NO. 2131. NEMATODE PARASITES OF RODENTS—HALL. 187 



States. Specimens from Oklahoma are in the material collected by- 

 Mr. Douthitt. I have tentatively assumed that a cottontail from Sul- 

 phur, Oklahoma, would bos'. /. alacer. The specimens from Lepus 

 campestrls were determined by Stiles and Hassall, but there is no 

 data as to the geographic locality. 



FILARIA MURICOLA (von Linstov/, 1905) Hall, 1916. 



Synonym. — Spiroytera muricoTa von Linstow, 1905. 



SpecifiG diagnosis. — Filaria (p. 179) : 



Male not known as adult. 



Female not laiown as adult. 



Larva 2G nun. long and 500 ^ thick. The head end is bluntly flat- 

 tened and bears four small papillae in a circle. The esophagus is 

 one-eleventh of the entire lengtli and is suiTounded by the nerve ring 

 350 IX from the anterior extremity- The very short tail end is rounded 

 and bears a very small fingerform projection. The tail is one two- 

 hundred-and-twenty-first of the entire body length. The poly- 

 myarian musculature is powerfully developed and fills the body cav- 

 ity to such an extent that it borders on the esophagus and intestine 

 mediall3\ The lateral lines comprise one-seventeenth of the entire 

 circumference and are separated, as usual, by the musculature. These 

 lateral lines are wedge-shaped in cross section. The dorsal and 

 ventral lines are feebly developed. Sex organs are not present. 



Host. — E pimys surifer (31 us surifer). 



Location. — Subcutaneous connective tissue of the feet. 



Locality. — Siam. 



There is nothing in this description to warrant the belief that this 

 species belongs in the genus Spiroptera as generally understood, even 

 leaving out of consideration the fact that Spiroptera is a synonym of 

 Acuaria. On the other hand, the location of the parasite in" sub- 

 cutaneous tissue points to its being a Fllavia., a supposition that is 

 not discordant with the description. The species has therefore been 

 transferred to that genus. 



FILARIA LEPORIS Gmelin, 1790. 



Synonym. — Filaria Icporis {subcutanea) Rudolphi of JMolin, 1858&. 



Specific diagnosis. — Filaria (p. 179) : None given. 



Host. — Lepus timidus. 



Location. — Lumbar region. 



L ocality. — Southern Ru ssi a. 



Gmelin did not describe this species and other writers, noting the 

 species, have merely cited Gmelin. The name is therefore a noinen 

 nudum. 



