728 U. 8S. P. R. R EXP. AND SURVEYS—-ZOOLOGY—GENERAL REPORT. 
appearance of the other. It is seldom, if ever, expanded laterally near the tip. The difference 
in cleft of the mouth is very striking—this always extending behind the base of culmen, 
sometimes nearly to the eyes, instead of merely reaching to or even falling short of the beginning 
or base of culmen. This appears to indicate a radical difference in the character of food, the 
Totaneae being capable of feeding on hard substances of rather large size, while the food of 
Tringeae is softer, smaller, and sucked into the mouth, rather than taken in any other way. 
A strong mark of distinction for the North American species, at least, is seen in the conspicuous 
transverse bars of the tail in Zotaneae, scarcely ever found in Tringeae, although occurring again 
in Scolopaceae. The single exception is seen in the genus Heteroscelus, in which the upper 
plumage is entirely uniform, without bars or spots anywhere. The tarsus is covered laterally 
and behind with hexagonal scales, somewhat as in Strepsilas, but they are more irregular. 
Synopsis of genera. 
A. Bill with the upper mandible grooved only for about basal half; rather longer than the 
head; commissure bent slightly upwards from the middle. Tarsi scutellate behind, with 
transverse scales. 
Both outer and inner toes webbed. 
Sympuemra.—Bill very thick, recurved. Tarsus 13 times the middle toe. 
Inner toe separated from middle nearly to base. Bill more slender. 
Guorris.—Bill stouter and higher at base than in others of the section ; more 
recurved. Legs green. 
Gampetta.—Legs lengthened ; tarsus 14 times the middle toe. Legs yellow. 
Ruyacnopuitus.—Legs short ; tarsus equal to the middle toe. 
B. Bill as in preceding ; the nasal groove extending a little further forward. Commissure 
straight. Tarsus with polygonal small scales behind, (only present here among Totaneae.) 
Hereroscetus.—Bill much longer than the tarsus, which equals the middle toe. 
Legs short. Outer toe webbed. 
C. Bill with the upper mandible grooved on the side for three-fourths or more its length ; 
not longer than the head, 
Cleft of mouth extending but little beyond the base of culmen. 
Trincorprs.—Bill, tarsus, and middle toe about same length; legs short. Tail 
more than half the wings. Inner toe with very slight basal web. 
Puitomacnus.—Tarsus much longer than middle toe, which is longer than the bill. 
Legs lengthened. Tail not half the wings. 
Cleft of mouth extending nearly to eyes; the culmen two-thirds the commissure. 
Acriturus.—Feathers extending farther on upper jaw than lower. Interspace of 
rami not filled with feathers. Legs long; tarsus 1} times middle toe. Outer 
toe much webbed at base; inner, with very slight web. ‘Tail more than half 
the wing. 
Trynaires.—extending much farthest on lower jaw. Interspace of rami filled 
entirely with feathers. Legs short. Tarsus equal to middle toe; all the toes 
cleft to the base, or with a very short web. ‘Tail not half the wing. 
