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Sept., 1919 A NEW SUBSPB, CIB, S OF PIPILO FUSCUS 211 also paler and less uniform, i.e., distinctly lighter posteriorly, and the crissnm 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 Bay, 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, i905, 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 fuscuz 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 albigulus; while those from Yubay, Lower California, 30 miles southeast of Calamahu?, 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 fu?cus. 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 PIPIO FU$CU$ .4RIPO1U$ ALL TAKEN IN LOWER CALIFORNIA BY E. W. NELSON AND E. A. GOLDMAN 196603 196609 196602 196605 196606 196607 196604 196608 [g] [g] Locality San Pablo Guajademi Santa Rosalia Bay San Pablo San Pablo San Pablo San Pablo 25 miles east of San Ignacio Date Oct. 3,. 1905 Oct. 31, 1905 ' Sept. 25, 1905 Oct. 3, 1905 Oct. 3, 1905 Oct. 3, 1905 Oct. 3, 1905 Oct. 19, 1905 92 105 88.5 103 91 07.5 92.5 05 87.5 ?1.5 81 96.5 88 O0 85 99.5 14.5 26.5 14.8 24 14.8 25.5 15 26 14.2 25.5 15 26' 14 26 14 26 18 18.5 17 18.5 18 17 17 18.8 Washington, D.C., May 31, 1919.