NATURAL SCIENCES OF PHILADELPHIA. 551 



No. 3 is from " Holland's Cliffs," three miles south of " Lower Marlboro 1 ' 

 and is thirty feet thick. 



No. 4 is from the " Cove," on the south side of Herring Bay, eight miles 

 east of Nos. 1 and 2, 



Prof. Tyson has traced this " Tripoli region " from near the head of West 

 River, in Anne Anindel County, twenty-five miles southward, to Prince Frederick, 

 in Clavert County, It may be found to extend eighteen or twenty miles further 

 south, to near the lower end of Calvert County. It is well exposed in high 

 cliffs on the Patuxent, as well as on the Chesapeake Bay. It probably extends 

 over most of Charles County, and of the southern part of Prince George County. 



It belongs to the Miocene period, and rests upon the most important fossil 

 shell bed of the Tertiary region. Prof. Tyson states that Dr. C. Johnson has 

 made out more than one hundred forms of Diatoms in No. 3. 



Dr. Fisher exhibited a stereoscopic picture of a parasitical insect, 

 taken by means of a new and ingenious arrangement of the ordinary 

 microscope, by Dr. R, E. Griffith. The insect was magnified between 

 20 and 25 diameters. 



December ISth. 

 Vice-President Bridges in the Chair. 



Forty members present. 



The following papers were presented for publication in the Proceed- 

 ings : 



" Description of some new Species of Tertiary Fossils from ChiriquL 

 Central America, by Wm. M. Gabb." 



" Descriptions of three new Species of Star-fishes from Cape San 

 Lucas, Lower California, by John Xantus." 



" Descriptions of new North American Coleoptera, in the Cabinet 

 of the Entomological Society of Philadelphia, by George H. Horn." 



" Catalogue of Colubridse in the Museum of the Academy of Natural 

 Sciences of Philadelphia, &c, Part 3, by E. D. Cope." 



And were referred to Committees. 



December 25th. 



Vice-President Bridges in the Chair. 



Twenty-nine members present. 



On report of the respective Committees, the following papers were 

 ordered to be published in the Proceedings : 



The Humming Birds of Mexico. 



BY RAFAEL MONTES DE OCA, 



Of Jalapa, Mexico. 



No. 3. 



Campyloptekus pampa, Gould. 



Obnismyia pampa, Lesson. 



Pampa campylopteba, Reichenbach. 



The people of Coatepec, nine miles from Jalapa, give to this species of Hum- 

 ming Bird the name of Chupa-mirto fandanguero or Fandango Myrtle-sucker, 



I860.] 



