200 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



appearance. Male genitalia, fig. 690, with 

 tenth tergite forming a pair of appressed, 

 heavily sclerotized, narrow plates angled 

 sharply dorsad; cerci short and clavate; 

 claspers small and padlike. Female geni- 

 talia, fig. 691, with the ninth segment ap- 

 pearing as a thick collar almost completely 

 surrounding the tubular tenth, the cerci re- 

 duced to indistinct small cushions on the 

 posterior margin of the "collar." 



The eastern species, difficilis, is illustrated 

 by Betten & Mosely (1940). 



For years we were puzzled by two fe- 

 males of this species in the Illinois Natural 

 History Survey collection labeled "Havana, 

 111., November 8, 1912." Diligent search in 

 the vicinity of Havana did not produce any 

 caddis flies still on the wing at this date. 

 Finally, however, a large series of the spe- 

 cies was taken along a small, clear, spring- 

 fed brook just south of Havana at Ma- 

 tanzas. At this time only a few cases were 

 ^ound in the stream. Continuing the search 

 the next year, it was discovered that the 

 larvae were congregated in a little seepage 

 area near the bank and were thriving in 

 water scarcely deep enough to cover their 

 cases. Many of the individuals were feeding 

 on leaves and twigs so that most of the 

 insect and its case was actually out of water. 

 Later we found that odd specimens would 

 live in the stream itself; and, since the 

 seepage areas frequently dried up, it is possi- 

 ble that this reservoir in the stream is chief- 

 ly responsible for the preservation of the 

 species in this area. 



The habits of this species certainly repre- 

 resent an intermediate stage between the 

 typical caddis fly and one or two humus in- 

 habiting species reported from Europe. 



We have taken the species nowhere else 

 in Illinois. The center of its range is appar- 

 ently in the Northeast; records are avail- 

 able from the District of Columbia, Mary- 

 land, Massachusetts, Michigan, Minnesota, 

 New Hampshire, New York, Pennsylvania 

 and Virginia. 



Illinois Records. — Havana, Matanzas 

 Lake: Nov. 15, 1939, Ross & Burks, 5^, 

 4$, 5 mating pairs, many larvae; June 2, 

 1940, H. H. Ross et al., many larvae; Sept. 

 30, 1940, Mohr & Burks, many larvae. 



Glyphopsyche Banks 



Glyphopsyche Banks (1904r, p. 141). Geno- 

 type, by original designation: Glyphopsyche 

 bryanti Banks. 



Contains only two species: irrorata, 

 known from Arctic America, British Co- 

 lumbia and Ontario; and missouri. 



Glyphopsyche missouri new species 



Larva. — Length 14 mm. Head, thoracic 

 plates and coxae mostly black, with a few 

 reddish blotches; trochanters dark red; 



693 A 



Figs. 692-693. — Glyphopsyche, genitalia. 

 A, male, lateral aspect; B, aedeagus; C, spiny 

 area of male eighth tergite; D, female, ventral 

 aspect. 



femora, tibiae and tarsi red with apical 

 black band. Pronotum with short, stout 

 black spines. 



Case. — Irregular and cylindrical, con- 

 structed of a mixture of stones and pieces 

 of twigs. 



Male. — Length 1 1 mm. Color mottled 

 shades of brown, without distinct pattern. 

 General structure typical for the genus. 

 Eighth tergite with a black cushion of short 

 setae, the cushion divided into a mesal and 

 two lateral lobes. Male genitalia, fig. 692, 

 remarkably similar to irrorata, fig. 693. 

 Tenth tergite short and sharp. Cerci bi- 

 lobed and small. Claspers long and stout, 

 with the apex slightly concave on mesal side. 



