222 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



Male 50 mm. long. Posterior extremity spirally enrolled. 



Female. — Posterior extremity curved. 



Host. — Kannabateotnys amhlyonyx {Dactylomys amhlyonyx). 



Location. — Liver. 



Locality. — Brazil (Majo and Ypanema). 



This is one of the species placed by Diesing (1861) in his genus 

 DicheiloneTna. This genus is based on a rather uncertain set of 

 characters. In his generic diagnosis he states that there are usually 

 two ovaries in the female, but occasionally more. The type-species, 

 Dicheilonema Idbiatum (Creplin, 1825) Diesing, 1861, selected by 

 Stiles and Hassall (1905), has five ovaries. Since it is more unlikely 

 that Filaria hifida has five ovaries than that it has two, the genus 

 Dicheilonema has been left out of consideration in this paper. 



FILARIA CONICA Molin, 18586. 



Synonym. — Dicheilonema conicum (Molin, 1858&) Diesing, 1861. 



Specific diagnosis. — Spiruridae (?) (p. 190) : Filiform body attenu- 

 ated anteriorly and posteriorly but increasing slightly in diameter 

 in the vicinity of the mouth. Mouth elliptical, with two small coni- 

 cal unarmed lips. 



Male unknown. 



Female 42 mm. long and 500 ^ thick. Posterior extremity curved, 

 ■with a mucronate tip. 



Hosts. — Dasyprocta aguti {Dasyprocta agouti) ^Myoproctaacouchy 

 {Cavia acushy). 



Location. — Abdominal cavity. 



Locality. — Brazil. 



As in the case of Filaria bifida., this species has been placed by 

 Diesing (1861) in his genus Dicheilonema., but that genus has not 

 been held to apply in this case for the reasons given in discussing the 

 foregoing species. The incomplete description does not permit of 

 placing the species in any other genus. 



SPIROPTERA HYSTRICHIS (Rudolphi, 1809) Rudolph:, 1819, 



Synonym. — Strongylus hystrichis Kudolphi, 1809. 



SpecifiG diagnosis. — None. 



Host. — Hystrix cristata. 



Location. — In nodules in the esophagus. 



Locality. — Italy. 



The finding of this worm was recorded by Redi (1708). The 

 name given by Rudolphi is entirely unaccompanied by descriptive 

 data and is a nomen nudum. There is no evident reason why the 



