MYIARCHUS. 95 
Tigre I. (G. C. Taylor’); Nicaragua, Blewfields (Wickham?"), Greytown (Holland), 
Sucuyaé °°, Omotepe I.3! (Nutting) ; Costa Rica®, Angostura '', Sarchi 1, Grecia ?8, 
Barranca *®, San José*8, Pacuar™ (Carmiol), Ivazu (Rogers), Tucuriqui (Arcé) ; 
Panama, Volcan de Chiriqui, Chitra 2° and Santa Fé 5 (Arcé). 
We have before us about 130 specimens of this species from various points ranging 
from Southern Arizona and Northern Mexico down to the State of Panama, and, 
though we can see obvious differences in selected birds from several places, other speci- 
mens undoubtedly blend the whole series together. Thus the Arizona birds separated 
by Mr. Ridgway as I. /. olivascens are, for the most part, as he describes them—pale, 
with the top of the head hair-brown or olive, very little darker than the back, the tail- 
feathers in the adult bird without rufous edgings on the inner web. 
Birds from Sonora exactly resemble those from Arizona, while those from Mazatlan 
are a trifle darker, and have the top of the head more distinctly coloured. Specimens 
from Northern Yucatan included in the same race by Mr. Ridgway are, again, a trifle 
darker as regards the head, and we can match them with some specimens from Teapa 
selected from numbers of the more typical form, and from them, too, Cozumel birds 
cannot satisfactorily be discriminated. Returning to Mexico we find that birds from 
the north-eastern States of Nuevo Leon and Tamaulipas and the slopes of the mountains 
of Northern Vera Cruz are distinguished by their larger size and by the broad rufous 
edging to the tail-feathers. This latter character seems gradually to disappear in birds 
from further south ; in those from Orizaba it is but slightly shown, and in Tabasco 
examples it has altogether disappeared. ‘The Guatemala bird precisely resembles that 
of Tabasco, nor do we see how that of Costa Rica and the western portion of the State 
of Panama can be satisfactorily discriminated. Under these circumstances we think it 
best to unite all these forms under one specific name. The plan adopted by American 
ornithologists would be much as follows :—We should have M. lawrencii from North- 
eastern Mexico and a portion of the State of Vera Cruz, M. J. olivascens from Arizona 
southwards through Western Mexico and Yucatan including Cozumel, and, lastly, 
M. 1. nigricapillus from Vera Cruz southward through Tabasco to Guatemala, Costa 
Rica, and the State of Panama; but such an arrangement would not enable us to 
name with certainty many intermediate birds; we therefore prefer to include them all 
under one comprehensive name. 
Myiarchus lawrencit is a common bird wherever it is found, its chief abode being the 
low lands bordering both oceans up to an elevation of 4000 or 5000 feet. On the Tres 
Marias Islands Grayson says it is abundant in all parts of the woods. In Guatemala it 
is common, and though more often seen in the forests of the hotter parts of the country 
may not unfrequently be met with in the temperate districts, such as Coban, Tactic, 
and Duefias. 
The eggs of this species taken by M. Boucard at Talea® are described as pure white, 
