pbocellaeiidjE—pbocellaeiinj^: petrels. 779 
culmen 2.00; height or width of bill at base 0.75; nasal tube 0.67; the bill is really very- 
stout, only slender " in comparison with the short robust organ of the common fulmar. 
Young not seen; changes of plumage probably coincident with those of Fulmarus. A species 
described under a large and not select assortment of names, both generic and specific, but easy 
to identify ; wide ranging over much of the water of the world ; occurs on the Pacitic^ coast 
of N. Am., as at Kotzebue-Sound. 
323. DAP'TIUM. (Gr. 8dnT(o, dapto, 1 devour.) Pigeon Petrel. Bill much shorter than 
head or tarsus, very stout and especially wide, as broad as high as far as the hook, where ab- 
ruptly compressed ; culmen nearly straight from tube to hook, which latter is neither large nor 
much decurved ; sides of bill turgid, with convex outline from base to hook ; forks of lower 
mandible wide apart, enclosing a flat-iron shaped space ; rictus ample ; skin of throat loose and 
distensible, partly naked ; gonys very short, with slight angle; inside the edge of the upper 
mandible a series of oblique ridges; nasal case i as long as culmen, broad, depressed, Math cir- 
cular truncate orifice. (Chars, of bill approaching those of Prion.) Wings folding about to 
end of the short rounded tail, which is contained 2i times in length of wing. Tibiae little bare 
below ; tarsus much shorter than middle toe and claw, stout, compressed, reticulate with small 
circular plates outside, large inside ; outer toe without claw longer than middle toe alone ; hind 
toe well developed for this family. Small ; plumage spotted. One species. 
818. D. eapen'se. (Of the Cape of Good Hope.) Pintado Petrel. Cape Pigeon. Damier. 
Spotted above with blackish and white ; white below ; tail black-barred ; bill black. Length 
15.00; wing 11.00; tail 4.50; bill 1.33; tarsus 1.67. Southern Seas at large ; accidental on 
coast of California and of Maine. (See especially N. Eng. Bird-Life, ii, 1883, p. 386.) 
CESTRE'LATA. (Gr. oio-TprjXaros, oistrelatos, goaded on by a gad-fly.) Gadfly Petrels. 
Diabolic Petrels. Bill about as long as tarsus, stout, compressed throughout, with nearly 
straight converging lateral outlines, the hook particularly large, high-arched, long-decurved, 
rising almost immediately from the end of the nasal tube, leaving but a short concave culmen 
proper. Lateral horny piece of the bill very large, turgid, rising high at root of nasal case, 
convex along under outline; commissure strongly sinuate throughout; outline of mandibular 
rami nearly straight, of gonys a little concave, the tip of the under mandible being curved 
down to fit the arch of the hook. Grooves of both mandibles distinct. Nasal case of moderate 
length, high, not carinate, about straight, truncate at end, with thin partition between the 
tubes coming well forward. Interramal space narrow, fully feathered. Wings pointed, very 
long, folding beyond end of tail. Tail long, -with graduated feathers, ■wedge-shaped or much 
rounded. Feet of moderate size; tarsus reticulate, about as long as, or little shorter than, 
middle toe without claw ; outer toe alone rather longer than middle ; with its claw, about as 
long as middle toe and claw ; tip of inner claw reaching base of middle. Hallux a short ses- 
sile claw. A genus of numerous (about 20) medium-sized and rather small species, inhabiting 
the southern seas ; some bicolor, others uniform fuliginous. Our four are mere stragglers to 
N. Am., unless (E. fislieri should prove otherwise. 
819. OE. haesita'ta. (Lat. hcBsitata, stuck ; the describer was in doubt about it.) Black-capped 
Petrel. Adult : Forehead, sides of head, neck all round, upper tail-coverts, base of tail and 
all under parts, white; back clear bistre-brown (nearly uniform, but the feathers often with 
paler or ashy edges), deepening on the quills and terminal half of tail; crown with an isolated 
blackish cap, and sides of head with a black bar (younger birds with the white of the head and 
neck behind restricted, so that these dark areas run together) ; bill black ; tarsi and base of 
toes and webs, flesh-colored (drying yellowish) ; rest of toes and webs black. Young exten- 
sively dark below? Length 16.00; wing 12.00; tail 5.25, cuneate, its graduation 1.50 ; tarsus 
1.40 ; middle toe and claw 2.12; bill 1.40, 0.66 deep at base, 0.40 wide ; tube 0.33. Of casual 
occurrence on the Atlantic Coast, U. S. (P. meridionaliSj Lawr., Ann. Lyc. Nat. Hist. N. Y., 
iv, p. 475 ; V, p. 220, pi. 15.) 
