FAMILY TYRANNIDAE 525 



was no visor or roof over the entrance like that found regularly 

 in the nests of the more common species. The two eggs measured 

 16.5 X 12.7, and 17.5 x 12.7 mm. 



Skutch (Pac. Coast Avif. No. 34, 1960. pp. 490-495), in an ac- 

 count of this subspecies in southwestern Costa Rica, found that the 

 nest built by male and female working together was closely similar 

 to that of the common tody-flycatcher. While the structure was 

 suspended so that it hung free at the tip of a branch, from a meter 

 to 3 meters from the ground, the location was in cover of under- 

 growth. Nest building proceeded slowly. In seven nests examined 

 he found two eggs, or two nestHngs. The eggs were "white, with a 

 wreath of chocolate spots and a sprinkling of the same over the re- 

 mainder of the surface." The extremes measured 19.1 X 13.1, 17.1 X 

 13.5, and 17.1x12.7 mm. Incubation was by the females alone. 

 At one nest the male did not approach the structure closely. At two 

 others the males occasionally clung at the doorway to look inside, but 

 did not enter. The incubation period was 18 or 19 days. The young 

 at hatching had pink skin with small tufts of gray down on head and 

 back. 



The food is small insects, as in the related species. 



ONCOSTOMA CINEREIGULARE (Sclater) : Northern 

 Bentbill, Piquitorcido Norteno 



Todirostrum cinereigulare P. L. Sclater, Proc. Zool. Soc. London, vol. 24, 1856 

 (January 26, 1857), p. 295. (Cordoba, Veracruz, Mexico.) 



Small ; bill heavy, distinctly curved ; breast gray. 



Description. — Length 90-100 mm. Adult (sexes alike), crown dull 

 slate-gray, the feathers with darker streaklike centers ; hindneck, 

 back, scapulars, rump, and upper tail coverts olive-green ; wings 

 dusky ; lesser, middle, and greater wing coverts edged with olive- 

 green; primaries and secondaries edged also, but usually with some- 

 what yellowish olive-green ; tail dusky, edged with olive ; lores more 

 or less grayish white ; side of head grayish ; throat and foreneck 

 grayish white, streaked with gray; chest and sides dull gray, lined 

 with grayish white ; rest of under surface light yellow, with the sides 

 and flanks streaked and washed with olive ; axillars and under wing 

 coverts pale yellowish white ; inner webs of wing feathers with dull 

 whitish edgings. 



In museum specimens the tarsus and toes are light yellowish brown. 



Measurements. — Males (10 from Chiriqui, Bocas del Toro, Costa 

 Rica, Guatemala, Honduras, and Chiapas), wing 50.0-52.9 (51.3), 



