50 TTEANNID^. 



The range of this species coincides, to a great extent, with that of M. luteiventris. 

 For though it has not yet been noticed in Southern Arizona, it occurs with the alUed 

 species in the Sierra Madre of Tamaulipas, and thence southwards along the eastern 

 slope of the mountains of Vera Cruz into Yucatan, Costa Rica, Panama, and a large 

 portion of Northern South America. It has not yet been traced in Western Mexico or 

 Guatemala, but is doubtless found in the latter country. 



M. nohilis is said to differ from M. audax in being " brighter, and the breast-spots 

 narrower," but with the series before us we cannot fix any such difference to any 

 particular district. Nor is it otherwise with M. a. imolens, the bill of which is said to 

 be shorter, and the upper plumage devoid of rusty tinge. 



Mr. Sclater speaks of his M. nobilis as an intermediate form passing into M. lutei- 

 ventris and M. audax at the northern and southern extremities of its range. We only 

 find this to be the case as regards M. audax, for we can always distinguish M. luteiventris 

 by the characters upon which Mr. Kidgway lays stress. 



The fact of two closely allied species being found together is no doubt difficult of 

 explanation, and we have no solution to offer. So far as our specimens go it appears 

 that the sexes are alike in both species. 



Salmon, who found the nest and eggs of M. audax in the Cauca valley of Colombia ^, 

 describes the former as made of fern-stalks and twigs, and placed in the fork of a tree 

 or high bush ; the eggs are white spotted with red. 



b. Corpus subtus immaculatum. 



3. Myiodynastes hemichrysus. (Tab. xxxviil. fig. L) 



Hypermitres chrysocephalus. Cab. J. f. Orn. 1861, p. 246 ^. 



Hypermitres hemichrysus, Cab. J. f. Orn. 1861, p. 247'; Salv. P. Z. S. 1870, p. 193'. 

 Myiodynastes hemichrysus, Lawr. Ann. Lye. N. Y. ix. p. 114 ^ ; Scl. Cat. Birds Brit. Mus. xiv. p. 188 °. 

 Myiodynastes super ciliaris, Lawr. Ann. Lye. N. Y. viii. p. 470 ^ 



Supra olivaceus, uropygio fuscescentiore ; capite summo nigricanti-olivaceo, crista magna celata flava omato ; 

 superciliis elongatis et stria utrinque malari latescenti-albis ; fascia lata a naribus per oculos nigra ; alis 

 et Cauda fuscis ; secundariis intimis albido extrorsum limbatis ; tectricibus et primariis internis rufo 

 limbatis ; rectricibus utrinque rufo marginatis : subtus flavns ; gula albicantiore ; hypochondriis olivaceis : 

 rostro et pedibus nigris. Long, tota 8-0, alae 4-0, caudae 3'35, tarsi 0-75, rostri a rictu 1-15. (Descr. 

 maris ex Calovevora, Panama. Mus. nostr.) 



Av. juv. cristam oelatam caret. 



Eab. Costa EiCA (v. Frantzius ^ ^), Barranca {Carmiol^); Panama, Chitra, Calovevora, 

 Calobre {ArcS ^). 



This species is a near ally of the Andean M. chrysocephalus, from which it may be 

 distinguished by the clearer yellow of its throat and under surface. Its range is very 

 restricted, as it is not found beyond the mountains of Costa Rica and the adjoining part 

 of the State of Panama. No member of this section of the genus is found on the line of 



