NO. 2012. A NEW NEMATODE FROM THE COYOTE— HALL. 75 



I have followed Railliet and Henry (1910) in grouping the two 

 subfamilies just given under the Metastrongylidse, the family created 

 by them for these subfamilies on the ground that they have the same 

 musculature. It should be noted, however, that Schneider (1866) 

 puts Pseudalius in the Holomyaria, wliich are related to the Mero- 

 myaria, and Railliet (1895) has listed Pseudalius as a meromyarian 

 of holomyarian form. Not being in a position to pass on the question, 

 I have followed Railliet and Hemy. 



Subfamily RICTXJLARIIN-^: Hall. 1913 



Subfamily diagnosis. — Metastrongylidge: Bursa much reduced or 

 lacking; when present, with few and atypical rays. Mouth with well 

 developed buccal capsule. Promment cuticular ornamentation 

 along entire body. Ovoviviparous. Parasites of the digestive tract. 



Type genus. — Rictularia Frolich, 1802. 



This subfamily is proposed here for the reason that Rictularia can 

 not be referred to any subfamily at present established. The structure 

 of the mouth parts, the esophagus, the spicules and the ovaries relates 

 it to the strongyles, although it does not have the normal strongyle 

 bursa. The elaborate cuticular ornamentation and the fact that it 

 is ovoviviparous are atypical conditions in the group to which it is 

 referred. On the other hand, the buccal capsule which relates 

 Rictularia to the Strongyloidea excludes it from any other group. 



Genus RICTULARIA Frolich, 1802. 



Generic diagnosis. — Rictulariinse. There is a well-developed, nar- 

 row, chitinous buccal capsule, with its aperture more or less distinctly 

 dorsal and probably always surrounded by a circlet of denticles, and 

 with its base armed with teeth and spmes. Esophagus without 

 posterior bulb. Along practically the enthe ventral surface on each 

 side there are two rows of cuticular combs or spines. The vulva is 

 near the posterior end of the esophagus. Male with or without a 

 bursa, which when present is always small and always remains open, 

 and with two small, equal or unequal spicules. Egg containing an 

 embryo when laid. In the small mtestine of bats, rodents, insecti- 

 vores, and carnivores. 



Type species. — Rictularia cristata Frolich, 1802. 



The above generic diagnosis is a modification of that given by 

 Jagerskiold (1909) in his monographic paper on this genus. As 

 Jagerskiold points out, the description and figures of the type-species, 

 R. cristata, do not agree with the generic diagnosis here given, in 

 that R. cristata is described and figured by Frolich (1802), and the 

 description confirmed by Dujardin (1845), as having only one row 

 of ventral combs or spines. Jagerskiold states that he would doubt 

 Frolich's accuracy if Dujardin had not verified this description, and 



