128 THE NATURALIST’S GUIDE. 
TROCHILID®, — Taz Hummine-Birps. 
122. Trochilus colubris, Linx. — Ruby-throated 
Humming-Bird. Common summer resident. Breeds, nest- 
ing in trees. Arrives about the second week in May ; 
have seen it as late as the 23d of September. 
123. Argytira maculata, Cis. and Heins.— Lin- 
neus’s Emerald. A single specimen of this beautiful little 
bird was captured by Mr. William Brewster, at Cambridge, 
in August, 1864; it was monlting, and apparently a fe- 
male. How this little stranger should have come so far 
from its usual habitat, which is northern South America, 
is a mystery, and an event unheard of before. It certainly 
could not have been ciged, and in that manner brought 
here, as it would not survive the passage. 
I have carefully examined into the history of this speci- 
men, and there seems no reason to doubt its being captured 
in Cambridge. 
CUCULIDA, — Tue Cvuckoos. 
124. Coccygus Americanus, Boy. — Yellow-billed 
Cuckoo, Irregular in its visits ; during the summer of 1866 
it was very numerous, while the following species was 
rare; since then this has been rare, while the other is 
common. Arrives from May 18th to 23d. Frequents the 
woods and orchards. : 
125. Coccygus erythrophthalmus, Bon. — Black- 
billed Cuckoo. Rather common. (See remarks under C. 
Americanus.) Frequents the woods and orchards. The 
note of this species is not perhaps as harsh as the other. 
They are both inveterate destroyers of birds’ eggs. They 
frequently sing at night. Both depart early in September. 
