ANATID^ — ANATIN^ : RIVEB BUCKS. 689 



leucoparia Brdt. ? But not leiicoparia Cass. Not in the Check List, 1883, not having been 

 there tbrmally recognized as a subspecies.) 



03. B. c. leucopari'a. (Gr. XevKos, leukos, white ; wapeid, pareia, cheek.) Smaller White- 

 cheeked Goose. Similar to the last in color; but much smaller, and tail 16-feathered, thus 

 resembling No. 704, from which distinguished as ocddentalis is from canadensis. Length 24.00 

 or less; wing about 15.00. This is the small "white-necked goose" figured by Cassin, lU., 

 pi. 45, as B. leucoparia, Brandt. Pacific coast, especially Alaska. 



04. B. c. hut'chiusi. (To Mr. Hutchins.) Hutchins' Goose. Tail normally 16-feathered. 

 Coloration as in the Canada goose. Size much less. Length 35.00-30.00; extent about 

 4 feet; wing 15.00-17.00; tail 5.00-6.00; bill 1.50; tarsus under 3.00. There seems little 

 probability of establishing good character of more than one species of the canadensis group, 

 with probably four varieties : large, no coUar (702) ; small, no collar (704) ; large, collared 

 (702a) ; small, collared (703). 



83. DENDROCY'GNA. (Gr. ShSpov, dmdron, a tree; Lat. eygnus, a swan.) Tree Ducks. 

 Duck-like arboricole geese, with the bill longer than the head, terminated by a prominent 

 decurved naU, the lamellae not projecting ; nostrils small, oval, in basal half of bill ; legs very 

 long, the tibiae extensively denuded below ; hind toe lengthened, more than one-third as long 

 as the tarsus ; tarsi entirely reticulate, as in geese proper. Wings ample, rounded ; 1st quiU 

 shorter than 4th. Coloration variegated. Sexes similar. Nest in trees. In addition to the 

 two following species, a third, Z). arborea, of the West Indies, may occur in the South. 



Analysis of Species. 



Bill and feet blackish ; coloration largely cinnamon ; no white wing-patch falva 705 



Bill and feet reddish ; coloration largely blackish -, a large white wing-patch a/utumnalis 706 



r05. D. ful'va. (Lat. fulva, fulvous, reddish.) Fulvous Tree Duck. BUI bluish-black ; 

 feet slaty-blue. Pale cinnamon or yellowish-brown, extensive and uniform on the lower parts, 

 darker on head ; nape and hind-neck with a black line ; scapulars and fore-back blackish with 

 pale cinnamon edgings of the feathers. Rump and tail black ; upper and under tail-coverts 

 white. No white speculum on wing ; lesser wing-coverts chocolate-brown ; rest of wing black 

 on both surfaces. Length about 20.00; extent 36.00; wing 9.50; tail 3.35; tarsus 2.25 ; bill 

 1.50, with hooked nail. S. W. U. S. and southward, in summer, Louisiana to Cala. ; common 

 on the Rio Grande. 



f06. D. autumua'Ils. (Lat. autumnalis or aiictiimnalis, of the period of increase, of harvest ; aitctes, 

 increased, augmented.) Autumnal Tree Duck. Bill coral-red, with orange above, and 

 bluish nail; feet pinkish-white. A large white speculum, consisting of greater wing-coverts 

 and basal parts of most of the quills, as well as spurious quiUs and outer webs of one or two 

 primaries. Head and neck reddish-chocolate, paler on cheeks and chin, with black stripe 

 down nape and hind-neck, passing through more yellowish-brown on the fore-parts of the 

 body to blackish on lower back, rump, tail, belly, sides of body and lining of wings ; flanks 

 and crissum mostly white. Length about 30.00; extent 36.00-38.00; wing 9.50-10.50; 

 tail 3.00; bill along gape 2.00; tarsus 2.25. S. and C. Am. and Mex. to Texas, abundant 

 from April to October on the Rio Grande, where called "cornfield duck;" a common market- 

 bird in some places. Nest in hollows of trees, often at a great distance from water, to which 

 the young are transported by the parents in the bill. Eggs 12-16, 2.10 X 1.50, of usual duck 

 shape, buffy-white. 



67. Subfamily ANATIN/E: River Ducks. 



Tarsi scutellate in front; hind toe simple (in FuUguliMce, the hind toe with a flap or 

 lobe.) This expression separates the present group from all the North American examples 

 of the foregoing and succeeding subfamilies, although it is not a perfect diagnosis. The neck 

 and legs are shorter than they average in geese, while the feet are smaller than in the sea- 



