•"^^h'''] PROCEEDINGS OF THE NATIONAL MUSEUM 525 



of these liave the liead as dark a chestnut as the birds from the Pacitic 

 side (five adult males, iucludin<? the type of ca.sfaneiveps.) The type of 

 C(ist<(nei<'eps differs from hryanfi, as shown by Mi', liidgway, only in the 

 darker chestnut head; like the type of the latter, the ju<,'nlum and 

 breast are marked with a few very indistinct and mostly concealed 

 streaks of chestnut-rufous. These streaks in two birds from Mazat- 

 lan, Mexico, are very niu(;h better defined and broader; in No. 5.'>1252, 

 U. S. National Museum, the chestnut throat is sharply defined, the 

 color not extendin*;;' onto the foreneck ; in So. 35017 the chestnut of 

 the throat is not so well defined, and extends more onto the foreneck. 

 In the two Costa Kican examples (Nos. 55 and 2943, Museo Nacioiial de 

 Costa Kica), the chestnut extends more onto the foreneck and has an 

 ill-defined margin, while the streaks on the jugulum and breast are a 

 trifle wider and brighter than in the Mazatlan examples; notso broad, 

 however, as in birds from the Atlantic side. We may sui)pose from 

 analogy, I think, that birds from Yeragua would come another step 

 nearer vieiUofi. 



With the material 1 have before me 1 believe the bird found on the 

 Atlantic side from Mexico to Costa Kica should bear the name Demlroica 

 vieiUoti hryanti (Ridgway), as it was first separated by Mr. Ridgway; 

 while the birds found on the Pacific side, from Lower California to Costa 

 Rica, would become Dendroica vieiUoti castaneiceps (Ridgway). 



CantancicepH is distinguished from hryanti by the darker ricli chest- 

 nut head, and the stripes on the jugulum and breast usually narrower 

 (in the ty])e almost wanting) and less well defined. 



/>. r/e;7/o/t is distinguished from either of the preci^'ding by the broad 

 cliestnut stripes on the under parts merging into the chestnut of the 

 throat, which has no definate margin. 



Two young males of />. rieillofi /;;7/(7»// just assuming the adult phase 

 are prohably deserving of some notice. Their general coloring above 

 is dusky olive-yellow, interspersed with manj' ashy-gray feathers, crown 

 ashy, witli an olive-yellow shading and many chestnut-rufous feathers, 

 especially on the forehead; the edges of the win^g are not so bright 

 yellow as in the adult bird ; the prevailnig color below is cream-color, 

 with here and there a few gamboge-yellow feathers withchestnutstreaks, 

 especially on the breast and jugulum. The throat in one is rnfous- 

 chestnut, as in the adult; while in the other it is ashy-whitish, with 

 chestnut shading. The adult female has the head dusky olive-yel- 

 lowish (like the back), strongly shaded with a yellowish rufous; below, 

 the chin, throat, and sides of face are ochre-yellow, with a rufous shad- 

 ing; the remaining lower parts are as in the male, only the (chestnut 

 streaking is pah'r. A young female is olivaceous-ashy above ; brighter 

 olive on the rum]), and deeper ash on the head, (leneral color below 

 cream-color, grayish along the sides, and the under tail-coverts ])ale 

 yellowish. 



