1848.] 91 



36. Euphonia occipitalis, Du Bus. Esqu. Orn. part iii, pi. 14. 



It is the female of this beautiful species, which is described and figured by 

 M. Du Bus. The male is as follows : 



Above, glossy parrot-like green, which is also the colour of the throat to the 

 breast, where it is terminated by a narrow crecsent of glossy chesiiiit brown. 

 Breast, middle of the abdomen and under tail coverts, yellow. Flanks green. 

 Occipital spot and semicollar on the front of the neck, pale blue. 



According to Mr. Pease, this species is found among low thickets, in ravines, 

 at the foot of the mountains, from October to February ; not comm.on. Mexican 

 name, ysabeliia. 



37. Tiaris olivaceus, (Linn.) Lath. Gen. Hist. V. p. 340. 

 Ernberiza olicacea, Liim. Tiaris pusillus, Swainson. 

 Near Jalapa ; iris nearly black. 



38. Tiaris nitens, (Linn.) 



Near Quarterpec ; not common ; iris nearly black. 



39. Carduelis vmgellanicus, (Viell) Aud. Birds of America, 394. 



40. Pteroghsatis prasiniis, hicht. GouldMon.pl. 18. 



Neighbourhood of Jalapa, during April, May, and June ; iris chocolate coloor. 



41. Crotophaga sulcirostra, Swainson. Gervais, Atlas de Zool, pi. 17. 



]\Iale and female very similar in plumage ; from the Puente Nacional, where, 

 according to Mr. Pease, this species is numerous, flying in flocks ; iris white. 



42. Fiaya cayana, (Linn.) 



Mr. Pease's specimens are precisely similar to specimens from South America. 



43. Picus varius, Linn. 



Common on the lower part of the tierra calienie all the year. 



44. Melanerpes formicivorus, Swainson. PI. col. 451. 



Upper part of the tierra calitnte, and as far as the foot of the mountains j feeds 

 on high trees ; iris white ; sexes similar. 



45. Centurus subelegans, (Bonaparte.) 



On the tierra caliente, and the hills above, all the year ; sexes similar. 



fTo be continued.} 



The Committee on the following paper by Mr. Pease reported in 

 favor of publication. 



Observations on the Geology and Natural History of Mexico. 



By Wm. H. Pc.tsE. 



Haviti" noticed among the published correspondence from the army in Mexico, 

 but little information respecting the n:»tnral features of that country, I take the 

 liberty of presenting to the Academy the result of a few hasty observations 

 made on a part of the route from Vera Cruz to the city of Mexico. But few op- 

 portunities for scientific investigations were afforded to those connected with the 

 army, on account of the active operations they were incessantly engaged in, from 

 the time of leaving the coast until the return of the army. I was enabled, how- 



14 



