iiC ultts . . . . 
60 
Go 
|.rn(.li larBi>-nM-.slBrMiii 
42 
44 
.\»« fnr III* iny material goea to show, the two species w'ere in their osteological 
rlwiniet.-n. eioM-iitially th.- saiiu-, but the several bones compared are in P. lucasi 
ninrke4lly stouter witli their extremities more powerfully developed. For instance 
the gn-nlesi triiiisvers.- diameter of the distal end of the tarso-metatarsus in P.p. 
.dumhhtuMS measures hut D mill, while in P. htcasi the same diameter measures 11 
inin. niid this relative pn)|M>rtion is 8u.stained for the ends of all the other long 
iMiites. I III- shaft of the tarso-metatarsus in the existing species is rather inclined 
III U- slender. — ill I\ lucas$ it is very jH-rceptibly stouter and stronger. These dif- 
fen mvs w.-n- um|uestionahIy exteiuled to other parts of the skeleton of the e.xtiiict 
s|s-oies, resulting in the eonsiderably larger form which it undoubtedly was. 
Tyis- a iM-rf.-et right ulna, 1*1. XVII, fig. 30. 
I take pleasun. in dedicating this species to Mr. F. A. Lucas of the Depart- 
ment of r«u,,M.rative Anat.imy of the U. 8. National Museum, in recognition of his 
laililislusl Inisirs m avian iwteology, and his past and present Museum work, both 
III |inl*<oiitology and avian ost.-ology. 
Ksiuiis I kils, Oregon : ro|)c‘ collection. 
|•|:l•ll* I TIJ. XJ.KCS up. linr. 
..f siJ. H.rs sisH^r^ ■ n ^nd P. lucasi only in the matter 
cel^riica consideration does not 
t" a. ^-o extinct forms are in both />. 
th. pn.s..ut s,K-cnes stouter, with more strongly developed exti-emities 
