234 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Adults. — Length 10-12 mm. Color dark 

 brown with very few markings. Male geni- 

 talia similar to those of transversus, differ- 

 ing chiefly in the basal segment of the 

 claspers, which lack the ventral projection, 

 fig. 791. Considerable variation occurs in 

 both tenth tergite and claspers, as shown 

 in the two drawings. Female genitalia, fig. 

 798, also very similar to those of trans- 

 versus, usually with the mesal lobe of the 

 ninth sternite narrower and the sloping 

 portion of the tergite longer. 



This species has been collected commonly 

 in northern Illinois, and we have also one 

 or two scattered records from the central 

 and southern parts of the state. It frequents 

 medium to large streams and has an adult 

 emergence ranging from June through 

 August. We have reared the larvae from 

 Nippersink Creek. 



The species is widely distributed through 

 the eastern states and westward through 

 the Ozarks to Oklahoma. We have records 

 from Arkansas, Georgia, Illinois, Indiana, 

 Kentucky, Minnesota, Missouri, New York, 

 Ohio, Oklahoma, Pennsylvania, Quebec, 

 Tennessee and Wisconsin. 



Illinois Records. — Many males and fe- 

 males, taken May 17 to August 2, and many 

 larvae, taken May 17 to June 9, are from 

 Dixon, Elgin (Botanical Gardens), Fox 

 Lake, Freeport, Homer, Kankakee (Kanka- 

 kee River), Keithsburg, Mahomet (San- 

 gamon River), Milan (Rock River), 

 Momence (Kankakee River), Ottawa, 

 Richmond (Nippersink Creek), Rockford, 

 Rock Island, Savanna, Serena (Indian 

 Creek), Shawneetown, Spring Grove (Nip- 

 persink Creek), Wilmington, Yorkville 

 (Fox River). 



Athripsodes punctatus (Banks) 



Mystacides punctatus Banks (1894, p. 180); 

 9. 



Larva. — Unknown. 



Adults. — Length 10 mm. Color black, 

 the wings with a scattering of flat white 

 scales. Male genitalia, fig. 788: cerci point- 

 ed; tenth tergite robust, with a digitate 

 apical prolongation; claspers with basal seg- 

 ment short, apical segment long and lanceo- 

 late, the mesal process long and stout. Fe- 

 male genitalia, fig. 802: ninth sternite divid- 

 ed into a pair of wide lateral plates and a 

 mesal tonguelike strip, these three areas 



heavily sclerotized, and together making an 

 arcuate apical margin; bursa copulatrix 

 small and vasiform, the connectives chiefly 

 membranous. 



The male illustrated for this species by 

 Betten (1934, p. 259) belongs to uvalo, 

 which is distinguished by the pointed tenth 

 tergite. The male which I am considering 

 true punctatus has been taken in company 

 with the female which agrees in structure 

 of genitalia with a series of females belong- 

 ing to the type lot, from Douglas County, 

 Kansas. 



Allotype, male. — Harrisburg, Illinois: 

 June 15, 1934, at light, DeLong & Ross. 



In Illinois we have taken this species at 

 only two points, both of these in the south- 

 ern part of the state. The nature of the 

 terrain at these two points is such that these 

 specimens could have flown to the lights 

 from either the Ohio River or smaller slug- 

 gish and muddy streams such as the Saline, 

 in the immediate vicinity. 



The only definite records of this species 

 which we have are from Arkansas, Illinois, 

 Kansas and Maine. 



Illinois Records. — Eldorado: Sept. 8, 

 1933, Ross & Mohr, 1$. Harrisburg: 

 June 15, 1934, DeLong & Ross, at light, 

 3^, 1$. 



Athripsodes saccus Ross 



Athripsodes saccus Ross (1938/^, p. 89); d^. 



Larva. — Unknown. 



Adults. — Length 13 mm. Color almost 

 entirely black, tarsi whitish, and front wings 

 with one or two white marks and with a 

 scattering of broad white scales over the 

 entire wing. Male genitalia, fig. 776: cerci 

 short and oval; tenth tergite large, U- 

 shaped, the ventral arm of the U divided 

 into large, lateral prolongations tipped with 

 a cluster of long, peglike setae; claspers 

 with basal segment broad, its apico-mesal 

 margin bearing a dense cone of peglike 

 setae, the apical segment long and lanceo- 

 late, the mesal process long and slender. 

 Female genitalia, fig. 806: ninth segment 

 with cerci well delineated; ninth tergite com- 

 posed chiefly of a single large, sclerotized 

 plate arcuate across the apex ; bursa copu- 

 latrix U-shaped, with a pair of sharp points 

 near the top, these points curving ventrad; 

 bursa attached to short but heavy mem- 

 branous folds, and with a rather thick ven- 



