74 



ihem, using for the purpose three foreign specimens from his own 

 cabinet, and the one under consideration. He found the measure- 

 ments to be as follows : 



Measurements. 



N. American I European 

 specimen. | specimen. 



Length of bill along the gape, . 

 Diameter of bill from above downwards 



directly in front of nasal depression, 

 From middle of nostril to end of bill, 

 Horizontal diameter of bill at nostrils, . 

 From bifurcation of rami to tip of lower 



mandible, 



Wing, from flexure to tip, . 



Length of tarsus, 



Length of tail, ..... 

 Average length, according to Aud. & Temm. 



inches. 



L75 



.55 



L12 



.45 



.85 



8.25 



L85 



10.75 



18.50 



inches. 



1.56 



.56 



1.06 



.50 



.75 



7.62 



1.85 



10.00 



18.00 



The 5th primary is longest in the American, the 4th and 5th 

 in the European. The white markings on the inside of the 

 primaries are much less distinct in the American than in the 

 European specimens, and the green color on the wings is more 

 prevalent. Although he would not assert that he considered 

 these differences sufficient to constitute the American bird a dis- 

 tinct species. Dr. Cabot believed there was better cause for so 

 doing than in the case of Corvus corone of the United States, 

 which Mr. Audubon had described as distinct from Corvus corone 

 of Europe, under the name of Corvus americanus. 



Dr. Cabot also exhibited, and read a description of, a new 

 species of Humming-bird. 



He stated that he had examined all the books to which he 

 could get access, without finding any description of this bird ; but 

 thought it probable that it might be among the many species 

 lately described in periodical publications which he had not seen. 



TiiocHiLUS YUCATANENSis. Length 4 inches. Bill f of an inch. 

 First primary longest ; primaries curved, broadest at their tips. 

 Tail, somewhat forked, rather more than 1 J inch long, consists of 

 iO feathers. Bill light yellowish at base and along centre of man- 



