NO. 2131. 



NEMATODE PARASITEf^ OF RODENT!?— HALL. 



175 



% 



spines attain a maximum length of about 75 ix from the anterior 



portion of the base to the end of the posteriorly directed tip. The 



transverse ciiticiilar striations are 5 to 11 ;«, wide over most of the 



body, but on the outside of a curve they 



may be extended to 30 [x or more. The 



eggs are about 38 by 22 fi in diameter 



and contain a well-developed embryo 



when oviposited. There are two chiti- 



nous cutting plates borne on the base 



of the buccal capsule and situated one 



on each side of the esophageal opening 



(fig. 228) . The lateral and dorsal head 



papillae are visible in the available 



specimen, but the ventral arc not. 



Host. — Eutamias qtiadrimttatus. 



Location. — Small intestine (male) 

 and stomach (female). 



Locality. — Pagosa Springs, Colo- 

 rado. 



Type-speciTnens. — No. 1G5G9, U. S. 

 N. M. (Bureau of Animal Industry helminthological collection). 



I am indebted for this material, as for other material acknowl- 

 edged elsewhere, to the courtesy of Mr. E. II. Warren, of Colorado 



Springs, who turned over to me 

 the host material, preserved in 

 alcohol, from which the worms 

 were collected. 



RICTULARIOIDES Hall, 

 1916, ne^Ar genus. 



FIG. 229.-rictx;lakioides AMPmACANTiiuM. Simon}/ rii.—Rictiilnria Froelich, 



Head OF FEMALE, a, Lateral aiew; &, view i ^^t .c i /O 7 • 



FROM THE FRONT. ENLARGED. AFTER DiES- loOw, 01 aUthOl'S, pai't 5 U p IllOStO- 



^«' 1857. ,jy^um Creplin, 1830, part. 



Generic diagnosis. — Eictnlariinae (p. 168) : Head Avith four pro- 

 jecting apices united by chitinou.s' mem1)ranes to form two equal lips 

 (fig. 229). Female with three series of simple, posteriorly directed 

 hooks along the body. Male unknown. 



Type-species. — Rictularioides amphiacanthum (Diesing, 1851) 

 Hall, 1916. 



lomm. 



Fig. 228.— Rictui.aeia coloradensis. 

 Anterior extremity of female. 

 n. r., Nerve ring. 



RICTULARIOIDES AMPHIACANTHUM (Diesing, 1851) Hall, 1916. 



Synonyms. — Ophiostoinum a.niphmcaoithum Diesing, 1851 ; Rictu- 

 lar'ia amphiacanthum (Diesing, 1851.) von Drasche, 1882. 

 Specific diagnosis. — Rictularioides (p. 175) : 



