THE RUBY-THROATED HUMMING-BIRD. 
199 
widely apart. The bronchial rings are similar, and differ from those of most 
birds in being complete. The two bronchi lie in contact for 2 twelfths at 
the upper part, being connected by a common membrane. The lateral 
muscles are extremely slender. The last ring of the trachea is four times 
the breadth of the rest, and has on each side a large but not very prominent 
mass of muscular fibres, inserted into the first bronchial ring. This mass 
does not seem to be divisible into four distinct muscles, but rather to 
resemble that of the Flycatchers, although nothing certain can be stated on 
this point. 
The Trumpet-flower. 
Bignonia radicans, Willd. Sp. PI., vol. iii. p. 301. Pursh, Flor. Airier., vol. ii. 
p. 420. — Didynamia Angiospermia, Linn. — Bignonia, Juss. 
This splendid species of bignonia , which grows in woods and on the 
banks of rivers in all the Middle and Southern States, climbing on trees 
and bushes, is distinguished by its pinnate leaves, with ovate, widely ser- 
rate, acuminate leaflets, and large scarlet flowers, of which the funnel- 
shaped tube of the corolla is thrice the length of the calyx. The pods are 
of a brown colour, from four to seven inches long, and contain a double 
row of kidney-shaped light brown seeds. 
Genus II.— SELASPHORUS, Swains. RUFFED HUMMING-BIRD. 
> 
Bill long, straight, subulate, extremely slender, somewhat depressed at 
the base, acute ; upper mandible with the dorsal line straight, the ridge 
narrcJw at the base, broad and convex toward the end, the sides convex, 
the edges overlapping, the tip acuminate ; lower mandible with the angle 
very long and extremely narrow, the dorsal line straightish, the edges erect, 
the tip acuminate. Nostrils basal, linear. Head of ordinary size, oblong ; 
neck short ; body short and ovate. Feet very small ; tarsus very short, 
feathered more than half-way ; toes small, the lateral equal, the third not 
