176 MNIOTILTIDZ. 
reexamining the question, we believe that B. rufifrons is strictly confined in its range to 
Mexico, and B. delattrii to Guatemala, B. mesochrysus appearing again in the more 
southern parts of Central America. 
7. Basileuterus delattrii. 
Basileuterus delattrii, Bp. Compt. Rend. xxxviii. p. 883, et Notes Orn. p. 631; Scl. & Salv. Ibis, 
1860, p. 2747; Baird, Rev. Am. B. i. p. 249°. 
Basileuterus rufifrons, Salv. Ibis, 1866, p. 192°. 
B. rufifronti valde similis, sed abdomine toto flavo distinguendus. (Descr. maris ex Volcan de Agua, Guate- 
mala. Mus. nostr.) 
Hab. Guatemaua, Duefias?4, Volcan de Fuego, Volcan de Agua, Coban ?, Lanquin, 
Cahabon (0. 8S. & F. D. G.); Nicaracua (Delattre 1)?. 
It is very doubtful if this species is found beyond the limits of Guatemala and, 
perhaps, Nicaragua ; and we believe that all Mexican specimens attributed to B. delatiri 
will prove to be somewhat immature examples of B. rujifrons, just as Guatemalan 
birds called by the latter name are almost certainly of the present species. What we 
take to be immature birds of both these species have the belly a yellowish white, which 
in B. rufifrons becomes greyish white in the adult and in B. delattrii yellow, like the 
throat. Regarding the occurrence of this species in Nicaragua some doubt must be 
entertained, as it is very probable that Delattre’s specimens described by Bonaparte as 
from that country were really obtained in Guatemala. In Costa Rica the place of 
B. delattrii is taken by the more southern form B. mesochrysus. 
In Guatemala we found this species in the forests of both volcanos, at elevations 
ranging between 2500 and 5000 or 6000 feet, and in Vera Paz at several places in the 
valley of the Cahabon river, between Coban and Cahabon. Its habits are similar to 
those of B. belli add B. culicivorus. Of its nidification nothing has yet been recorded. 
8. Basileuterus mesochrysus. 
Basileuterus mesochrysus, Scl. P. Z. S. 1860, p. 251'; Baird, Rev. Am. B. i. p. 250°; Salv. P. Z.S. 
1867, p. 186°; 1870, p. 188*; Lawr. Ann. Lyc. N. Y. ix. p. 95°; v. Frantzius, J. f. Orn. 
1869, p. 294°; Salv. & Godm. Ibis, 1879, p. 117”. 
Basileuterus delattrii, Cab. J. f. Orn. 1860, p. 325°; Lawr. Ann. Lyc. N.Y. vii. p. 322° (nec 
Bonaparte). 
Basileuterus brunneiceps, Bp. Consp. i. p. 814” (nec d’Orbigny et Lafresnaye). 
B. delattrii valde affinis, sed nucha cinerea, stria rictali alba magis extensa forsan distinguendus. (Descr. 
exempl. ex Paraiso, Panama. Mus. nostr. 
Hab. Costa Rica, San José (v. Frantzius®), Guaitil and Grecia (Carmiol®), Irazu 
(Rogers); Panama, Volcan de Chiriqui, Chitra‘, Calobre+ and Santa Fé? (Arcé), 
line of railway (1/‘Leannan °®), Paraiso station (Hughes).—CoLomBIA, Sierra Nevada 
de Santa Marta’, Bogota! , 
