570 
Journal o f Agricultural Research 
Vol. XXX, No. 6 
Geographic distribution. —Fairfax 
County, Virginia, U. S. A. 
Type and allotype. —U. S. N. M., 
Helm. Coll. No. 25969; paratypes 
No. 25970. One pair deposited in the 
British Museum of Natural History. 
Cyathostoma coscorobae n. sp. (pi. 4, 
fig. 43, 45, 46). 
Syngamus trachealis Wied. (pars), Fox, 1923, 
Disease in captive wild mammals and birds, p. 
650. 
Male 5.5 mm. (estimated) long, 
anterior portion attenuate. Buccal 
capsule with straight sides, its lumen 
83 p in diameter, 100 ju deep, lateral 
walls 13 m thick. Buccal teeth six in 
number, alternate teeth about twice 
size of others, large teeth 33 p high. 
Head papillae, as far as could be de¬ 
termined, as in C. americana. Eso¬ 
phagus about 700 p long, greatest width 
just before the esophago-intestinal 
valve, where it is 150 p in diameter. 
Nerve ring just before the middle of the 
length of esophagus. Cervical papillae 
and excretory pore not seen. Cuticle 
with an exceedingly fine transverse 
striation which is evident only near 
ruptured portions and which may be 
the result of the rupture. 
Caudal bursa well developed; when 
spread 720 p in transverse diameter. 
Ventral rays similar, slender, and ap¬ 
proximate, about 105 ju long; lateral 
rays parallel and continuous through¬ 
out their length; externo-lateral ray 
the shortest (135 p long); medio-lateral 
and postero-lateral rays 150 p and 210 p 
long, respectively; externo-dorsal ray 
165 p long, arising near the base of the 
main trunk of the dorsal ray, which is 
150 p to its bifurication; branches of 
dorsal ray sinuous, each with three 
terminations, as in C. bronchialis. 
Spicules filiform, from 660 p to 720 p 
long, each with a finely striated wing; 
spicules united at tips. Gubernaculum 
present, 92 p long. 
Female about 20 mm. long. Buccal 
capsule trapezoidal in optical section, 
210 p in depth, its walls 30 p thick, 
diameter of the lumen at base 225 p, 
at apex 285 p. Teeth six in number, 
proportionately lower than in male, 
the highest teeth 60 p. Esophagus 
900 p long, its greatest diameter 255 p 
just before the esophago-intestinal 
valve; nerve ring at the anterior, two- 
fifths of the length of the esophagus. 
Cervical papillae and excretory pore 
not seen. Vulva at about the middle of 
the.body length; vagina very short; 
uteri divergent. Tail acute; anus 
225 p before tip. Eggs oval, 80 p long 
by 50 p in transverse diameter, with a 
minute operculum at the slightly 
smaller end. 
Host.—Coscoroba coscoroba (Coscoro- 
ba swan). 
Location. —Trachea. 
Geographic distribution .—South Am¬ 
erica (from captive bird in Philadelphia 
Zoological Park). 
Type and allotype. —U. S. N. M., 
Helm. Coll. No. 26128; paratypes in 
collection of the Zoological Society of 
Philadelphia. 
The specimens upon which the 
above description is based were col¬ 
lected by Herbert Fox and his associates 
from a Coscoroba swan which died 
July 26, 1919. The specimens appear 
to have been left for some time in 
water with the result that all have 
ruptured. Because of this, it has 
been impossible to make accurate 
measurements of the total length or 
of the position of the vulva. 
Cyathostoma sp. 
In the collection of worms received 
from Philadelphia there are three 
female Cyathostoma sp. from the blue¬ 
winged teal (Querquedula querquedula 
discors). One of the three specimens 
is in condition for study and belongs 
to a species of the second group, in 
which the vulva is at or near the middle. 
There is nothing to separate the 
species from C. lari Blanch, except 
that the hosts are widely separated 
phvlogenetically. 
NOTE 
Since the completion of the preseht 
paper, L. Gedoelst 3 has described a 
new Syngamus, S. hippopotami , from 
the hippopotamus, collected at Nyan- 
gwa, Belgian Congo. The worms, 
judging from the photographic illus¬ 
tration are of the laryngeus type; that 
is, the posterior half of the female is 
markedly narrower than the anterior 
half. If this supposition is correct, 
the species need only be compared with 
S. laryngeus Raill. Syngamus hippo¬ 
potami Gdlst. is a much larger species, 
the females ranging from 24 to 34 mm. 
The spicules of the male are smaller 
and are of two sizes, the shorter being 
from 12-18 p, the larger from 18-24 p. 
The dorsal ray is bifurcate clear to the 
base instead of being single, and oc¬ 
casionally each branch bears a small 
lateral subray. In these, as well as 
in other characters, the species is 
quite distinct from S. laryngeus. In 
comparison with species other than S. 
laryngeus, S. hippopotami is readily 
distinguished by the extremely small 
spicules. 
3 Gedoelst, L. un syngame parasite de l’hippopotame. Ann. Par. 2: 307-31J, illus. 1924. 
