300 [Dec, 1S45. 



cleft. The posterior impressions are each about the size of a 

 walnut. The interval between each foot mark is about 2g feet 

 in the larger, and 18 inches in the smaller. 



Besides these, and a few others which are identical or nearly 

 so with some which I have already described on a former occa- 

 sion, there are four or five huge imprints of a still more remarka- 

 ble character than any that have heretofore met my eye. They 

 are in a continuous line: each imprint is 13 inches long, and 9 

 wide. The toes, which are five in number, are thick and very 

 perfect. Four of these imprints are quite perfect, others are less 

 so, and many are nearly obliterated. The average distance be- 

 tween each impression is 3 feet 7 inches, with the exception of 

 the last two, which are seven feet apart. This seems to indicate 

 that there was once a track between these two, which has been 

 defaced by the erosive action of the elements upon the rock during 

 a series of ages. 



The Committee on Mr. Edward Harris' description of a 

 new species of Parus from Missouri, read at last meeting, re- 

 ported in favour of publication. 



Description of a new species of Parus from the Upper Missouri. 

 By Edward Hakris. 



Parus sepicntrionalis. Young, in summer plumage. 



Bill brownish black, short and stout. Iris dark brown. Feet greyish 

 blue. Upper part of the head, chin and foreneck dull black; the black of 

 the head scarcely descending to the hindneck, and that on the foreneck 

 hardly reaching to the breast. Cheeks and sides of the neck, a line running 

 from the base of the bill under the eye and almost meeting on the hindneck, 

 white. Back greyish, slightly tinged with yellow. Quills and tail feathers 

 dark greyish brown, margined with pure white; secondaries conspicuously 

 so. Lower parts greyish white with an almost imperceptible tinge of yel- 

 lowish under the wings. 



Length 5f. Wing 211. Tail 3 H inches. 



A single specimen of this bird was procured on the 26th of July, on the 

 Yellow Stone River, about thirty miles above its junction with the Missouri. 

 It is evidently a bird of the season, with immature plumage, to which may 

 be attributed the dulness of the black on the head and throat. On com- 

 parison of this bird with P. Carolinensis and P. atricapillus, it will be per- 

 ceived that, beginning with the smallest bird, the parts which are black, de- 



