Nov. 1907. BIRDS FROM GUATEMALA DEARBORN. 95 



100. Nyctidromus albicollis (Gmelin). 



Parauques were common up to an elevation of about 4,000 feet, 

 above which none were seen. Three were taken at Los Amates, one 

 at Gualan, two at Lake Amatitlan, one at Patulul and one at San Jose. 

 It seems as if the upper vertical limit of this species might be approxi- 

 mately coincident with the lower limit of Antrostomus. In size these 

 Guatemalan specimens are nearer those from Nicaragua and Costa 

 Rica than the) r are to Yucatan specimens. One of the Los Amates 

 birds, a male, has the ground color of the crown, nape and interscapu- 

 lar region, a warm brown, similar to walnut-brown of Ridgway's 

 Nomenclature of Colors. A Yucatan specimen taken at San Felipe, 

 is like it except in being a shade paler. Another from Colima in west- 

 ern Mexico, in a much drier climate is yet paler brown, and strikingly 

 different from the normal gray characteristic of average specimens. 

 The occurrence of three pale individuals out of a series of fifteen from 

 Guatemala and southern Mexico indicates dichromatism. In a series 

 of eleven skins from Nicaragua and Costa Rica there is practically no 

 color variation, all being of the gray type. 



These birds were often seen in paths, roads, or along the railway, 

 in the evening. In the day time they were usually found on the 

 ground among bushes at the edge of clearings. One of the Los Amates 

 specimens was found, during a cold rainy spell, in a torpid condition, 

 and was picked up alive. At San Jose three were flushed from the 

 same spot, where they were evidently spending the day in company. 



101. Chordeiles acutipennis texensis (Lawrence}. 



The only example of this species met with was at Lake Atitlan, 

 where it was discovered in a tree standing in a field. It proved to be a 

 male in fine plumage. 



Family Micropodldse. 



102. Streptoprocne zonaris (Shaw). 



This great swift was seen once or twice at Los Amates in January, 

 flying very high over the Motagua River. None were noted again 

 until April, when, in the mountains between Lake Atitlan and Tecpam, 

 at about 6,500 feet, a small colony was discovered. The nesting place 

 was a cliff of friable rock, pierced with cavities running in various 

 directions. A vertical tunnel, or flue, elliptical in cross section and 

 having a major diameter of perhaps twelve feet, was evidently the 



