184 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.50. 



Location. — Not given. 

 Locality. — Port Alegre. 



The buccal cavity is the particular feature of importance in this 

 species. 



FILARIA DIACANTHA Molin, 1858&. 



Synonyms. — Filarla hystrichis-prehensilis ISI. C. V. of Molin, 

 1858&/ Filaria loncheri M. C. V. of Molin, 18585. 



Specific diagnosis. — Filarla (p. 179) : Body slightly attenuate an- 

 teriorly and ^ery much attenuate posteriorly. Posterior extremity 

 terminates in two divergent spinous processes. Mouth unarmed. 



Male 25 to 41 mm. long and 1G7 to 250 ju. thick. Posterior ex- 

 tremity coiled in a spiral. 



• Female 33 to 81 mm. long and 1G7 to 500 jx thick. Posterior ex- 

 tremity curved. 



Hosts. — Euryzygomatomys rufus {Loncheres rufa)^ Coendou pve- 

 hensilis {Cercolahes prehensilis, LLystrix prehensilis) , Euryzygoma- 

 tomys spinosiis ( IMesomys spinosus). 



Location. — Abdominal cavity and lungs. 



Locality. — Villa Maria and Caigara, Brazil. 



The structure of the posterior extremity in this species and the 

 presence of the parasite in the abdominal cavity suggests that this 

 might be a species of Setaria, but there is not sufficient evidence 

 at present to warrant the removal of the worm from the genus 

 Filaria. 



Stossich (1897) apparently makes Mesomys spinosus the equiva- 

 lent of Loncheres rufa. It appears, however, that M. spinosus is 

 the equivalent of Euryzygomatomys spinosus, not of Eu. rufus. 



FILARIA LINSTOW Hall, 1916, new name. 



Synonym,. — Filaria sciuri von Linstow, 1903, not Molin, 18585. 



Specific diagnosis. — Filaria (p. 179) : Head end rounded. Behind 

 the mouth aperture two rows of four flat papillae each. Cuticle 

 smooth. 



Male unlcnown. 



Female 28 mm. long and G50 /x thick. The shoi-t tail end is conical^ 

 with a rounded tip, which is prolonged into a small clawlike process. 

 This tail end is one one-hundred-and-fifty-sixth of the entire length 

 of the body. Eggs not developed. 



Host. — Sciurus caniceps. 



L^ocation. — Subcutaneous. 



Locality. — Aring, Kelautan, Siam. 



