NO. 2131. NEMATODE PARASITES OF RODENTS— HALL. 145 



STRONGYLUS species Lutz, 1894. 



Specific diagnosis. — None. 



Host. — Epiinys norvegicus (Mus decumanus). 



Location. — Small intestine. 



Locality. — Sao Paulo, Brazil. 



In a paper on Taenianana {Hymenolepis nana)., Lntz (1894) states 

 that in examining Mus decumanus at Sao Paulo, Brazil, he found, in 

 the small intestine of one rat, one male of a probably undescribed 

 species of Strongylus. There are no further data or description of 

 any sort. 



STRONGYLUS SIMPLEX Leidy, 1856. 



Speci-fic diagnosis. — ( ?) Trichostrongylinae (p. 123) : "Body cylin- 

 droid, anteriorly rather abruptly narrowed. . . . Head obtusely 

 conical, not alated nor papillated." 



Blale 5 to 7.5 mm. long and 335 ju, thick. " Body . . . curved, with 

 the caudal extremity incurved." Bursa with a dorsal and two lateral 

 lobes sustained by rays. 



Female 8 to 10 mm. long and 500 ix thi^k. Body straight. Tail 

 compressed, conical, and acute. Vulva one-third of body length from 

 posterior extremity. 



Host. — Erethizon dorsatum, {Ilystrix dorsata). 



Location. — Small intestine. 



Locality. — North America. 



It is impossible to locate this species generically on the basis of the 

 above description. 



STRONGYLUS SEDECIMRADIATUS von Linstow, iSgg. 



Synonym. — Stro7igylus sedecinradiatus Linstow, 1890, of Travas- 

 sos, 1914^>. 



Speci-fic diagnosis. — ( ?) Trichostrongylinae (p. 123) : The cylindri- 

 cal head end is separated from the remainder of the body by a circu- 

 lar furrow. Cuticle strongly striated transversely. 



Male 8.2 mm. long and 110 [k thick. The esophagus is 1/14.2 of the 

 total body length. The bursa has a veiy large dorsal and two lateral 

 lobes (fig. 192). The extenio-lateral and medio-lateral rays are close 

 together and parallel. x\ll other rays diverge from adjacent rays. 

 There are two dorsal rays, slightly divergent, which send out an 

 exteiTio-dorsal ray laterally a short distance from their proximal 

 origin and then bifurcate to form the two distal branches. The 

 spicules are 530 \i long. 



Female 16.2 mm. long and 180 ju, thick. The distance from the 

 anus to the tip of the tail is one sixty-eighth of the body length. 

 The eggs are 59 by 31 jU, in diameter. 



Host. — Cuniculus pcwa {Coelogenys paca., Cavia paca). 

 10600°— Proc.N.M.vol..50— 16 10 



