Nov. 1907. BIRDS FROM GUATEMALA DEARBORN. 135 



Stibspecific characters: Similar to R. s. olivaceous but having the 

 olive-green of the upper parts distinctly brighter green, and the gray 

 nuchal collar not more than half as wide. 



Description of type: 'Tnterscapulum, rump and edgings of win"g 

 and tail feathers bright olive-green; median area of pileum cadmium- 

 orange, bounded anteriorly and laterally by a line of lemon-yellow; 

 which in turn, is bounded anteriorly and laterally by a line of black; 

 and this, again, is bounded anteriorly and laterally by a line of white, 

 which covers the frontal and superciliary areas. Ocular and malar 

 areas dusky, separated by a narrow white line. Sides of head and 

 cervix olive-gray. Underparts smoke-gray, abdomen and under tail 

 coverts slightly paler than the breast and throat. Wing 54 mm. ; 

 tail 40 mm.; exposed culmen 8 mm.; taisus 18 mm. Greater wing 

 coverts tipped with pale buff. 



Adult female: Colored like male except central line of pileum 

 which is entirely lemon-yellow. Wing 52 mm. ; tail 37 mm. ; exposed 

 culmen 8 mm.; tarsus 17 mm. 



Remarks: This form is as much brighter colored than R. s. oliva- 

 ceous as that form is brighter than R. s. satrapa; and the gray collar, 

 which on s. satrapa invades the interscapulum, and grades so gradually 

 into the olive-green of the rump that the back shows as much gray 

 as it does olive-green ; and which in 5. olivaceous reaches well on to the 

 interscapulum where it ends more abruptly; in clarus does not reach 

 the interscapulum at all, the bright olive-green extending clear up 

 over the shoulders. Through the kindness of Dr. Allen of the Ameri- 

 can Museum of Natural History I have been able to compare these 

 Guatemalan specimens with the specimen named aztecus Ridgway, 

 from Mexico City, in the Lawrence collection, which is apparently 

 only an unusually dark example of olivaceous, and less like these than 

 is the usual type of olivaceous. Three specimens were collected; a 

 male, January ad, and a male, and female April i3th. They were 

 among second growth cypress at altitude 9,500 feet, and considering 

 the dates, were probably residents. At all events the character of 

 the timber land is precisely such as this species ordinarily selects to 

 breed in. 



295. Polioptila cserulea mexicana Ridgway. 



This gnat-catcher is apparently restricted to the low country. 

 Two specimens, both females, were taken, one at Los Amates 

 January 3ist, and the other at San Jose March 7th. This last bird 



