C. Wellman and W. B. Wherry 
421 
Type in collection of Creighton Wellman. 
Host. 0. heecheyi in small cysts in the liver substance. 
Remarks. This cystocercus comes nearest to G. longicollis Rod., but 
is easily told from it by the fact that in longicollis the neck is longer 
than the body and the body darker than the neck, which features do not 
hold for our species. The character of the calcareous granules is also a 
differential point and according to Dujardin {Hist. Nat. d. Helm. 1845) 
the hooks in longicollis are different from those of our worm (Fig. 8). 
C. longicollis is said to occur in moles and voles, and the adult {Taenia 
crassiceps, Zeder) to infest foxes. It is not improbable, therefore, as 
Dr Ransom, of Washington, first suggested to one of us, that the adult 
form of our worm will be found in coyotes or some such animal. 
Acarina. 
Genus Cytoleichus M^gnin. 
Cytodites Megnin. 
Cytolichus Auctt. 
Cytoleichus banksi sp. nov. 
Resembles in its general features 0. nudus, Vizioli. Body rounded, 
broadly oval, whitish, almost glabrous, not striated, but with very fine 
irregular, faintly marked ridges on the epidermis. Haustellum shorter, 
broader and more truncate than in nudus, viz. broadly conical, without 
cheeks. Legs strong, narrowly conical, composed of five articles and 
terminating in a non-armed pulvillus on a nearly transparent pedicle 
(Fig. 10) and a long, transparent seta. Sexual dimorphism not well 
marked : in the ? ? a genital pore (vulva or tocostome) may be made 
out in the median line between the next to last pair of legs. Average 
length 0’2 mm., average width 0T5 mm. 
Type in the collection of Creighton Wellman. 
Host. 0. beecheyi (lungs). 
Remarks. This species, the type of which was submitted to Mr 
Nathan Banks the eminent arachnologist and pronounced by him to be 
new, we place in the Cytoleichidae on account of the longitudinal genital 
aperture of the $. The specimens were found July 8, 1909, occurring 
in large numbers in small grayish, rounded, slightly raised tubercles on 
the lungs of two specimens of ground squirrels. The tubercles also exist 
in the deeper lung tissue. One mite was found in each tubercle 
