NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



171 



Fig. 21S. — Rictulakl\ 

 ELViR.YE. Anterior 

 extremity of female. 

 Enlarged. After 

 Parona, 1SS9. 



Fig. 219.— Rictulakia elvi- 

 RAE. Anterior extremity, 

 showing mouth aperture. 

 Enlarged. After P.^rona, 

 1889. 



tail terminates in a simple tip. There are the usual two series of 

 cuticular spines extending from the head end to the anus. In the 

 cervical region is a first series of 19 little spines 

 (fig. 220). These spines are very small at first, 

 then a little larger, and then small again. A sec- 

 ond series of 32 pairs, spaced at distinct intervals, 

 follows this after a short interval in which there 

 ai'e no spines; these in- 

 crease in size posteriorly 

 from the first, which is 

 14 fi long, to the last pair. 

 The twenty-fifth, which 

 is one of the largest, 

 is 18 /x long; the dis- 

 tance between them in- 

 creases gradually from 

 the first to the last ; there 

 is a space of 1 mm. from 

 the t w e n t j~i i r s t and 

 twentj^-second pair, "and 

 a space of 2 mm. from the twenty-ninth to the thirtieth ; the last pair 

 is 8.5 mm. from the tip of the tail. The eggs are 56 by 28 [x in diam- 

 eter and contain embrj^os when oviposited (fig. 221). 

 Host. — Dremomys rujigenh {Sclurus ruflgenis). 

 Location. — Intestine. 



Locality. — Monte Mooleyit, Monti Dana, Tenas- 

 serim. 



I do not find Parona's description entirely clear. 

 Jagerskiolcl (1909) has examined Parona's types of 

 this species and finds it a good species of unusual 

 thickness. He states that there are 

 20 combs and 32 spines. 



RICTULARIA FALLAX Jagerskiold, igog. 



Synonym. — Rlctularia plaglostonia 

 (Wedl, 18G2) Willemoes-Suhm, 1873, 

 of Parona, 1898. 



Specific diagnosis. — Rictularia (p. 

 1G8) : 

 Male unknown. 



Female 20 mm. long with a maximum thickness of 750 /x,. Esoph- 

 agus 2.960 mm. long. Nerve ring ( ?) 240 /x from the anterior end of 

 body. Anus 200 /x from posterior end of body (fig. 222), Vulva 3.41 

 mm. from the anterior end of the body, and behind the posterior end 

 of the esophagus (fig. 223). Eggs 44 by 27 \i in diameter. Each row 



Fig. 220.— Rictula- 

 ria ELViRAE. An- 

 terior extrem- 

 ity of female. 

 Enlarged After 

 Parona, 1889. 



Fig. 221.— Rictula- 

 ria ELViEAE. Egg. 

 Enlarged. After 

 Parona, 1889. 



