38 



Illinois Natural History Survey Bulletin 



To/. 23, Art. 1 



Tarsal Claw} ) 



Fig. 135. — PalaeagapeUis cehus, genitalia. 



ous, tipped with a broad brush of curved 

 spines. 



Holotype, male. — Cloudy Creek near 

 Cloudy, Oklahoma: May 4, 1940, Mrs. 

 Roy Weddle. 



Paratypes. — Same data as for holotype, 

 \$. 



The broad, scoop-shaped ventral portion 

 of the aedeagus places this species immedi- 

 ately as a member of the Carolina group. 

 It is distinguished from all the previously 

 described species of this group, however, by 

 the absence of a well-developed dorsal heel 

 on the apical segment of the clasper and by 

 the shape of the tenth tergite. 



The species has not been collected in Illi- 

 nois. The types are from the Kiamichi 

 Mountains of Oklahoma and may indicate 

 an extensive range through the Ozarks, in 

 which case it might eventually be found 

 in Illinois. 



Palaeagapetus Ulmer 



Palaeagapetus Ulmer (1912, p. 35). Geno- 

 type, monobasic: Palaeagapetus rotundatus 

 Ulmer (described from Baltic amber). 



No representative of this genus has yet 

 been taken in Illinois. The only species 

 known from the eastern states, celsus, has 

 been collected in North Carolina and Ten- 

 nessee and is easily recognized in the male 

 by the curious genitalia, fig. 135. Larva 

 unknown. The genus may belong to the 

 Rhyacophilinae. 



GLOSSOSOMATINAE 



This subfamily embraces several genera, 

 three of which have been found in Illinois. 

 The larvae make a saddle case formed of 

 a dome-shaped upper portion with a flat 

 strap across the underside, figs. 136, 137; 

 the larva moves along with the anal portion 

 protruding on one side of the strap and the 

 front end protruding from the other. Be- 

 fore pupation the bottom strap is cut away 

 and the dome-shaped upper portion is ce- 

 mented to a rock or other support. The 

 adults resemble Rhyacophila in shape and 



Fig. 136. — Glossosoma intermedium case. 



Fig. 137. — Protoptila maculata case. 



