NO. 2131. 



NEMATODE PARASfTE^ OF RODENTS— HALL. 



131 



37jii long. It divides distally to form two terminal forks about 16 fi 

 long. At the base of these forks are two very short lateral spurs 

 externally. The spicules are short, 140 to 155 [x long, and apparently 

 twisted. The gubernaculum is canoe-shaped and is 70 to 80 [i long. 

 The spicules and gubernaculum are curved, presenting a convexity 

 dorsally. 



Female 6 mm. long with a maximum thickness of 103 ju, in the 

 vicinity of the vulva. Cervical fold 95 to 125 yu, back of the head end. 

 Anus 75 to 100 /^ from the tip of the acutely pointed tail (fig. 164). 

 Vulva 1.22 to 1.245 mm. from the tip of the tail. Combined length 



Fig. 1(313.— Trichostrongylus deli- 



CATUS. Bursa, LATERAL VIEW, d., 



Dorsal ray; e. d., externo-dorsal 

 ray; e. I., exteeno-lateral rays; 



I. v., LATERO-VENTRAL RAY"; m. I., 



medio-lateral rays; p. I., postero- 

 lateral rays; v. v., ventro-ven- 

 tral ray. enlarged. 



Fig. 163.— Trichosxrongylus delxcatxis. 

 Bursa, latero-ventral view. e. I., 

 Externo-lateral rays; gub., guber- 

 naculum; I. v., latero-venteal r.^ys; 

 m. I., medio-lateral ray's; p. Z., postero- 

 lateral ray; v. y.,VENTRO-VENTRAL RAYS. 



Enlarged. 



of muscular portions of ovijectors between the sphincters, 490 p. (fig. 

 165). Eggs 85 by 50 fi in diameter, segmenting at oviposition. 



Host. — Sciurus aberti inimus. 



Location. — ^Small intestine. 



Locality. — Pagosa Springs, Colorado. 



Tijpe material. — No. 16571, U.S.N.M. (Bureau of Animal Industry 

 helminthological collection). This species was collected from some 

 of Mr. E. E. Warren's alcoholic host material. 



Genus NEMATODIRUS Ransom, 1907. 



Generic diagnosis. — Trichostrongylinae (p. 123) : Head not over 

 50 [x in diameter; circumoral papillae inconspicuous. Cuticle of 

 head may be inflated and in cervical and head region striated trans- 

 versely. Cervical papillae apparently absent. Bursa without un- 

 paired dorsal median ray. Dorsal lobe of bursa reduced to two small 



