288 REVIEW OF AMERICAN BIRDS. [PART I. 
head are blackish; the throat grayish-white ; the breast pale chest- 
nut, both with dusky shaft streaks. The chestnut of front and ramp 
is quite pale. 
. Petrochelidon Lunifrons. 
Hirundo lunifrons, Say, Long’s Exp. II, 1823, 47 (Rocky Mts.).—Cassin ; 
Brewer, N. A. Ool. I, 1857, 94, pl. v, no. 68-73 (eggs).—Barrp, 
Birds N. Am. 1858, 309.—Lawrence, Ann. N. Y. Lye. 1861, 317 
(Panama R. R.; winter).—Vernit, Pr. Bost. N. H. Soc. 1864, 276 
(migration and history).—Lorp, Pr. R. A. Inst. Woolwich, IV, 
1864, 16 (Br. Col. ; nesting).—Cooprr & Suckuey, P. R. R. XII, 11, 
184 (Wash. Terr.). 
Hi. opifex, Cunton, 1824.—H. respublicana, Aup. 1824. 
H. fulva, Bon. (not of Virior).—Auvp. Orn. Biog. I, pl. 58.—Is. B. A. 
I, pl. 47.—Maxim. Cab. Jour. VI, 1858, 100. 
Hab. Entire United States from Atlantic to Pacific, and along central 
region to Arctic Ocean and Fort Yukon; Panama, in winter. Not noted at 
Cape St. Lucas, in Mexico, or West Indies. 
(No. 18,322, 5.) Top of head glossy black, with greenish lustre; back 
and scapulars similar, but rather duller, and somewhat streaked by the 
appearance of the white sides of the feathers—the bases of the feathers, 
however, being plumbeous. Chin, throat, and sides of head chestnut brown, 
this extending round on the nape as a distinct continuous collar, which is 
bounded posteriorly by dull grayish; the chestnut darkest on the chin, with 
a rich purplish tinge. Rump above and on sides paler chestnut (sometimes 
fading into whitish). Upper tail coverts grayish-brown, edged with paler, 
lighter than the plain brown of the wings and tail. Forehead, for the length 
of the bill, creamy white, somewhat lunate, or extending in an acute angle a 
little over the eye; a very narrow blackish frontlet; loral region dusky to 
the bill. A patch of glossy black in the lower part of the breast, and a few 
black feathers in the extreme chin, the latter sometimes scarcely appreciable. 
Under parts dull white, tinged with reddish-gray on the sides and inside of the 
wings. Feathers of crissum brownish-gray, edged with whitish, with a tinge 
of rufous anteriorly (sometimes almost inappreciable). 
(No. 18,322.) Total length, 5.10; wing, 4.50; tail, 2.40, nearly even; 
difference of primary quills, 2.10; length of bill from forehead, .38, from 
nostril, .25, along gape, .60, width, .50; tarsus, .48; middle toe and claw, .72, 
claw alone, .22; hind toe and claw, .44, claw alone, .20. 
There is some variation in amount and shade of rufous in different 
specimens. Usually there is none on the sides of body, and very 
little at the base of the crissum. The rufous of the rump is always 
lighter than that of the throat, where this color extends down on 
the jugulum, with indistinct rounded outline behind, shading into 
the smoky, reddish-gray of the sides of the breast. 
As in its allies, immaturity is shown longest in the absence or 
