60 PROCEEDING.^ OF THE NATIONAL MUSEUM. vol. 50. 



filled with uterine convolutions distended with eggs. Apparently two 

 uterine branches. The eggs (fig. 69) are of the same tj^pe as those 

 of Oxyuris, elongated, flattened on one side and the ends terminatirig 

 in rounded points. They are 98 to 100 fi long and 35 /x thick. 



Host. — Eutamias amoenus operarius. 



Location. — Cecum and large intestine. 



Locality. — San Acacio, Costilla County, Colorado. 



Type Tnaterlal. — No. 16637, U.S.N.M. (Bureau of Animal Industry 

 helminthological collection). 



It seems probable that the males in the writer's possession are 

 sufficiently mature to have the spicules developed, as the eggs in the 

 females show various segmentation stages. 



Genus ALLODAPA Diesing, 1861. 



Synonym. — Not Allodapa Brunn, 1878, orthopteron; Oxynema von 

 Linstow, 1899. 



Generic diagnosis. — Subulurinae (p. 51) : Body reddish in color, 

 thick, attenuated posteriorly, and with two lateral cervical alae. 

 Mouth elongated dorso-ventrall}:^ and surrounded by six papillae. 

 The buccal cavity with a thick chitinous lining in its anterior 

 portion; at its base three small teeth, with a rounded free edge, 

 limiting the entrance to the esophagus. The esophagus is club- 

 shaped posteriorly, and there is a distinct esophageal bulb. The 

 nerve ring surrounds the anterior portion of the esophagus and the 

 ventral excretory pore is posterior of the nerve ring. The vulva is 

 anterior of the middle of the body and is not prominent. The ovi- 

 jector is directed anteriorly and is characterized by a very long 

 sphincter, presenting at one point a globular secreting portion where 

 the ^gg remains some time before oviposition. The male has straight 

 caudal alae. There are two spicules, terminating in fine points, and 

 a triangular gubemaculum. The sucker is some distance from the 

 cloacal aperture, devoid of a chitinous ring and shows radiating 

 muscular fibers. 



Type-species. — Allodapa allodapa (Creplin, 1853) Seurat, 1914:rt. 



Seu'rat (1915e) states that the type of Oxynema^ 0, rectum^ is 

 identical with Allodapa crassispicuhim. 



ALLODAPA ELONGATA Seurat, 1914c. 



Specific diagnosis. — Allodapa (p. 60) : Long, slender worms, with 

 straight cervical alae which are finely striate transversely and do 

 not extend posterior of the middle of the esophagus. Mouth sur- 

 rounded with six papillae. The buccal cavity (fig. 70) divided into 

 two parts, the anterior portion with a thick chitinous lining, the 

 posterior portion with a separate thick chitinoife lining and with 

 three cuneiform, sharp-pointed, slightly bent teeth. 



