. Bulletin. Natural history; Natural history. 154 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Art. 4 , 6cr, 49. Rock Springs: July 5, 1936, at light, H. H. Ross, Ud', 189. Cheumatopsyche gyra new species This species is closely related to gracilis, from which it differs in the more bulbous oedagus and the caudal ap- pendages of the tenth tergite, which. Fig. 87.—Cheumatnpsyche gyra have a sharp tooth on the dorso-lateral corner and which meet to form a much wider angle. Male.—Length 7 mm. Color dark brown with the following exceptions: Apical half of legs shading to
. Bulletin. Natural history; Natural history. 154 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Art. 4 , 6cr, 49. Rock Springs: July 5, 1936, at light, H. H. Ross, Ud', 189. Cheumatopsyche gyra new species This species is closely related to gracilis, from which it differs in the more bulbous oedagus and the caudal ap- pendages of the tenth tergite, which. Fig. 87.—Cheumatnpsyche gyra have a sharp tooth on the dorso-lateral corner and which meet to form a much wider angle. Male.—Length 7 mm. Color dark brown with the following exceptions: Apical half of legs shading to a light brown, the body and wings with a few very distinct, light spots, the spot on the anal margin near apex being very much reduced in size and no larger than any of the other spots. Antennae, unlike aphanta, uniformly brown with only a slight indication of the dorsal V mark on the basal segments of the flagellum. General structure as for genus. Genitalia as in fig. 87. Tenth tergite almost twice as long as deep, with a lateral tuberculate hump bearing several long, slender setae; apex divided into a pair of lateral plates almost touching dorsally and forming a wide angle. Viewed from the caudal aspect, these plates have both inner and outer mar- gins slightly sinuate, the lateral margin produced dorsally into a sharp, angular projection so that the dorsal margin of the process is concave. These plates bear scattered setae; a slight concen- tration of setae is found on the dorso- mesal portion. Claspers with basal segment slightly more than three times length of apical segment; apex slightly enlarged, clothed with scattered setae and having the usual cluster of long setae on the lateral side at apex; apical segment with the lateral margin evenly concave, the mesal margin sinuate, which results in the base being wide and tapering to a narrow constriction, above which the remainder of the segment widens very slightly. The entire seg- ment is sparsely studded with minute se
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