252 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Triaenodes baris Ross 



Triaenodes baris Ross (1938^, p. 88); &. 



Larva. — Unknown. 



Adults. — Length 11-12 mm. Color taw- 

 ny with the cream and brown pattern shown 

 in fig. 863. Male genitalia, fig. 847: tenth 

 tergite fairly long, simple and fusiform ; 

 cerci very long; claspers with lateral pro- 

 jection short, mesal lobe very large, the 

 basal, recurved rod fairly short, not reach- 

 ing base of aedeagus; aedeagus somewhat 

 U-shaped, apex deeply cleft. Female geni- 

 talia, fig. 858: similar in general appear- 

 ance to tarda but with the apical lobes of 

 ninth sternite projecting more sharply pos- 

 terad and with a sclerotized bar situated 

 above base of bursa supports, the bar en- 

 larged and platelike at each end. 



This species was originally described from 

 Zion, Illinois, and has since been taken only 

 at that locality. We obtained a pupa in the 

 Dead River at Zion, living in a case typical 

 for the genus and indistinguishable from 

 cases of tarda and aba taken in company 

 with it. 



Our collection of this species is so small 

 that there is some doubt as to the associa- 

 tion of male and female. Our assignment 

 of the above female must be considered 

 tentative; hence no allotype is designated. 



Illinois Records. — Zion : June 10, 1933, 

 Mohr & Townsend, \ $ , 1 $ ; along Dead 

 River, June 6, 1940, Mohr & Burks, 1 $ . 



Triaenodes ignita (Walker) 



Leptocerus Ignitus Walker (1852, p. 72); d^ . 

 Triaenodes dentata Banks (1914, p. 261); 

 d^. New synonymy. 



Larva. — Unknown. 



Adults. — Length 11-12 mm. Color taw- 

 ny with the cream and brown pattern of 

 the wing shown in fig. 863. Male genitalia, 

 fig. 842: tenth tergite divided near base 

 into a pair of very long, slender filaments 

 which curve sharply to the left near apex; 

 cerci very long and slender; claspers with 

 the lateral projection slightly curved and 

 sharp, the mesal projection large and quad- 

 rate from lateral view, with small swellings 

 on its dorsal margin, the basal filament 

 ribbon-like at base, filamentous on the apical 

 portion; aedeagus U-shaped, slender in the 

 middle, and with a long, ventral portion. 

 Female genitalia, fig. 856, with no sclero- 



tized apodemes, ninth sternite produced at 

 apex into a pair of long, slender fingers. 



Our only Illinois record of this species 

 is a single male taken at Vandalia, June 22, 

 1940, along the Kaskaskia River, Mohr & 

 Riegel. The species has a scattered distri- 

 bution over most of the eastern states, occur- 

 ring west to Illinois and Oklahoma. Rec- 

 ords are available for Alabama, Georgia, 

 Illinois, New York, Nova Scotia, Oklahoma 

 and Tennessee. 



Triaenodes dipsia Ross 



Triaenodes dipsia Ross (1938^, p. 89); c?. 



This species has not been taken in Illinois 

 but is known from Athens, Ohio, and may 

 possibly be taken in southern Illinois. 



Triaenodes injusta (Hagen) 

 Setodes injusta Hagen (1861, p. 283); cf. 



Larva. — Fig. 836. Length 10 mm. Head, 

 pronotum and legs straw color, the head 

 with two pairs of dorsal lines, the long pair 

 from base of antennae to vertex, and a 

 shorter, interrupted pair along inner margin 

 of frons; pronotum with some irregular 

 spots on posterior portion. 



Adults. — Length 12 mm. Color tawny 

 with the cream and brown pattern shown 

 in fig. 863. Male genitalia, fig. 841 : tenth 

 tergite divided near base into a pair of 

 wide, fairly short, heavily sclerotized diver- 

 gent arms; cerci long and slender; claspers 

 with lateral projection very short, dorsal 

 projection large. Female genitalia, fig. 855, 

 similar to tarda in general outline but 

 distinct from all other species of the genus 

 by the fairly long apodeme of the tenth 

 segment, this apodeme produced at apex into 

 a series of knoblike folds. 



Allotype, female. — Antioch, Illinois: 

 June 27, 1938, Ross & Burks. 



We have taken this species very abun- 

 dantly in the glacial lakes of northeastern 

 Illinois; we have taken only scattered rec- 

 ords from other parts of the state. In the 

 lakes the larvae are found in weed beds. 

 We have reared them from Channel Lake, 

 near Antioch. Most of the adult emergence 

 occurs during June and July. A few speci- 

 mens have been collected in May and Au- 

 gust. Data are insufficient to tell how many 

 generations are produced per year. 



Illinois Records. — Many males and fe- 



