JUNE 19, 1923 COBB: NOTES ON PARATYLENCHUS 257 
Habitat: Found in soil about the roots of grasses, Devil’s Lake, North 
Dakota, April, 1915; and Four Mile Run, Falls Church, Va., August, 1922. 
Flemming’s solution to glycerine jelly. In many respects this species closely 
resembles T'ylenchus macrophallus de Man, but differs in the following particu- 
lars;—the spear is somewhat longer and possibly somewhat more robust; the 
striation is coarser; the body is wider; the tail of nanus compasses twenty 
annules while that of macrophallus appears to compass about fifty ; opposite the 
spear in nanus there are about twenty-five to thirty annules, while in macro- 
phallus there appear to be about forty. Should opportunity occur it would 
perhaps be advisable to re-examine the median oesophageal region of macro- 
phallus. For the present at least it seems best, unless the undiscovered male 
of nanus should prove to be extraordinarily like the male of macrophallus, to 
regard the two species as distinct. Paratylenchus is related to the very well- 
defined genus Jota, a genus whose numerous representatives typically are 
minute, very short, very broad, coarsely annuled, rather inflexible nemas 
found in acid soils, and having the single outstretched female sexual organ 
emptying through a vulva located very close to the minute, inconspicuous anus 
and often possessing external coarse retrorse cuticular elements,—ridges, scales, 
spines, fringes, etc., according to the species. There is a number of as yet 
unpublished species of which it is not easy to make a satisfactory assign- 
ment as between Jota and Paratylenchus. The unknown males of nanus, if 
such exist, may be expected to throw more light on the generic relationships. 
P. nanus may be synonymous with P. bukowinensis Micoletzky, 1922. 
0. 2%. 31 83 93. 
4.8 5.1) 5.6 3.1 ~ 31 ”*"" arethe measurements of a living specimen 
of P. nanus under slight pressure and therefore a little flattened, and further- 
more showing a neck-length unaltered by fixation and preservation. 
2) 2. Ba eS 98.60) 
r, e F rea es 0, 28 mm 
Paratylenchus anceps n. sp. 5:3 5:3 5.3 4.6 3.6 P. anceps so 
closely resembles P. nanus that only the differences need be here noted. The 
striae are one micron apart. The optical expression of the wings is a pair of 
refractive parallel lines whose distance apart is about equal to the width of 
two annules of the cuticle. The conoid neck becomes convex-conoid at the 
head, at the front of which the lip region is about four microns wide. ‘The spear 
guide is six microns long, and the spear about half as long as the neck, the 
long slender anterior part comprising three-fourths or four-fifths of the whole. 
The three-lobed, flattish basal bulb of the spear is about one-fourth as wide as 
the corresponding portion of the neck, that is about four microns wide. The 
somewhat elongated-pyriform or pineapple-shaped posterior bulb is three- 
fifths as wide as the base of the neck. The deirids are near the base of the 
neck. The tail is slightly conoid to the broad, rounded terminus, which is 
half as wide as the base of the tail. The vulva was about to appear at the 
same relative position as in P. nanus. In all other respects almost precisely 
as in P. nanus. 
Habitat: Roots of Umbellularia californica, Riverside, California, 1912. 
