DUSK! GROUSE. 
89 
only 21 twelfths ; pn their inner surface are six longitudinal villous ridges, 
the intervals between which are also covered with prominent villi, as is the 
whole interior of the intestine. There is no enlargement of the rectum. 
The trachea is 5i inches long, much flattened, at first 3 twelfths in 
breadth, presently contracting to 2% twelfths, and so continuing until 
toward the lower end, where it gradually enlarges to 3? twelfths. The 
rings are very feeble, slightly ossified, 102 in number, with 2 dimidiate 
rings. The lateral muscles are slender, as are the sterno-tracheal. There 
are no inferior laryngeal muscles. 
Trillium Pictum, Pursh, Flor. Ainer. Sept., vol. i. p. 244. — Hexandria, Trigynia, 
Linn. 
This plant, as well as the other species represented, grows abundantly in 
Maine, in all such secluded places as are frequented by the Spotted Grouse, 
which eagerly devours its berries. It has ovate acuminate leaves, of a light 
green colour, thin and undulated ; an erect peduncle ; white flowers, veined 
with purple at the bottom, and having the petals lanceolate, recurved, nearly 
twice the length of the calyx. The berries are ovate and of a scarlet colour. 
Streptopus distortus, Mick ., Flor. Amer., vol. i. p. 200. Pursh , Flor. Amer. 
Sept., vol. i. p. 232. — Hexandria, Monogynia, Linn. 
About two feet high, with alternate, amplexicaul, ovate, acute, ribbed, 
light green leaves ; greenish-yellow flowers, on pedicels which are distorted 
in the middle ; and oval scarlet berries. 
DUSKY GROUSE. 
Tetrao OBSCURUS, Say . 
PLATE CCXGY. — Male and Female. 
As I have never seen this species in its native haunts, I am obliged to 
have recourse to the observations of those who have had opportunities of 
studying its habits. The only accounts that can be depended upon are those 
of Dr. Richardson, Mr. Townsend and Mr. Nutt all, which I here give 
