NO. 2131 



NEMATODE PARA SITE Si OF RODENTS— HALL. 



141 



Locality. — Europe (France, Germany, Austria). 



The writer has had occasion to examine specimens of this species 

 through the courtesy of Professor Eailliet, who furnished them to 

 the United States Bureau of Animal Industry. As the 

 comparison with Dujardin's measurements suggests, it is 

 likely that the writer's measurements will be under the 

 maximum for this species as found in the largest 

 specimens. 



CITELLINEMA Hall, 1916, new genus. 



Generic diagnosis. — Trichostrongylinae (p. 123) : Head 

 surrounded by a sort of collar which forms the external 

 limit of a depression around the head anteriorly. Two 

 spicules, each bifurcating near the proximal wide tubular 

 end to form two long filiform distal processes. Ventro- 

 ventral, latero-ventral, and externo-lateral rays appar- 

 ently originate from a common stem, Avhich in turn unites 

 at its base with the common stem of the medio-lateral 



and postero-lateral rays. Nature of dor- 

 sal ray not distinguishable in the one 

 available specimen. 



This genus and other genera and spe- 

 cies following are put in the Tricho- 

 strongylinae tentatively on the chance 

 that they like most of the Trichostrongy- 

 lidae, have a female with two ovaries 

 rather than with one as in Heligmoso- 

 mum. 



Type-species. — CitellineTna hifurcatum 

 Hall, 1916. 



Fig. 184.— CI- 

 tellinema 

 bifurcatum. 

 Anterior 

 extremity 



OF MALE. X 

 382. 



CITELLINEMA BIFURCATUM Hall, 

 species. 



1916, new 



Specific diagnosis. — CitellineTna (p. 

 141 ) : Cuticle Avith pronounced longitudi- 

 nal striation. Mouth with apparently six 

 lips surrounded by a sort of collar (fig. 

 184). 



]\[ale 6.8 mm. long and 170 /x thick at 

 the base of the bursa. Head diameter 26 

 /A without the collar and 38 /* inclusive of 

 collar. Esophagus 535 ju, long by 70 ^x. 

 thick. Nerve ring 170 /a back of head. 

 The longitudinal striation of the body cuticle is continued along the 

 bursal rays (fig. 185), while the bursal membrane is transversely 



Fig. 185.— CITELLINEMA BIFURCATUM. 



Posterior extremity of male, 

 latero-ventral view. d. i., pos- 

 tero-lateral (dorso-lateral) 



KAY; e. I., EXTERNO-LATERAL RAY; 

 I. v., LATERO-VENTRAL RAY; TO. I., 

 MEDIO-LATERAL RAY; V. V., VENTBO- 

 VKNTRAL RAY. ENLARGED. 



