. Bulletin. Natural history; Natural history. 122 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 4. Dorsal Complex Fig. 33.—Polytrichia spinosa oregona, with the following differences: Eighth segment with the dorsal fissure much wider so that the two parts of the dorsum are well separated. Dorsal assemblage of genitalia shorter, the in- dividual sclerotized rods proportionately shorter and stouter; best seen from a lateral view. Left clasper sinuate, the apex with a sclerotized spine pointing mesad, with a fairly long spine on the ventral corner and with a cluster of two black spines
. Bulletin. Natural history; Natural history. 122 ILLINOIS NATURAL HISTORY SURVEY BULLETIN \'ol. 21, Art. 4. Dorsal Complex Fig. 33.—Polytrichia spinosa oregona, with the following differences: Eighth segment with the dorsal fissure much wider so that the two parts of the dorsum are well separated. Dorsal assemblage of genitalia shorter, the in- dividual sclerotized rods proportionately shorter and stouter; best seen from a lateral view. Left clasper sinuate, the apex with a sclerotized spine pointing mesad, with a fairly long spine on the ventral corner and with a cluster of two black spines just basad of this on the mesal face; right clasper sinuate, with a small cluster of three spines on the mesal face near the ventral corner. Oedagus same as for shawnee. Holotype, male.—Turner Falls State Park, Oklahoma: June 2, 1937, along Honey Creek, H. H. Ross. Paratype.—Oklahoma.—Same data as for holot\'pe, 1 cT. Pol3rtrichia xena new species This species is distinguishable from others in the genus on the basis of the shart mesal process of the genitalia, which has no complicated armature. Male.—Length mm. Color whit- ish; areas on periphery of head, all mesonotum, metanotum except scutel- lum, upper portion of pleurae and dorsum of abdomen brown. Wings dark gray with a light transverse band just before middle; legs whitish, the front tibiae and tarsi clothed with dark setae. General structure same as in shawnee. Genitalia as in fig. 34. Genital cap- sule wide and long but shallow. Ninth segment twice as long ventrally as dor- sally, the dorsal margin cut in on meson so that the segment forms merely a narrow bridge mesally. Tenth tergite triangular, apparently fused with the other appendages of the genitalia aside from the claspers and oedagus. T^is entire process is short; the base is se'mi- sclerotized; the right side of the apex is mostly membranous and the left side covered with a sclerotized shield; a small dorsal tooth lies just below ex- treme apex; th
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