1{KI>S (^F THE OREGON DESERT. 
. , , known as Aichmophoriis occide^itahs and 
n^U.pso<ndentan,^ „une including parts of the superior 
1 find m especially perfect specimen of its tibio-tarsus in 
inaii.lible ttiul J'*"- particulars with an example of the 
I ring v«rv «,n,e>vl„a In length, but the major, y of the specm^is 
»r “ ,,ic«l. I lhnn.1 .... hn...er,.. ..nite ,n, large ,.B that hone ... the ex.et...g ^c.e., 
Im. .l.L.«.a. ..u. ». very ...n..y exn.,.ple. of It h. the collect.on, .....I p.-„h«l.l.v no 
l.n,.T were- neenml. I.. the f..».ll bird too, the d.stnl margm of tl.e nh.ar 
cn"t, or that loonier l>oui.di.ig the fossa wherein the pneumatic foramina are found 
in other hirtln which imisbchh pneumatic humeri, is rather fuller than it is in the 
l.ninerus of t he existing sia-cies. This very slight difference appears tn Ije constant. 
Another Cnda* whicli is also (,uite abundantly represented by its fossil remains 
is Colpubus hoibitlli, and it upi>ears to lx* identical with the existing siiecies Ixaring 
tlmt nnnie. It is a notably smaller species than yE. occidetitalis, and its fossil 
rt'inains an* easily distinguished from it. 
Nninenms Ismes of Colytnbns nigricollis californicus were also found, and in 
tin* cnM' of the long Isnies of the ja'ctoral limbs of this Grelie, it required esiiecial 
cnn- to distinguish them fnuii the corresponding ones of the fossil .specimens of 
J'oddynibus p<hiiceps. They are nearly of a size, but I had ample material Ix'fore 
me for roinparison. As 1 have just intimated, the Pied-billed Grebe {Podilymbus 
poiH(eps) nlm» ligiinsi in the ancient avifauna of Silver Lake, and the sjmcies pmba- 
hlv ngnssl iihnost exactly with the form we have with us at the pre.sent time. Four 
humeri (two |M>rfe<'t), tlm>e ulnas, two coracoid-s, and two tibio-tarsi and other bones 
tif the fossil s|Mt'i«<s which 1 have sek*cted agree in all particulars with the corivs- 
|sinding Imhicm of a s|x*cimen of Jhidilymbus in my ow'ii collection, obtained by me a 
niimlN’r of years ago. There still nunain a few fossil Grebe bones in the collection, 
but. fn»m tin* lack of material, I cannot at present be certain as to the species 
to which they Udoiig. They consist of the proximal third of a humerus; three 
tansMiietatnrsi (two ixrfwt) ; an up 2 H*r mandible, and a coracoid. They are consid- 
erably lan?er than the corivsixjmling Iwnes in any of the smaller CIixdx?s. and far 
t.«) small for C. holbitlli. Moreover their characters are entirely different. Two 
ortho tanavn.etatarsi ami the coracoid from their color and characters apixar to 
have Is-longjMl to tl.e same individual ; but possibly the specimen was subadult. I 
command, but I am inclined to 
merv n .1 ‘‘‘"T- .’""J ^ the sjx^cies with a 
«I»ery III the suhjoiiuil list. ^ 
wll'lmvh.r’ "'‘.''T-' '•'•“"S' •» '"-y, of a,.y Bi«.cles of Loo.. (CV.W- 
lond^\ liaMi.g existed in the former fauna of the - ^ ^ 
entirely abM-iit from the collection. 
region, and their fossil bones are 
wo have 
•''' avirau..a .vhlcl. 
