112 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Fig. 222.— Rictularia fallax. Posterior 

 extremity of female. x 2s. after 

 Jagerskiold, 1909. 



The first and largest spine is 

 about 150 [i long. 



Host. — Sclurus melanogaster. 



Looatlon. — Intestine. 



Localit]]. — Mentawei, south of 

 Sumatra. 



This species, regarded by 

 Parona (1898) as identical with 

 Rictularia flagiostoma^ has been 

 examined by Jagerskiold (1909) 

 who finds it to be a new species. 

 He gives a comparative study of 

 R. fallow and R. 'plagiostoma. 

 He states that the structure of 

 the buccal capsule was not deter- 

 mined owing to the condition of 

 material. Also he notes that tlie 

 measurement for the nerve ring, 

 given above, may be wrong 

 owing to the opacity of the mate- 

 rial and the difficulty 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 /a high and 

 110 jLi long. The combs lying 

 nearest the vulva are longer, 

 150 ju, long, but are not so 

 high, being only 50 /a high. 



Fig. 223.— Rictularia fallax. Anterior ex- 

 tremity OF FEMALE, LATERAL VIEW. X 28. 



After JagerskiOld, 1909. 



