. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 107. Fig. 9.—Agapetus illini similar to it in color and general struc- ture; middle tibia and basi-tarsus com- pressed. Filth, sixth and seventh stern- ites with a crescentic ridge running from the baso-lateral corner through the meso-apical region. Sixth sternite with a definite mesal projection at apex. Genitalia consists of a simple type of sclerotized tube with the apical seg- ments invaginated. Holytype, male.—Herod, Illinois: May 1, 19,^6, Ross cV- Mohr. Allotype, female.—Same data as tor holo- type. Par
. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 107. Fig. 9.—Agapetus illini similar to it in color and general struc- ture; middle tibia and basi-tarsus com- pressed. Filth, sixth and seventh stern- ites with a crescentic ridge running from the baso-lateral corner through the meso-apical region. Sixth sternite with a definite mesal projection at apex. Genitalia consists of a simple type of sclerotized tube with the apical seg- ments invaginated. Holytype, male.—Herod, Illinois: May 1, 19,^6, Ross cV- Mohr. Allotype, female.—Same data as tor holo- type. Paratypes.—Illinois.—Eichorn: May 11, 1935, C. O. Mohr, 4cf. Herod: Same data as for holotvpe, 24 d'; May 29, 1928, along Gibbons Creek, T. H. Prison, llcT; May 10, 1935, C. O. Mohr, 11 cf, 19: May 29, 1935, Ross & Mohr, 11 cf, 79; July 11, 1935, Ross & DeLong, 1 cT; May 12, 1936, Mohr & Burks, 7cr, 39; May 13, 1937, Prison & Ross, 70cf, 7?. Agapetus medicus new species Another species indistinguishable from the miniitus group on the basis of general characteristics but radically different on the basis of genitalia, having the claspers long and truncate and the tenth tergite also long and truncate but lacking the apical dentation of minntiis and illini. Male.—Length 5 mm. Color and general structure as given for illini. .'Abdomen and genitalia as in fig. 10. Tenth tergite bilobed from base, each lateral lobe long and deep but narrow; truncate at the apex and bladelike, the ventral and apical margins without serrations or teeth, the upper margins concave and joined by membranous folds. Cerci slender and slightly sinuate; the apex narrowly rounded and the dor- sal half bearing a cluster of long, slender setae; the appendage attaining half the length of the lobes of the tenth tergite. Claspers, seen from the side, rectangu- lar, four times as long as high, the apex truncate except for a slight production near ventral margin and having a sclerotized ridge r
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