366 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 
Heteractitis¢ Stresnacer, Auk, i, July, 1884, 236. (New name to replace 
Heteroscelus Baird, thought to be preoccupied.) 
Medium-sized Tringine (wing 160-180 mm.) with stout bill, tarsus. 
shorter than exposed culmen (though longer than middle toe with 
claw), planta tarsi with scutella small (sometimes broken or irregular), 
and color of upper parts wholly plain brownish gray. 
Bill straight and rather stout, its depth at base equal to nearly 
one-sixth the length of exposed culmen, the latter longer than tarsus; 
nasal groove broad, extending half way to tip of maxilla (in Z. 
brevipes) or two-thirds the distance (in H. incanus); gonys about as 
long as mandibular rami (H. brevipes) or decidedly shorter (ZH. 
incanus), faintly convex; culmen slightly but decidedly decurved 
terminally. Wing long and pointed, the longest primary (outermost) 
exceeding distal secondaries by about one-half the length of wing. 
Tail nearly half as long as wing (somewhat shorter in H. brevipes), 
very slightly rounded. ‘Tarsus slightly shorter than exposed culmen 
but longer than middle toe with claw, the acrotarsium with trans- 
verse, slightly oblique, scutella, these becoming smaller and finally 
broken into small scales on upper portion; planta tarsi with the 
scutella much smaller, sometimes broken up into small scales; bare 
portion of tibia short (much less than half as long as middle toe), 
covered with small scales, those on posterior side sometimes in form 
of small transverse scutella; lateral toes decidedly shorter than 
middle toe, the outer toe slightly longer than the inner one; basal 
phalanges of outer and middle toes connected by a deeply incised 
web, but web between inner and middle toes much smaller, practically 
absent. 
Coloration.—Above plain brownish gray, the remiges, primary 
coverts, etc., darker; beneath white, more or less barred with brown- 
ish gray or dusky in summer, clouded or suffused with grayish ante- 
‘Tiorly and laterally in winter. 
Range.—Coasts and islands of Pacific Ocean. (Two species). 
KEY TO THE SPECIES OF HETEROSCELUS. 
a, Nasal groove (measured from latero-frontal antia) much more than half (about 
two-thirds) as long as exposed culmen; upper tail-coverts uniform gray, or 
merely edged (narrowly) with white; summer adults with abdomen and under 
tail-coverts barred with dusky. (Alaska and Yukon Territory to northeastern 
Siberia, migrating to Lower California, Galapagos Islands, Hawaiian Islands; 
CLG: oe cmameacnieeesisiclacinsicmjimaaanoa a> bahacnamenn Heteroscelus incanus (p. 367) 
aa. Nasal groove (measured from latero-frontal antia) only about half as long as ex- 
posed culmen; upper tail-coverts distinctly barred with white; summer adults 
with abdomen and under-tail coverts immaculate white. (Shores and islands of 
@ From érepos=different and 6 dxrirns==an inhabitant of the shore. (Stejneger.) 
