PLUVIALIN^E. 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 

 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{$, H> i 4 ITI, it> iV Female, 9J, 18. 



