NO. 2131. NEMATODE PARAmTES OF RODENTS—HALL. 123 



with the word Nematoideurrh. He does not use the form Nematoi- 

 deum Tnuris-amphihii, credited to him by Diesiiig. 



The species found by Redi may have been hirval strongyles or they 

 may have belonged in some other superfamily. It is hardly worth 

 while speculating on the subject. 



Family TRICHOSTRONGYLIDAE Railliet, 1915. 



Synonym. — Tricostrongylidae Leiper, 1908, of Travassos, 19145. 



Fainily diagnosis. — Strong^doidea (p. 106) : Meromyarian. Simple 

 mouth without a buccal capsule. Parasitic only in the digestive sys- 

 tem. Development direct and simple, involving in all cases known 

 only the possibility of infection by ingestion. 



Tyj^e-genus. — T ricKostrong ylus Looss, 1905. 



ANALYTICAL KEY TO SUBFAMILIES OF TRICHOSTRONGYLIDAE. 



1. Body uot spii'ally curled. Females with 2 ovaries Trichostrougylinae, p. 123. 



Body frequently spirally curled. Females with 1 ovary. 



Heligmosominae, p. 14S. 



Subfaixiily TRICPIOSTRO^STG'irJL.Ilsru^E; Leiper, 1908. 



Subfamily diagnosis. — Trichostrongyliclae (p. 123) : Body straight 

 or curved, but not regularly coiled in a spiral. Females with two 

 ovaries. 



Type-genus. — T ricJiostrongylus Looss, 1905. 



ANALYTICAL KEY TO GENERA OF TRICHOSTRONGYLINAE. 



1. Insufficiently described Genus uncertain, p. 144. 



Recognizable genei'a 2. 



2. Bursa with 2 distinct dorsal rays, each supporting a small dorsal lobe; 



ventro-ventral and latero-veutral rays close together and parallel ; medio- 

 lateral and postero-lateral close together and parallel_A^<?7«oYo(/ir7<.s, p. 131. 

 Bursa with 1 dorsal ray, commonly branched ; ventro-ventral and latero- 

 ventral rays, and medio-lateral and postero-lateral rays not close together 

 and not parallel 3. 



3. Spicules short, spatulate, and appearing as though twisted. 



Tricliostrongylus, p. 124. 

 Spicules long and filiform, straight or curved 4. 



4. Spicules cleft along almost entire length ; ventro-ventral, latero-ventral, and 



postero-lateral rays originate in a common trunk CitcUin€nia,ixl-il. 



Spicules simple or only cleft at tips ; ventro-ventral, latero-ventral, and 

 postero-lateral rays do not originate in a common trunk 5. 



5. Mouth surrounded by a chitinous ring ; cuticle with numerous prominent 



longitudinal rid^'es ; bursa faintly incised dorsally ; postero-lateral and 

 medio-lateral rays do not originate in a common trunli-Graphtdium, p. 139. 

 Mouth not surrounded by a chitinous ring; cuticle without prominent longi- 

 tudinal ridges ; bursa deeply incised dorsally ; postero-lateral and medio- 

 lateral rays originate in a common trunk Warrenius, p. 142. 



