sept., 1919 A NEW SUBSPECIES OF PIPILO FUSCUS 78 | 
also paler and less uniform, i. e., distinctly lighter posteriorly, and the crissum 
averages paler. While Pipilo fuscus aripolius is intermediate between Pipilo 
fuscus senicula and Pipilo fuscus albigulus, it is more grayish than either, and 
has other good characters of its own; furthermore, it occupies a distinct geo- 
graphic area, over which it is fairly uniform. There is comparatively little in- 
dividual variation in the series that we have examined. An example from 
Santa Rosalia Gay, Lower California (no. 196602, U. S. Nat. Mus.) taken April 
25, 1905, is intermediate between this new race and Pipilo fuscus senicula, but 
is apparently nearer the former. A specimen (no. 196609, U. S. Nat. Mus.) 
from Guajademi, Lower California, taken October 31, 1905, verges strongly to- 
ward Pipilo fuscus albigulus, but its grayness and darkness both above and be- 
low, together with its other characters, place it with Pipilo fuscus aripolius. 
Birds from the Rancho Santo Domingo, Lower California, 25 miles south of San 
Jorge at about 25° 25’ north latitude, are also somewhat intermediate but are 
clearly referable to Pipilo fuscus albiguius; while those from Yubay, Lower 
California, 30 miles southeast of Calamahué, at about 29° 15’ north latitude, 
though likewise intermediate, are referable to Pipilo fuscus senicula. 
This new form is of considerable interest since it establishes direct and 
complete liaison in both geographic distribution and in characters between 
Pipilo fuscus senicula and Pipilo fuscus albigulus, and shows clearly that these 
birds, commonly regarded as distinct species, are but sub-specifically related. 
Since Pipilo fuscus albigulus intergrades individually with Pipilo fuscus meso- 
leucus of northwestern Mexico and Arizona, it follows that Pipilo crissalis and 
its races are all subspecies of Pipilo fuscus. 
By the separation of this new race the geographic distribution of Pipilo 
fuscus albigulus becomes restricted more closely to the southern part of the 
peninsula of Lower California, ranging from Cape San Lucas north to about 
25° 25’ north latitude. 
The table given below shows the locality as well as the detailed measure- 
ments of all the specimens of Pipilo fuscus aripolius examined. 
SPECIMENS OF PIPILO FUSCUS ARIPOLIUS ALL TAKEN IN LOWER CALIFORNIA 
BY E. W. NELSON AND E. A. GOLDMAN 
~., = 
oe De n De 
Bis Locality Date bD a a > let © 
ad | | So Se Be |e sak 
pS D 3 5 a ao | a |SES 
196603 | é | San Pablo Oct. 3, 92 | 105 | 14.5 | 26.5 | 18 
1905 | 
196609 | @ | Guajademi | Oct. 31, 88.5 | 103 | 14.8 | 24 | 18.5 
2G 1905 
196602 | $ | Santa Rosalia Bay Sept. 25, Gr | 107S) | Ja 25-5 | 17 
1905 
196605 | @ | San Pablo Oct. 3, A 9235 (05) | abe $26: 7] 285 
| | 1905 
196606 | @ | San Pablo Oct. 3, 87.5 | 101.5 | 14.2 | 25.5 | 18 
1905 | : 
196607 | @ | San Pablo Oct. 3, | 81 | 96.5 | 15 | 26 | 17 
| 1905 | 
196604 | [2] | San Pablo Oct. 3, ese s a00e" Pde. | 26 . far 
1905 
196608 | [2] | 25 miles east of San | Oct. 19, | 85 99.5 | 14 | 26 | 18.8 
| | Ignacio | 1905 | | | | 
Washington, D. ae May 31, 1919. 
