L = 0.34;
There is only a single wing bordered by two faint, slightly crenate
lines. The six cephalic probolae arch inward over the pharynx and
are serrate, cutinized and highly refractive. The serrate elements
are six in number on each probola. The labial pobolae are slender
and lean outward. They are bifurcate about one-fourth their length,
the prongs being short and slender. All the pharyngeal plates are
small, the three posterior sets being about as wide as long. When
viewed from the face the second set is seen to bear two minute denticles
on each plate, grouped about the entrance to the closed portion of the
pharynx. The cardiac bulb is three-fifths the width of the neck.
The intestine soon increases from one-third to two-thirds the body-width,
its cells containing a few scattered, dark granules. The vulva is
small and slightly depressed. An egg is one-eighth the body-length.
The conoid tail is similar to that figured for serratus. Male
unknown.
From mountain soil, Utah and Colorado. Very
rare, seldom more than one or two specimens in a collection where other
species are numbered by dozens.
(Description- Thorne, 1925)
