August, 1944 



Ross: Caddis Flies of Illinois 



139 



material is the species described by Betten. 

 The coiled spiral of the aedeagus and the 

 lobes of the aedeagus head indicate this; 

 in Betten's illustration of the side view of 

 the genitalia (1934, pi. 14, fig. 5), the ap- 

 parent hook of the eighth segment is un- 

 doubtedly a silhouette of the hooklike tenth 

 tergite. 



We have only a single male from Illinois, 

 collected along a small creek near Momence, 

 June 22, 1938, Ross & Burks. The only 

 other available records for the species are 

 from Indiana and New York. It is probable 

 that this species, like many others in the 

 genus, has a wide but scattered range. 



Oxyethira verna Ross 



Oxyethira verna Ross (1938rt, p. 118); c?'. 



Adults. — Length 2.7 mm. Color a salt- 

 and-pepper mixture of cream and brown, 

 predominantly light. Male genitalia, fig. 

 491, with ninth segment produced internally 

 into a long, ventral lobe; claspers fused on 

 meson, tenth tergite somewhat platelike, 

 with a pair of styliform appendages, and 

 aedeagus simple, with a large tooth near 

 base of apical portion. 



To date we have only two Illinois records 

 for this species, both of them in the extreme 

 northeastern corner of the state. Nothing 

 is known regarding the biology or habitat 

 preference of the species. The only record 

 outside of Illinois is from New Brunswick, 

 indicating a wide but probably local range. 



Illinois Records. — Spring Grove: June 

 12, 1936, Ross & Burks, U. Willow 

 Springs: 2 $ . 



Oxyethira forcipata Mosely 



Oxyethira forcipata Mosely (1934^, p. 153); 



Not yet taken in Illinois. It occurs to 

 the north and east, with records available 

 for New York, Ontario, Virginia and Wis- 

 consin. 



Oxyethira zeronia Ross 



Oxyethira zeronia Ross (1941^, p. IS); cf. 



Adults. — Length 2.5 mm. Color a salt- 

 and-pepper combination of yellow and 

 brown. Male genitalia, fig. 490: eighth seg- 

 ment produced into a pair of earlike apico- 

 ventral lobes; ninth segment appearing tri- 



angular from side view with a very long in- 

 ternal ventral projection which is narrow 

 and pointed; claspers minute and biscuit- 

 like; tenth tergite hooklike; aedeagus with 

 a slender base, no distinct neck, the apical 

 portion divided into two slender rods, one 

 pointed, the other sinuate with a round api- 

 cal knob. 



Originally described from upper Michi- 

 gan, this species has been identified since 

 from only two localities in extreme north- 

 eastern Illinois. Nothing is known of its 

 immature stages or general distribution. 



Illinois Records. — Richmond: Aug. 15, 

 1936, Ross & Burks, 1^. Spring Grove: 

 Aug. 12, 1937, at light, Ross & Burks, 1 $ . 



Oxyethira dualis Morton 



Oxyethira dualis Morton (1905, p. 71); cf. 



Not yet taken in Illinois. It is very widely 

 distributed, occurring across the entire con- 

 tinent, but has not been taken many times. 

 We have a record from Meramec Springs 

 at St. James, Missouri, which is only a 

 short distance from Illinois. Records are 

 available for California, Missouri, New 

 Mexico, New York, Texas and Virginia. 



The female, which has not been described 

 before, has the following diagnostic charac- 

 ters, fig. 496: eighth sternite tapering and 

 produced at apex into a rounded lobe; tenth 

 segment short and relatively wide; bursa 

 copulatrix with a sclerotized, vasiform basal 

 portion to which is attached an apical, mem- 

 branous portion culminating in a somewhat 

 lock-shaped ventral process. 



Allotype, female. — Pecos River, Carls- 

 bad, New Mexico: April 29, 1939, J. A. 

 & H. H. Ross. 



Orthotrichia Eaton 



Orthotrichia Eaton fl873, p. 141). Geno- 

 type, here designated: Hydroptila angustella 

 McLachlan. 



Only two Nearctic species in this genus 

 are known; both occur in Illinois. To date 

 I have found no characters to separate these 

 two in the larval stages. 



KEY TO SPECIES 



Adults 



1. Apex of abdomen with platelike, con- 

 spicuous appendages, fig. 499 (males) 2 



