1V2 



PROCEEDINdS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Fig. 222.— Rictularu. fallax. Posterior 

 extremity of female. x 28. after 

 JagerskiOld, 1909. 



The first and largest spine is 

 about 150 ju, long. 



Host. — Sciurus melanogaster. 



Looation. — Intestine. 



Locality. — Mentawei, south of 

 Sumatra. 



This species, regarded by 

 Parona (1898) as identical with 

 Rictularia flagiostoma.^ has been 

 examined by Jiigerskiold (1909) 

 who finds it to be a new species. 

 He gives a comparative study of 

 R. fallax and R. plaglostoma. 

 He states that the structure of 

 the buccal capsule was not deter- 

 mined owing to the condition of 

 material. Also he notes that the 

 measurement for the nerve ring, 

 given above, may be wrong 

 owing to the opacity of the mate- 

 rial and the dilliculty of locating 

 the nerve ring. 



of cuticular markings con- 

 tains 50 combs and about 34 

 spines. The forty-second 

 comb lies just anterior of the 

 vulva. Posterior of the vulva 

 are eight combs, followed by 

 the sharper, narrower spines. 

 The highest combs, from the 

 sixteenth to the twenty-fourth 

 pair, are about 110 ix high and 

 110 /A long. The combs lying 

 nearest the vulva are longer, 

 150 II long, but are not so 

 liigh, being only 50 ix high. 



Fig. 223.— Rictularia fallax. Anterior ex- 

 tremity OF female, lateral view. X 28. 

 After Jagerskiold, 1909. 



