NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



175 



spines attain a maximum length of about 75 [i from the anterior 



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



transverse cuticular striations are 5 to 11 /^ wide over most of the 



body, but on the outside of a curve they 



may be extended to 30 fx. or more. The 



eggs are about 38 by 22 /x in diameter 



and contain a well-developed embryo 



when oviposited. There are two chiti- 



nous cutting plates borne on the ba.se 



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 are not. 



Host. — Eutamias quadrivlttatus. 



Location,. — Small intestine (male) 

 and stomach (female). 



Antekior extremity of female. 

 n. r., Nerve ring. 



'Homin. 



Locality.— V-Agos-A Springs, Colo- ^ig. 22.s.-KicTULARrA coloradensis. 

 rado. 



Type-s-pecimcns. — No. 165G9, 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. E. Warren, of Colorado 



Springs, who turned over to me 

 the host material, preserved in 

 alcohol, from which the worms 

 were collected. 



RICTULARIOIDES Hall, 

 1916, new genus. 



FIG. 229.-RicTtJLARioiDEs AMPiuACANTiiuM. S unowi m.—Rictulavia Froelich, 



IIe ad OF FEMALE, a, Lateral view; 6, VIEW i at r i /O 7 • 



FROM TUE FRONT. ENLARGED. AFTER DiES- 1802, of aUtllOrS, part) OflllOStO- 



^^^' is^^- mum Creplin, 1839, part. 



Generic diagnosis. — Eictulariinae (p. 168) : Head v,'itli four pro- 

 jecting apices united by chitinous membranes to form two equal lips 

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

 hooks along the body. Male unknown. 



Type-sfecies. — RictulaHoides ampMacanthum (Diesing, 1851) 

 Hall, 1916. 



RICTULARIOIDES AMPHIACANTHUM (Diesing, 1851) Hall, 1916. 



Synonyms. — Ophiostomjiim annphiacanthum Diesing, 1851; Rictu- 

 laria anfiphiacanthum (Diesing, 1851) von Drasche, 1882. 

 Specific diagnosis. — Rictularioides (p. 175) : 



