August, 1944 



Ross: Caddis Flies of Illinois 



167 



fig. 584: tenth tergite stocky and somewhat 

 hood shaped; claspers with a large, broad 

 basal segment bearing a short, sharp tooth 

 at apex which is nearly as long as the short, 

 sinuate second segment. Female genitalia 

 very wide, the ninth sternite as in fig. 584C. 



Fig. 584. — Fabria inornata, genitalia. A, 

 male, lateral aspect; B, clasper, caudal aspect; 

 C, female, ventral aspect. 



In Illinois we have taken this species only 

 at Zion, where adults have been collected 

 at lights beside the Dead River. In this 

 locality we reared all the species of larvae 

 that we found except one, described below 

 as Genus A. Similarly, all the Phryganei- 

 dae adults which we collected there were 

 reared except one, Fabria. There is a very 

 good possibility, therefore, that Genus A is 

 the larva of this species. Little is known 

 regarding the range of the species. It was 

 described from Minnesota, and this is only 

 the second state record for it. 



Illinois Records. — Zion, Dead River: 

 July 7, 1937, Frison & Ross, 2 9 ; May 28, 

 1938, Mohr & Burks, 1 $ ; June 3, 1938, 

 Mohr & Burks, 2$ ; June 4, 1938, Ross 

 & Burks, 2$ , 19; June 6, 1940, Mohr & 

 Burks, 5 i . 



Phryganeid Genus A 



Larva. — Fig. 566. Length 22 mm. Head, 

 pronotum and legs yellow; head with no 

 mesal line but with two pairs of dark lines, 

 one outside the frons, the other on the lat- 

 eral margin; pronotum with posterior mar- 

 gin black, and each half with a diagonal 

 black line, the two not meeting posterad on 



the meson. Meso- and metanotum without 

 any sclerites near the meson and with a dark 

 purple line on each side of the meson. 



Of the many phryganeid larvae collected 

 in the Dead River at Zion, Illinois, this spe- 

 cies alone was not reared. As explained in 

 the discussion of the preceding species, cir- 

 cumstantial evidence indicates that this 

 might be the larva of Fabria inornata. This 

 larva has been taken only in the Dead River, 

 where it was quite common in the smart- 

 weed beds (see p. 11). We found that it 

 differed from others inhabiting the same 

 location in being unable to withstand our 

 rearing conditions, which were accompanied, 

 unfortunately, by rather high, unseasonable 

 temperatures. 



Illinois Records. — Zion, Dead River: 

 May 18, 1940, Mohr & Burks, 1 larva; 

 May 20, 1940, Mohr & Burks, 2 pupae, 

 many larvae; June 6, 1940, Mohr & Burks, 

 4 larvae; June 16, 1940, Mohr & Burks, 3 

 larvae; June 28, 1940, Mohr & Riegel, 2 

 larvae. 



Oligostomis Kolenati 



Oligostomis Kolenati (1848, p. 80). Geno- 

 type, by subsequent designation of Milne 

 (1934, p. 8): Phryganea reticulata Linnaeus. 



We have only one species of this genus 

 in North America, ocelligera, which has not 

 been taken in Illinois. This species is very 

 striking in coloration, fig. 587, having reticu- 

 late black front wings and black hind wings 



Fig. 585. — Oligostomis ocelligera, male geni- 

 talia. A, lateral aspect; B, ventral aspect; C, 

 dorsal aspect. (After Betten & Mosely.) 



