148 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Hydroptila vala Ross 



Hydroptila vala Ross (1938^, p. 123); c?, 9. 



Larva. — Unknown. 



Adults. — In size and color similar to 

 armata. Seventh sternite of male with a 

 long, straight process. Male genitalia, fig. 

 515: tenth tergite divided into a pair of 

 thick, rectangular lobes; beneath these arise 

 a pair of long arms which curve back over 

 the tergite ; claspers with apical portion long 

 and flattened, curved slightly mesad at tip; 

 aedeagus with apical portion long, simple 

 and sharply turned at tip, and with a long 

 spiral. Female genitalia, fig. 530: eighth 

 segment semimembranous; sternite with a 

 central Y- or T-shaped structure without 

 imbrications, and with an apical, detached 

 plate bearing six long setae. 



Originally described from Herod, Illinois, 

 the species has since been collected at another 

 locality near Herod and in the Kiamichi 

 Mountains of Oklahoma. 



Illinois Records. — Eddyville, Lusk 

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

 $ $ . Herod: May 29, 1935, Ross & Mohr, 

 $ $, ? 5. 



Hydroptila xella Ross 



Hydroptila xella Ross (1941^, p. 65); cf, 9. 



Not yet taken in the state but perhaps to 

 be expected in future collecting. The species 

 is known only from south central Tennessee, 

 where it occurred along a creek similar to 

 several found in southern Illinois. Both 

 sexes are readily identified by means of the 

 genitalia; the larvae are unknown. 



Hydroptila spatulata Morton 

 Hydroptila spatulata Morton (1905, p. 66); 



Larva. — Fig. 504. Head and body scle- 

 rites tawny yellow, head and pronotum with 

 a scattering of small, dark spots. 



Adults. — Size and color as for armata. 

 Seventh sternite of male with a long, straight 

 process, oblique at apex. Male genitalia, 

 fig. 514: tenth tergite membranous, with 

 a pair of sinuate, sclerotized rods running 

 through it; beneath tenth tergite arise a 

 pair of recurved, membranous processes, fre- 

 quently difficult to see due to poor refrac- 

 tion; claspers spatulate; aedeagus very long 



and slender, spiral small, tip provided with 

 a lateral spur and beyond this spur a knob. 

 Female genitalia without ventral ornament 

 on eighth sternite, the apical setae of this 

 sternite grouped on a semicircular lobe as 

 in fig. 531. 



Allotype, female. — Kankakee, Illinois: 

 June 6, 1935, Ross & Mohr. 



Our only abundant records in Illinois are 

 along the Kankakee River. Here the larvae 

 occur in the rapids, where we have collected 

 mature pupae. Other records are from the 

 Oakwood region. Adult records extend from 

 June to late in August, indicating successive 

 summer generations. 



The range of the species extends through- 

 out the Northeast; definite records are 

 available for Illinois, Indiana, Michigan, 

 New York, Quebec, Wisconsin. 



Illinois Records. — Danville, Middle 

 Fork River: Aug. 27, 1936, Ross & Burks, 

 3 larvae. Kankakee: Kankakee River, 

 Aug. 1, 1933, Ross & Mohr, 4,^ , 1 ? , many 

 larvae, 2 pupae; June 6, 1935, Ross & Mohr, 

 $ S ,69. MoMENCE : July 14, 1936, B. D. 

 Burks, 1 larva; strip mines, Aug. 21, 1936, 

 Ross & Burks, $ S , many larvae and pupae; 

 Kankakee River, Aug. 24, 1936, Ross & 

 Burks, 4 5 ; May 17, 1937, Ross & Burks, 

 many larvae; Kankakee River, May 24, 

 1937, H. H. Ross, S S ; at light, June 24, 

 1939, Burks & Ayars, 1^. Morris: Aug. 

 22, 1938, H. H. Ross, S S, 2 9 . Oak- 

 wood: Salt Fork River, July 18, 1933, Ross 

 & Mohr, 2 5,39; Middle Fork, Vermilion 

 River, July 18, 1933, Ross & Mohr, 1 S ; 

 May 21, 1936, Mohr & Burks, 1$. Put- 

 nam, Lake Senachwine: July 11, 1933, C. 

 O. Mohr, 45 . Wilmington: July 1, 1934, 

 DeLong & Ross, 4 S ; Aug. 20, 1934, De- 

 Long & Ross, 45, 16 2 ; Kankakee River, 

 May 27, 1935, Ross & Mohr, 15, many 

 larvae and pupae; Kankakee River, June 6, 

 1935, Ross & Mohr, 5 5 ; July 1, 1935, 

 DeLong & Ross, 5 5 . 



Hydroptila virgata Ross 



Hydroptila virgata Ross (1938a, p. 125); c?, 

 9. 



Larva. — Unknown. 



Adults. — Size and color as for armata. 

 Seventh sternite of male with mesal process 

 sinuate and abruptly narrowed at tip. 

 Eighth sternite of male with apico-mesal 

 portion forming a heavily "sclerotized, rud- 

 der-like projection. Male genitalia, fig. 511: 



