94 FIELD MUSEUM OF NATURAL HISTORY ORNITHOLOGY, VOL. I. 



material examined. One of the El Rancho skins is indistinguishable 

 in color from the topotypes, and the skins of santa-cruzi from Atitlan, 

 Amatitlan and Patulul are but very little larger than the type of 

 pauper as given in the original description. There is no doubt, 

 however, that in a series of pauper the white bars of the back average 

 narrower than in a series from the interior of Guatemala, and decidedly 

 narrower than in another series from Tamaulipas, where santa-cruzi 

 passes over into aurifrons. It is indeed singular that this latter 

 form with its heavily barred primaries, so strikingly different 

 from the typical Guatemalan ferm, has not been honored with a 

 name. 



97. Centurus santa=cruzi fumosus Nelson. 



A specimen taken at San Jose has the dark breast, spotted rump 

 and wide bill characteristic of this form which was described by 

 Nelson from Chiapas. In each of these respects it differs from all 

 the other specimens of Centurus that were taken. 



98. Colaptes mexicanoides Lafresnay. 



This flicker was first seen at Lake Atitlan, and from that altitude 

 (5,000 feet) up to the limit of timber it appears to be tolerably com- 

 mon. Several were seen at 9,500 feet. A nest, containing four 

 addled eggs and one naked young bird less than a week old, was 

 found at Lake Atitlan, April loth. The male parent was driven 

 from the nest. The female was not seen, though half an hour was 

 spent about the nest, which was in a willow standing in a growth 

 of coffee. The cavity was in decayed wood, and in all respects was 

 similar to that excavated by our northern species. The nestling, 

 which was preserved in formaldehyde, was badly infested with 

 parasitic larvas, apparently dipterous. Of the four adult males 

 that were taken, one at Lake Atitlan and three near Tecpam, only 

 one has the white rump immaculate. 



Family Caprimulgiclfe. 



99. Antrostomus chiapensis Nelson. 



At Lake Atitlan, this bird was singing in April and was reported to 

 have begun at least as early as February. Its notes are indistinguish- 

 able from those of A.vociferus. It was not heard below 5,000 feet. 

 One male was taken at Lake Atitlan and another at Tecpam. 



