Shufeldt: Birds from Bermuda. 351 



skull of the former was not cut away as extensively as it was in the 

 male, and therefore was not left as short. For all practical purposes, 

 the ulna measures in length a little over nine and a half centimeters, 

 and the tarso-metatarsus rather more than three and a half centi- 

 meters in either the male or the female bird of Mstrelata caribbcea. 



The specimen I examined of Mstrclata hasitata also had two labels, 

 both being alike. On the obverse side we find: " Mstrelata hasitata 

 ad., No. 152522. Near Winchester, Virginia, Dr. W. F. Hutchin- 

 son"; on the reverse side: "Last of August, 1893. One of a pair 

 (J'' and 5) picked up near Winchester, Va., after an eastern storm. 

 They were in an exhausted condition." 



In this specimen the proximal third of the left ulna is not present. 

 There are glass eyes in the orbits. The right ulna has a length of 

 1 1. 1 5 cms.; the right carpo-metacarpus 4.25 cms. (approx.) ; and the 

 right tarso-metatarsus 4.0 cms. 



The lengths of these various bones will be taken up again further 

 on in the present article, when I come to compare them with the corre- 

 sponding bones in the several lots of the Bermuda specimens at hand. 



It will be advisable, in the first place, to critically examine the 

 recent material I have before me for comparison with the Bermuda 

 specimens, in that it may, at the outstart, be decided which part of it 

 will be of assistance and which will not. 



I shall take up first the stermims, shoulder-girdle, and costal ribs 

 or haemapophyses of the specimen of Puffinus obscurus, loaned me by 

 Mr. C. J. Maynard, and referred to by him in his letter of Septem- 

 ber 17, 191 5 (see antca). There should be no question about the 

 identification here, and Mr. Maynard has the skin of the bird in his 

 private collection. He admits in his letter that it is an Audubon's 

 Shearwater — that is, Puffinus Ihenninicri. This sternum and pectoral 

 arcli are shown on Plate XXII, fig. 33, and on Plate XXIII, fig. 34, and 

 it is. except in one instance, very unlike any sternum or pectoral arch 

 to be found in the Bermuda specimens. None of the latter, therefore, 

 represent Audubon's Shearwater (Puffinus Iherminieri). With re- 

 spect to the excepted specimen, this latter is here figured on Plate 

 XXII, fig. 29, and on Plate XXIII, fig. 36. This subfossil specimen from 

 Bermuda, which I find in the collection of Mr. McGall, is the sternum 

 of a Puffinus larger than P. Iherminieri, and I shall describe it further 

 on in the p'"f'';ent contribution. 



