154 Nelson New Birds from Southern Mexico. 



Cyanolyca mirabilis, sp. nov, 

 Ornilteme Jay. 



Type.T&o. 186,545, $ ad., U. 8, Nat. Mus., Biological Survey Col?, 

 From Ornilteme, Guerrero, Mexico. Collected May 22, 1903, by E. W, 

 Nelson and E. A. Goldman. 



Distribution. Known only from type locality in the oak forests on the 

 Sierra Madre of Central Guerrero (above 7,000 feet). 



Specific characters. A narrow band of silvery white extends across 

 forehead and back over eyes and behind ear coverts, to unite with large 

 white area covering chin, throat r and under side of neck; rest of head, 

 neck and upper breast black; rest of upper parts and under side of body 

 blue. 



Description. A band of silvery white, 2 to 3 mm. broad, extends across 

 forehead between fore part of orbits and thence back over eyes, along 

 sides of crown and down behind ear coverts, to unite with a large silvery- 

 white area covering throat and under side of neck; rest of head, neck 

 and fore breast uniform black; back, including upper surface of wings 

 and tail and under side of body, dull indigo blue; under side of wings 

 dark hair brown; under siie of tail brownish black. 



Dimensions of type. Wing, 110; tail, 118; culmen, 23; tarsus, 34. 



Remarks. The discovery of this remarkable species, the handsomest 

 and most strikingly marked one of the genus, was one of the unexpected 

 results of our visit to the rich bird district about Omilteme. So many 

 rare and interesting species were taken during our brief stay that it is 

 evident this locality would repay more careful work. The Omilteme 

 jay, of which our collection contains 8 specimens, is so different from 

 any of its known congeners that no comparison between them is needed- 

 Its size is very similar to that of C. pumilo. 



Aphelocoma gtierrerensis, sp. nov. 

 Guerrero Jay. 



Type. No. 185,539, $ ad., U. S. National Museum, Biological Survey 

 Collection, from Omilteme, Guerrero, Mexico. Collected May 19, 1903, 

 by E. W. Nelson and E. A. Goldman. 



Distribution. Humid oak forest on west slope of the Sierra Madre of 

 central Guerrero, Mexico (above 7,000 feet). 



Specific characters. Head and body uniform rich dark blue (between 

 hyacinth and Berlin blue of Ridgway). Size larger than Aphelocoma 

 unicolor. 



Description. Entire head, body, with upper surface of wings and tail 

 rich dark blue (of a shade between hyacinth and Berlin blue of Ridg 

 way); inner web and under surface of quills brownish black, a little 

 darker than in A. unicolor; under side of tail coal black (much darker 

 than in A. unicolor'), with faint wash of blue in certain lights. 



