. Bulletin. Natural history; Natural history. 106 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Art. 4 beyond the dorsal lobe; the entire lateral face sunken except for the dorsal, basal and ventral margins. Tenth tergite fitting beneath meso-dorsal pro- jection of ninth; it is a relatively small, padlike area, appearing somewhat heart- shaped when viewed from above and as a plate when seen from the side. Oeda- gus has apical portion composed of two main parts: (1) a pair of slender lateral appendages set with small setae at apex and (2) a mesal sclerotized process which bears approximatel


. Bulletin. Natural history; Natural history. 106 ILLINOIS NATURAL HISTORY SURVEY BULLETIN Vol. 21, Art. 4 beyond the dorsal lobe; the entire lateral face sunken except for the dorsal, basal and ventral margins. Tenth tergite fitting beneath meso-dorsal pro- jection of ninth; it is a relatively small, padlike area, appearing somewhat heart- shaped when viewed from above and as a plate when seen from the side. Oeda- gus has apical portion composed of two main parts: (1) a pair of slender lateral appendages set with small setae at apex and (2) a mesal sclerotized process which bears approximately the same parts as illustrated for fenestra but which have become so completely fused that they appear as a single structure. Holotype, male.—Mount Baker, Washing- ton: July 21, 1936, along Razorhone Creek, H. H. Ross. Agapetus artesus new species Practically identical with minutus and ////;// in size and general characteristics, this species differs in the short tenth tergite, particularly the vasiform side. Fig. 8.—Agapetus artesus pieces or lateral pieces which have no spines on their distal margin. Male.—Length 5 mm. Color identi- cal with illini (see below), the body brown and the legs a lighter shade. General characteristics, such as spurs, antennae, ocelli and wings, typical of genus. The abdomen has the usual ovate organ on the fifth sternite and the long tapering process on the sixth. Genitalia as in fig. 8. Claspers short and deep; seen from the ventral aspect they appear to have a wide base and abruptly narrowed apex, the apical half having a pair of dark, sclerotized points, the larger on the ventral margin, the smaller near the dorsal margin, the two connected by a sclerotized ridge. Tenth tergite composed of two vasi- form lateral plates markedly narrowed and pointed at apex, connected by mem- branous folds. Cerci narrow at base, broader and almost truncate at apex; slightly more than one-third the length of the claspers, pointed latero-caudad and with a cl


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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory