ee . Tertials conspicuously elongated, reaching 
nearly if not quite to tips of longest 
primaries, the bill slender almost subulate* 
Hotacillidae * 
* . < _ .1 I m % ; i ‘ 
dd* Width of bill at rictus equal to or 
greater than- length of culmen* 
Proc^atidae . 
' 4k. ' • . , 
* V V- •- * ^ • ■ - -% * . •- .. .*■ .- 0 . 
cc * Longest jjrirnaries more than twice as long 
as secondaries* 
' • • t- . • i 
Hirundinidae . 
bb . Tip of maxilla abruptly uncinate, the 
bill narrow and straight; maxillai’y tomium 
not toothed subterminally. 
Tireonidae part. 
aa * Outermost obvious primary (tenth) not 
more than half as long as the next, usual¬ 
ly shorter, sometimes rudimentary ("Ten- 
primaried Oscines’’.) 
b. Basal phalanx of middle toe adherent 
• for entire length to both lateral toes, 
the hallux not longer than outer toe* 
Yireonidae part* 
bb . Basal phalanx of middle toe free from 
inner toe for most if not all its length, 
and from outer toe for (approximately) 
half its length, or else (Troglodytidae) 
hallux decidedly longer than outer toe. 
c_. nostrils covered (at least partly) by 
tuft of antrorse plumules, or else expos 
ed circular, without superior membrane 
or operculum, the tenth primaiy abait 
half as long as ninth. 
Corvidae. 
