622 OHIO BIRDS. 
Decurved. Gradually curved downward. 
Deniirostral. Having the bill notched as if toothed. 
Depressed. Flattened vertically. Opposite of Compressed. 
Desmognathous. Having the palate bones united. 
Diagnostic. Distinctively and exclusively characteristic. 
Diaphragm. Midriffi; musculo-tendinous partition between thorax and abdomen, rudi- 
mentary or wanting in birds. 
Dichromatic. Of two colors, as the ‘‘ red” and ‘‘ gray” plumages of Scops asio. 
Divaricate. Branching off; spreading apart, curving away. 
Dorsal. Pertaining to the back. 
Dorsum. Back; upper surtace of trunk from neck to rump. 
Down. Small seft feathers of plumulaceous structure, generally growing about the 
reots of plume and concealed by them. 
Dusky. Of any undefined dark color. 
\ 
KE 
Hared. Having lengthened or highly colored auricular or other feathers on the side of 
the head. 
Emarginate. Notched at the end; slightly forked, especially in case of a tail so shaped ; 
also notched, or abruptly narrowed along the edge in its continuity, as the border of 
many a wing-quill. 
Epignathous. Hook-billed. 
Erectile. Susceptible of being raised, as a crest. 
Erythrism. A particular state of plumage characterized by excess of red pigment. 
Even. Waving all the feathers of equal length. 
Ii) 
Falcate. Sickle-shaped ; scythe-shaped. 
Family. Systematic group of the grade between order and genus, generally distinguished 
or denoted by the termination -ide. 
Femoral, Pertaining to the thigh, or part of leg from hip to knee. 
Fenestrate. Furnished with openings. 
Ferrugineous or Ferruginous. Rusty-red. 
Filiform. Thread-like. 
Fissipalmate. Lobed and semipalmate as a grebe’s foot Is. 
Fissiped. Having cleft toes Opposed to Palmiped. 
Fissirostral. Having ibe bill cleft far beyond the base of its horny part. 
Flank, Hinder part of side of trunk. 
Forehead. Front of head from bill to crown. 
Foreneck. Whole front of collum, from chin to breast; whole throat. 
Forficate. Deeply forked. 
Forked (tail). Waving the outer feathers longest, the rest gradually successively short- 
ening to the middie pair; when these are again iengthened somewhat, the tail is said 
to be doubly forked. 
Fossa, fosse Used chiefiy in the plural te denote the pits or grooves in which most 
birds’ nostrils open. 
Fossorial, Digging into the earth for its habitation. 
Free. Said of the leg when not enclosed to the knee in the common integument of the 
body. 
ia 
