. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinois 201 sternite produced as a broadly rounded lobe, without median emargination or excavation; caudal filaments faintly tan stained on basal articulations. Known from Illinois and Iowa. Illinois Records. — Mount Carmel: Wabash River, June 10, 1947, Burks & Sanderson, 1 $ . Oregon : Rock River, July 9, 1925, T. H. Prison, \S , 12. Rock Is- land: 10<5, 9 9 (Walsh 1863:204). Rec- ords of supposed nymph: Dixon: Rock River, May 22, 1925, D. H. Thompson, 1 N. Mount Carmel: Wabash River, May 25, 1942, Mohr cSc
. Bulletin. Natural history; Natural history. May, 1953 Burks: The Mayflies of Illinois 201 sternite produced as a broadly rounded lobe, without median emargination or excavation; caudal filaments faintly tan stained on basal articulations. Known from Illinois and Iowa. Illinois Records. — Mount Carmel: Wabash River, June 10, 1947, Burks & Sanderson, 1 $ . Oregon : Rock River, July 9, 1925, T. H. Prison, \S , 12. Rock Is- land: 10<5, 9 9 (Walsh 1863:204). Rec- ords of supposed nymph: Dixon: Rock River, May 22, 1925, D. H. Thompson, 1 N. Mount Carmel: Wabash River, May 25, 1942, Mohr cSc Burks, 1 N; May 28, 1942, Mohr & Burks, 1 N. 48. ARTHROPLEA Bengtsson Artliroplea Bengtsson (1908:239). Remipalpus Bengtsson (1908:242). HaploTiia Blair (1929:254). In the adult males of Artliroplea, the compound eyes are almost contiguous on the meson; the first fore tarsal segment is two- thirds as long as the second segment, and the entire tarsus is twice as long as the fore tibia. In both sexes, the venation of the fore wing is typical for the family, with the basal crossveins in the costal interspace rather weak and the stigmatic costal crossveins well developed but relatively few in number and not anastomosed. The hind wing, fig. 321, has the vein R4+5 unbranched throughout its length. The male genitalia, fig. 393, consist of a pair of five-segmented forceps and a pair of semirectangular penis lobes; each lobe bears three long, filamentous ap- pendages. In the females, the apical abdom- inal sternite has the posterior margin evenly rounded from side to side, not indented on the meson. The nymphs, fig. 395, are unique among American mayflies in that the labial and maxillary palps are considerably lengthened. Each maxillary palp has two segments and is as long as the head and thorax combined ; each labial palp has two segments and is one-half as long as the maxillary palp. Nor- mally, the maxillary palps are held extended posteriorly, over the thoracic notum, but the
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