. Bulletin. Natural history; Natural history. 270 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 From other species with the ventral keel, such as attrrima, this new species may be distinguished readily by the situation of the ventral keel immediately under the face of the clasper and also by the heavily sclero- tized, serrate, lateral process of the tenth tergite. Male.—Length 6 mm. Color very dark brown, the legs whitish yellow except for the tarsi and spurs, which are brown; wings. Fig. 911.—Chimarra elia, male genitalia. without perceptible pattern; in life the in- sect looks alm
. Bulletin. Natural history; Natural history. 270 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 From other species with the ventral keel, such as attrrima, this new species may be distinguished readily by the situation of the ventral keel immediately under the face of the clasper and also by the heavily sclero- tized, serrate, lateral process of the tenth tergite. Male.—Length 6 mm. Color very dark brown, the legs whitish yellow except for the tarsi and spurs, which are brown; wings. Fig. 911.—Chimarra elia, male genitalia. without perceptible pattern; in life the in- sect looks almost black. General structure typical for genus. Male genitalia as in fig. 911. Ninth and tenth tergites fused, the anterior margin of the ninth with a short, stout, somewhat hook-shaped apodeme, the tenth tergite forming an irregular, almost membranous hood over the apex of aedea- gus; ventrad of this hood are situated the small, round cerci and, beyond these, the lat- eral margin of the segment is produced into a sharp, minutely serrate point. Ninth sternite triangular, the apico-mesal line bearing a long, projecting, sharp keel which is slightly serrulate, is situated directly be- low the base of the claspers and occupies most of the exposed ventral margin of the sternite. Claspers somewhat triangular, the dorsal corner rounded and bearing sev- eral fairly long setae, the remainder of the clasper with shorter setae, the dorsal sur- face of the apico-mesal corner with a slender but strong black spine. Aedeagus typical in general proportions for the ater- rima group, having the somewhat expanded internal base, beyond which it is cylindrical, the exserted apex membranous and narrow, not sclerotized. Holotype, male.—Spring-fed stream west of Brackettville, Texas: April 17, 1939, H. H. & J. A. Ross. Chimarra florida new species This species is a close relative of obscura, differing from it, however, in the short mesal process of the ninth sternite, the longer claspers, w
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