ITO MNIOTILTID^. 



even Bendrceca. We are now acquainted with twenty-seven species, which are widely 

 distributed throughout Tropical South America, from South Brazil to Mexico. The 

 countries including the Andes possess the greater proportion of the species ; but Central 

 America is well represented by eight species, only two of which {B. hivittatus and 

 B. mesochrysus) have been found outside our limits. Mexico has three species — 

 B. culicivorus, B. belli, and B. ruftfrons; Guatemala the same number, B. delattrii 

 taking the place of B. rufifrons. Costa Eica and Panama have five species — the two 

 southern ones B. hivittatus and B. mesochrysus, B. melanogenys and B. leucopygius both 

 peculiar, and B. culicivorus in common with Mexico and Guatemala. 



These eight species seem divisible into three groups, all of which are represented in 

 South America, where others are also found. Prof. Baird has divided the genus into 

 three subgenera, which he calls Basileuterus, Idiotes, and Myiothlypis ; but the lines of 

 demarcation between them are so indefinite that we prefer to retain the use of the 

 name Basileuterus in its wide sense, and to group the species in sections. 



a. Pileus mediusfiavus aut aurantiacus, utrinque nigra marginatus ; genoe 



nee nigrce nee castanece. 



1. Basileuterus hivittatus. 



Muscicapa bivittata, d^Orb. & Lafr. Syn. Av. i. p. 51 \ 



Muscicapara bivittata, d'Orb. Voy. Am. Mer. Ois. p. 334^. 



Basileuterus bivittatus, Scl. P. Z. S. 1859, p. 137 ' ; 1860, p. 85 *; Salv. Ibis, 1870, p. 108 ' ; P. Z. S. 



1870, p. 183"; Scl. & Salv. P. Z. S. 1879, p. 594'. 

 Myiodioctes tristriatus, Tsch. Faun. Per. p. 193, 1. 13. f. 1 \ 

 Basileuterus melanotis, Lawr. Ann. Lye. N. Y. ix. p. 95 ° ; Salv. Ibis, 1869, p. 313 " ; v. Frantzius, 



J. f. Orn. 1869, p. 394 '\ 



Supra olivaeea, pileo medio aurantiaoo-cinereo utrinque late nigro marginato, superciliis sordide albis, loris 

 poBticis at regions parotica nigris ; subtus sordide flavioante, hypoohondriis nigris olivaceo indutis ; rostri 

 maxilla corylina, mandibula albicante ; pedibus pallida corylinis. Long, tota 5-0, else 2-5, caudse 2-3, 

 rostri a riotu 0-6, tarsi OS. (Descr. exempl. ex Costa Eica.- Mus. nostr.) 



Eab. Costa Eica {Van Patten), Cervantes (/. Carmiol ^), Birris {v. Frantzius ^) ; Panama, 

 Cordillera del Chucu [Arce ^ ^). — Colombia^ ; Ecuador ^ ^ ; Pbeu ^ ; Bolivia ^ ^ t_ 



This southern species is by no means common in Central America, where it has been 

 found in Costa Eica and in the State of Panama. The first Costa-Eica specimens which 

 came into Mr. Lawrence's hands were described by him as a new species under the name 

 B. melanotis ^ ; but on receipt of specimens from the State of Panama we were enabled 

 to compare them with South- American examples attributed to B. hivittatus, and found 

 them not separable^. Since then we have obtained a Costa-Eica example and a much 

 more extensive series from South America, including two from Simacu in Bolivia ^, the 

 country of the true B. hivittatus. In this series there is a certain amount of variation 

 in the colouring of the central portion of the vertex, and in the amount of black 



