150 



Illinois Natural History Survey Bulletin 



Fol. 23, Art. 1 



16, 1936, Ross & Mohr, 45, 1$. Dan- 

 ville, Middle Fork River: Aug. 27, 1936, 

 Ross & Burks, 2 larvae. Eddyville, Lusk 

 Creek: June 19-20, 1940, Mohr & Riegel, 



5 (J , 59, 1 pupa. Elizabethtown : June 

 25, 1932, Ross, Dozier & Park, 1 $ . Fox 

 Lake: June 30, 1935, DeLong & Ross, 

 19. Harrisburg: June 15, 1934, DeLong 



6 Ross, at light, 1(5. Herod: June 20, 

 1940, Mohr & Riegel, 1^. Homer: Aug. 

 5, 1931, H. H. Ross, 1 $ . Momence: Aug. 

 21, 1936, Ross & Burks, 1 <? . Ottawa: 

 July 3, 1937, at light, Werner, 1 S . 



Hydroptila amoena Ross 



Hydroptila amoena Ross (1938a, p. 124); cf . 



Larva. — Unknown. 



Adults. — Size and color as for armata. 

 Seventh sternite of male with a long mesal 

 process which is curved ventrad and slightly 

 indented at apex, the apical margin slightly 

 rounded and neither flanged nor serrate. 

 Invaginated lateral portion of ninth seg- 

 ment long and narrow. Male genitalia, fig. 

 513: tenth tergite narrow and projecting; 

 claspers short, with a wide base and narrow 

 apex, slightly beaked at tip; aedeagus with 

 very short spiral wound tightly around the 

 short neck, the apical portion long and 

 divided almost to base to form long proc- 

 esses. Female genitalia, fig. 528: eighth 

 sternite tapering and semimembranous, with 

 a pair of ovate lobes at apex, each bearing 

 three long setae. 



Allotype, female. — Broken Bow, Okla- 

 homa, along small creek near town: June 

 8, 1940, Mrs. Roy Weddle. 



Our only records for this species are col- 

 lections of males from Herod, Illinois, and 

 Turner Falls State Park, Oklahoma (the 

 type series) and a subsequent collection of 

 both sexes from Broken Bow, Oklahoma. 

 Presumably this species is a spring form 

 inhabiting small streams in the Ozarks and 

 neighboring ranges. 



Illinois Records. — Herod: May 29, 1935 

 Ross & Mohr, 1 $ ; Gibbons Creek, April 

 19, 1937, Ross & Mohr, 1 $ . 



Hydroptila waubesiana Betten 



Hydroptila waubesiana Betten (1934, p. 160); 

 cf, 9. 



Larva. — Figs. 509, 541. Color extremely 

 variable. Light extreme has head and tho- 



Fig. 541. — Hydroptila waubesiana larva. 

 Dorsal aspect, left; lateral aspect, right. 



racic terga yellow with small black marks 

 as in fig. 5Q9A ; dark extreme has head most- 

 ly black with thoracic terga having large 

 dark areas. 



Adults. — Size and color as for armata. 

 Male genitalia, fig. 517: ninth segment al- 

 most entirely retracted within eighth; tenth 

 tergite divided into a pair of long processes, 

 closely appressed and with apexes pointed 

 laterad, truncate and sclerotized; claspers 

 long, slender and hooked at apex, reaching 

 beyond apex of tenth tergite ; aedeagus 

 simple, rodlike. Female genitalia, fig. 533: 

 eighth segment sclerotized, the ventral por- 

 tion produced into a long, tonguelike flap 

 which is emarginate at tip, tergite deeply 

 incised on meson. 



Interesting among the habits of this spe- 

 cies is its ability to thrive in both lakes and 

 streams. In Illinois it occurs over the entire 



