Puffinus Lherminieri dichrous Finsch and Hartlaub
Puffinus dichrous Finsch and Hartlaub, 1867, 'Faun. Centr. Polyn.,' p. 244
(McKean Island, Phoenix Group).
?Puffinus opisthomelas var. minor Hartlaub, 1867, Proc. Zool. Soc. Lond. (Pelew
Islands).
SUBSPECIFIC CHARACTERS.-Similar to Puffinus Iherminieri polynesia, but with a
shorter bill (shortest of the species).
TYPE.-Sex undetermined, McKean Island, in the Zoological Museum of Berlin.
RANGE.-Western equatorial Pacific, from the Phoenix to the Pelew Groups.
MEASUREMENTS (17 e and 9, including the type, from McKean, Canton, and
Enderbury Islands; Phoenix Group, and from Ponap6, Nauru, "Carolines," and
"Pelews." 56 adults measured for length of culmen).-Wing, 188-209 (202); tail,
73-84 (80.2); exposed culmen, 22.6-27 (26); depth of closed bill at base, 8.5-9.2;
least depth of bill, 5.5-6; width of bill at base, 9-11.2; tarsus, 36-40 (38.2); middle
toe with claw, 39-43 (40.8) mm.
The names dichrous and minor were published during the same year, 1867, and it is uncertain which has priority. The fact that Puffinus dichrous was accompanied by a detailed description, while minor is not even certainly applicable to a shearwater of this type, should, however, leave no doubt regarding the superior claims of the former name.
Through the courtesy of Dr. Irwin Stresemann, the writer has had an opportunity of examining the type, together with other specimens in the Berlin Museum from Nauru and the Pelews. These, as well as American Museum skins from the Caroline Islands, all seem to be identical with birds of a large series collected by Mr. J. G. Correia of the
Whitney South Sea Expedition, at Canton and Enderbury Islands, Phoenix Group, on March 11 and 19, respectively, 1924. The latter were adults on their breeding grounds, with gonads in various stages of enlargement. Many were molting the quills of wing and tail. The colors of fleshy parts in life were as in other members of Iherminieri. Except for the remarkably short bill, the specimens resemble P. 1. polynesiae, although the dark plumage on the sides of the pectoral region in dichrous seems to be more broken on the average, scattered feathers sometimes mottling the breast almost to the mid-line.
(Murphy 1927)
http://digitallibrary.amnh.org/dspa...ace/ingest/pdfSource/nov/N0276.pdf?sequence=1 .
Ross Silcock webpages:
Pacific Ocean taxondichrous (polynesiae was considered weakly differentiated from dichrous). Austin et al (2004) did not treat the taxa gunax, bannermani, or heinrothi; gunax is treated as a subspecies of dichrous here. The taxon subalaris is considered a full species, Galapagos Shearwater (see above).
Of interest are comments by Scofield made prior to publication of Austin et al (2004; pers. comm. Angus Wilson); Scofield said "One could argue that what we have here are a subantarctic species, the true Little (as exemplified by elegans) and a true Audubon's (as exemplified by lherminieri) that have a lot of intermediate "hybrid" populations. I suspect that DNA work will make many of the more northern Little Shearwaters into blue-footed Audubon's."
P. b. dichrous (incl polynesiae Baker 1951; dichrous has recently been referred to as "Atoll Shearwater", implying specific status, Howell)
Unless the old specific name, obscuras of Gmelin, is revived, the name for the entire group in Micronesia and Polynesia would be P. I. dichrous. (Baker 1951)
On a Collection of Birds from some less-known Localities
in the Western Pacific. By Dr. G. Hartlaub.
The collectors of Mr. Johann Caesar Godeffroy of Hamburg have
of late touched at some localities not before explored by scientific
expeditions. These localities are the Pelew or Palaos group
(Western Caroline Islands), the Matelotas with the Island of Yap,
the more northern Mackenzie Islands, and the Echiquier or Bou
gainville group near the northern coast of New Guinea. The col
lection contains twenty-three species, four of which are very pro-
bably new, and will pro\ e an interesting addition to our knowledge
of oceanic ornithology.
23. PuFFiNUs opisthomelas, Coues.
Four specimens from the Pelew Islands. " Kokeio" incol.
Var. minor : subcaudalibus totis niyro-fnliginosis.
The type of Coues's description from Cape St. Lucas is a some-
what larger bird ; but, there being no other difference between it
and our Pelew bird, I prefer considering this latter a smaller race.
The dimensions of our specimens are: — Long, tota Il-IH", rectr.
12-121"', alse 3" 4-7"', tars. 17".