Seen at all seasons of the year at Queretaro. 
Nest placed in a thick dense growth of bushes; 
the prickly pear and other of like nature pre- 
ferred. The nest is compact and strongly made, 
lined with the grass stems of various grains. 
Eggs differ from foregoing, in having ground 
color of a greenish hue, and the spots more dis- 
tinct and each with a certain individuality. 
Polioptila cwrulea, (Blue-gray Gnatcher). Occa- 
sionally seen during the winter months around 
Tampico and Pachuca. 
Parus atrocristatus, (Black-crested Titmouse). 
Fairly common in the northern part of the Re- 
public; especially along the valley of the Rio 
Grande and around Lampazos, where it breeds. 
The material used in the nest reminds me of that 
of the Great-crested Flycatcher. 
Auriparus flaviceps, (Yellow-headed Tit. Ver- 
din). Tolerably common along the Rio Grande, 
and seen further south in winter. Breeds com-* 
monly, building a large nest with an imposing ex- 
terior of thorns placed in an almost impenetrable 
bush. 
Sitta carolinensis aculeata, (Slender-billed Nut. 
hatch). Noticed several times in the timber on 
the river banks. 
Campylorhynchus brunneicapillus,Cactus Wren). 
A common resident of the northern portion of 
Mexico. Conspicuous in its nesting among the 
cacti, it is one of our prominent breeders. Eggs 
are found at various dates throughout the sum- 
mer and proves that more than one brood are 
raised. 
Sulpinctus obsoletus, (Rock Wren). Have seen 
this species in the vicinity of Guaymos and in the 
adjacent interior country. No observation of its 
breeding recorded, though it probably does. 
IIave often seen small bands of a dozen or more 
scurrying along the rocky banks of some canon 
stream. 
Cistothorus palustrus, (Long-billed Marsh Wren). 
One specimen taken from a small flock at Tampi- 
co is the only record I have of its occurrence at 
that locality. 
Anthus pensilvanicus, (American  Titlark). 
Quite common in winter along the coast and in 
some interior marshes. 
Mniotilta varia, (Black and White Warbler). 
Most commonly observed as a migrant at Tam- 
pico. Several were seen inland from Campeche 
in winter. 
Protonotaria citrea, (Prothonotary Warbler). 
Several were noticed when at Campeche during 
the winter. 
Helmitherus vermivorus, (W orm-eating Warbler). 
Several of this species were noticed during the 
latter part of winter at Pachuca. 

Warbler). A few were seen in the winter season 
of 1885 and 1886, at Campeche and Merida. Ob- 
served that they kept mostly in small flocks; 
generally in pairs. 
Helminthophila ruficapilla, (Nashville Warbler). 
Common in winter at Campeche, and even a few 
were seen as far north as Pachuca. They move 
in flocks. 
Compsothlypis americana, (Blue Yellow-backed 
Warbler). An abundant bird at certain times. 
Have seen a few at Tampico quite late in winter, 
but the larger numbers are to be found at Merida 
and south of the city. 
Dendroica estiva, (Yellow Warbler). Noticed 
commonly in the country between Campeche 
and Gautemala. <A very restless bird. 
Dendroveu blackburnie, (Blackburnian Warbler). 
Not commonly observed. Seen a few times flit- 
ting through the groves near Tampico. Also ob- 
served in winter at Merida. 
Geothlypis trichas, (Maryland Ycllow-throat). 
Common in winter about Campeche and farther 
south. Do not notice it at Tampico in spring, 
although it is frequently observed in autumn. 
Ieteria virens longicauda, (Long-tailed Chat). 
This is another species which is observed more 
plentifully about Guamas and along the Pacific 
coast. 
Syloania mitrata, (Hooded Warbler). This 
species comes under my notice in a rather erratic 
manner, some seasons not observing any, while 
some winters they are common. Usually to be 
found around Campeche and thence to Gautemala. 
Syloania pusilla, (Wilson’s Warbler). Fairly 
common at Tampico, when moving south in au- 
tumn and early winter. A few remain about 
Merida all winter. 
(To be continued.) 

The Relative Size of Eggs of the Red- 
tailed Hawk to the Parent Bird. 
In no work on Odlogy with which the present 
writer is acquainted has the very interesting 
question of the relative size of the parent birds to 
their respective sets of eggs been considered. In 
the present article it is proposed to give the 
measurements of a series of eggs of the Red-tailed 
Hawk, (Buteo borealis), together with the size of 
the female parent of each set. In each case the 
female was shot as she flew away from the nest, 
and the skin preserved with the eggs. The 
parent birds and the eggs are in the cabinet of 
F. H. Carpenter, who has very kindly furnished 
all the measurements, notes, etc. All the meas- 
urements are in inches, and any credit which is 
