. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 175 and Olemira, are set apart as genera only on secondary sexual characters. A de- tailed study of the genitalia shows that, in many cases, past divisions have cut across phylogenetic lines. It seems ad- visable at the present time to group the species of this complex under the one genus Lepidosto7na. There is no doubt but that a great deal of investigation will be needed to establish even a semi- permanent generic organization ot the subfamily, and it seems to me that until this takes recognition of the fema
. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 175 and Olemira, are set apart as genera only on secondary sexual characters. A de- tailed study of the genitalia shows that, in many cases, past divisions have cut across phylogenetic lines. It seems ad- visable at the present time to group the species of this complex under the one genus Lepidosto7na. There is no doubt but that a great deal of investigation will be needed to establish even a semi- permanent generic organization ot the subfamily, and it seems to me that until this takes recognition of the females it will not be at all satisfactory. Lepidostoma knowltoni new species This species is closest to the togatum group but differs in the combination of unreflexed costa in the front wing with a very twisted and abnormal first an- tennal segment, fig. 117. Male.—Length 10 mm. Body light brown with the eyes, first antennal seg- ment and dorsum of thorax darker brown. General structure: Basal antennal segments contorted, excavated and twisted as in fig. 117, bearing at the base a short dorsal process pointed dorso- mesad, beyond this another similar one on the mesal margin pointing mesad and between these on the ventral margin another process which is pointed and contmues as a thick brush of stout setae, the entire structure curving meso- dorsad and ending on a level with the dorsal margin of the segment. Beyond this the segment is dorso-ventraily com-. cf Tercites Fig. 117.—Lepidostoma knowltoni pressed, then widened again at apex. Maxillary palpi with a stout brush of scales issuing from the apex; in both specimens examined this brush is opened up to form an almost globular mass which hides the structure of the palpus. Legs and wings normal for genus. Both wings with a sparse scattering of scales over most of the wing but without the costal margin reflexed. Genitalia as in fig. 117. Ninth tergite produced caudad on meson, merging imperceptibly with the tenth tergite. Tenth
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
