. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 111 characteristics occur only in the genital apparatus. Genitalia as in fig. 15. Claspers fairly long, basal half narrow, apical half con- siderably widened, the apical margin practically truncate, seen from either the lateral or ventral aspects; the apical half clothed with long setae and having a mesal lobe abundantly provided with setae. Tenth tergite almost as deep as long; the meso-apical corner is produced into a sharp, curved point; the ventral portion ends in a very broad, curved point and within this
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. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 111 characteristics occur only in the genital apparatus. Genitalia as in fig. 15. Claspers fairly long, basal half narrow, apical half con- siderably widened, the apical margin practically truncate, seen from either the lateral or ventral aspects; the apical half clothed with long setae and having a mesal lobe abundantly provided with setae. Tenth tergite almost as deep as long; the meso-apical corner is produced into a sharp, curved point; the ventral portion ends in a very broad, curved point and within this is a flaplike lobe; the entire structure is sparsely covered with setae, those on the apical margin being very Jong. Oedagus anchored at the base by two ribbonlike, sclerotized bands which are fashioned laterally near the base ot the claspers; the apical por- tion ot the oedagus is composed of two tapering, sclerotized rods; from the cen- tral portion of the oedagus arises an erect process with its apex enlarged into a knoblike structure which is densely covered with short, straight setae. Holotype, male.—Pinedale, Wyoming: July 6, 1936, along Green River north of town, H. H. Ross. Paratypes.—Utah.—Big Cottonwood Can- yon: April 24, 1937, G. K. Knowlton & F. C. Harmston, 5 d'. Wyoming.—Same data as for holotype, 2c?'. The five paratypes from Utah differ trom the others in being uniformly darker in color, and in having the dorso- mesal point of the tenth tergite of the male reduced or absent. The extreme similarity of all other points of the genitalia leaves no doubt, however, that the two series are the same species. Paragapetus celsus new species This species is most closely related to nearcticus Banks, but differs in lacking a long, palmate dorsal process on the tenth tergite. Male.—Length 4 mm. Color, in- cluding wings, legs and other ap- pendages, uniformly blackish brown. General structure: Antennae about 24-segmented, two-thirds length of lorewing. Maxillar