PLUVIALINiE. STREPSILAS. 
57 
middle, compressed until towards the end, when it becomes 
depressed ; upper mandible with its dorsal line slightly con- 
cave, the ridge somewhat flattened, the edges rather sharp 
and slightly deflected, the tip depressed and blunt ; lower 
mandible with the angle narrow, the dorsal line ascending 
and slightly convex, the sides grooved at the base, convex 
toward the end, the edges a little involute, the tip depressed 
and blunt ; the nasal groove half the length of the bill ; the 
gape-line very slightly recurvate. Eyes of moderate size. 
Nostrils linear, pervious. Aperture of ear moderate. Legs 
slender, of moderate length ; tibia bare for a short space ; 
tarsus rather short, somewhat compressed, with numerous 
anterior scutella ; toes four, the first very small, the anterior 
of moderate length, slightly webbed at the base, the second 
a little shorter than the fourth ; claws short, compressed, 
arched, obtuse ; that of the hind toe more curved and acute. 
Plumage rather compact above, blended beneath ; scapulars 
elongated and narrow ; wings long, narrow, pointed, of twenty- 
| six quills ; primaries tapering, the first longest, the rest 
| rapidly decreasing ; inner secondaries greatly elongated and 
j tapering ; tail rather short, a little rounded, of twelve rather 
broad rounded feathers. 
This genus is very intimately allied to Ostralegus, agree- 
ing with it in every particular, excepting the form of the 
bill, especially at its tip. 
174. Strepsilas Interpres. Collared Turnstone. 
Adult in winter with the middle of the back and the lower 
parts white, the fore-neck black ; the upper parts blackish- 
brown. In summer the upper parts variegated with black 
and brownish-red. The bill black, the iris brown, the feet 
reddish -orange, the claws black ; the primaries and coverts 
brownish-black, the secondaries more brown ; all in their 
lower part, the outer secondaries at their extremities, and the 
shafts of the primaries, white, of which colour also are the 
tips of the secondary coverts, and the inner secondaries, to- 
gether with some of the smaller wing-coverts ; the tail white 
at the base, brownish-black toward the end, edged externally 
with light brown, the outer web of the outer, and the tips of 
all, excepting the two middle feathers, white. 
Male, 9, {§, 18±f, yf, 6 T %, lyV; If; iV Female, 9J, 18. 
