GLOSSARY OF TECHNICAL TEEMS. 



75 



Dimorph'ic, a. Existing in two forms, as some species of insects. 

 Dimorph'ism, n. The state of existing in two forms. (The nearest 



approach to dimorphism among birds is the state of dichromatism, 



which see.) 

 Disc, ) Set of radiating feathers surrounding the eye in some birds, 

 Disk, \ n ' especially the Owls. 

 Dis'tal, «. Toward or at the extremity. ( Opposite of proximal, or toward 



the base.) 

 Dis'tichous (L. dis'lichus), a. Two-rowed, as the webs of a feather. 

 Ditok'ous, a. Producing but two eggs for each clutch, as the Pigeons 



(Columbidoz) , Humming-birds (Trochilidaz), and a few other groups. 

 Diur'nal (L. diurna'lis), a. Pertaining to the daytime. Among birds, 



those which are active during the daytime and repose at night. 



(Many diurnal birds, however, are nocturnal in their migrations). 



Divar'icate (L. divarica'tus), a. Spreading or curving apart. 



Dor'sal (L. dorsa'lis), a. Pertaining to the back. 



Dor'sum (L), n. The back. (Plate XL) 



_. , , . ( (L. biemarqina'tus) , a. A doubly emarqinate tail 



Double-emarginate, \ v , ., - 7 .,,." , , . , 3 . ^, ■*' .. ... 

 _ , , °. . < has the middle and lateral feathers slightly 



Doubly emarginate, f , ., „. ., . , . ° J 



v. longer than the intervening ones. 



Double-forked \ ^' bif urca ' tus )> a - A doubly forked tail has the middle 



Doubly forked' ) anc * ^ atera l feathers decidedly longer than those 

 ' ' between. 



(L. birotunda'tus), a. A doubly rounded tail has the 

 middle and lateral feathers shorter than those 

 between. 



Down (L. floc'cus), n. Small soft decomposed feathers, which clothe the 

 nestlings of many birds, and which also grow between and under- 

 neath the true feathers in the adults of many others, especially the 

 various kinds of water-fowl. 



Down'y (L. pubes'cens), a. Pertaining to or having the nature of down, 

 or clad with down. 



Drab, n. A brownish gray color. (Black -|- white -f- raw umber.) (Plate 

 III. fig. 18.) 



Drab-Gray, n. (Black + white -f burnt umber.) (Plate II. fig. 13.) 



Dragon's-blood Red, n. A rich brownish red color, of a peculiar tint. 

 (The pigment called dragon's blood is made from the inspissated juice 

 of certain tropical plants, particularly the Calamus draco and Dracozna 

 draco.) (Light red + madder-brown.) (Plate IV. fig. 8.) 



Dusk'y (L. obscu'rus ; nigres'cens ; nigricans), n. or a. A dark color of 

 more or less indefinite or neutral tint ; of a dark, indefinite color. 



Dysporomorph'ae (L.),n. The Huxleyan name ( meaning gannet-formed) 

 for the Steganopodes. 





Double-rounded, 

 Doubly rounded, 



