August, 1944 



Ross: Caddis Flies of Illinois 



219 



apical third of the wing and scattered in- 

 definitely over the anterior two-thirds; along 

 the dorsum the wings usually form three 

 large V-marks with small ones between. 

 Sometimes these V-marks are reduced in 

 size, in which case the intermediate small 

 ones disappear, leaving only widely spaced 

 dots. The general appearance is much as in 

 fig. 754; the chief difference is that the cen- 

 tral part of the wing has a few more spots, 

 and the apical portion does not have such 

 black bars; frequently, also, the shoulder 

 spot is present near the base of the wing 

 (well shown in fig. 754), but usually it is 

 absent. General structure typical for genus. 

 Eyes moderately large, separated on venter 

 by twice their width as seen from this view, 

 fig. 760. Genitalia typical for the albida 

 group; ninth segment with dorsal process 

 finger-like, the tenth tergite in the "swan's 

 neck" processes typical for the genus; clasp- 

 ers, fig. 752, with a large basal flap, short 

 narrow neck, the apex divided into a mesal 

 spoon-shaped mesal lobe and a lateral, trun- 

 cate, apical lobe bearing long setae; on the 

 mesal face of the clasper there is a seta- 

 bearing ridge which runs from the base of 

 the mesal, subapical lobe to the anterior 

 corner of the apex, with considerable varia- 

 tion as to the exact detail of this region. 



Female. — Slightly shorter and a little 

 stouter than the male but similar to it in 

 color and general structure; the color pat- 

 tern is almost always reduced in contrast 

 as compared to that of males. Abdomen 

 bright green. 



Holotype, male. — Havana, Illinois: June 

 29, 1936, Mohr & Burks. 



Allotype, female. — Havana, Illinois: 

 June 27, 1936, Mohr & Burks (reared from 

 same lot as holotype). 



Paratypes. — Illinois. — Same data as for 

 holotype, including June 24 to June 29, 

 3<5, 9 9. Algonquin: Sept. 16, 1904, 

 W. A. Nason, 1 $ ; July 2, 1905, W. A. 

 Nason, 1 ; same but June 28, 1 $ ; same 

 but July 26, 1 (? ; same but Aug. 14, 1 9 . 

 Aurora: July 17, 1927, at light, Frison & 

 Glasgow, 19. Richmond: June 24, 1938, 

 Ross & Burks, 1 (? , 6 9 ; same but June 28, 

 1 9 ; same but June 29, 2 ,3 , 19. 



Indiana. — Crawfordsville, Honey 

 Creek: Aug. 10, 1938, Ross & Burks, 19. 

 Noblesville: Aug. 10, 1938, Ross & Burks, 

 2$. 



Michigan. — Niles: July 13, 1914, at 

 light, 1 $ . 



South Dakota. — Brookings: July 11, 

 1919, H. C. Severin, U, 19. 



In characters of the genitalia this species 

 belongs to the albida group and is most 

 closely related to the intervena-texana com- 

 plex. It differs from this latter, however, 

 in lacking close, definite rows of brown 

 marks near the base of the wings, and in 

 having the V-marks on the dorsum (when 

 the wings are folded) or in having three 

 large V-marks separated by small dots. 

 Subsequent rearing of Texas material may 

 show that this species is just a variant of 

 texana, but in the material at hand there 

 seems to be a clear-cut line between the two. 



In Illinois we have taken this species at 

 only scattered places. The larvae have al- 

 ways been found in fairly swift, cool streams 

 such as Quiver Creek and Nippersink 

 Creek. Larvae from both of these localities 

 were reared. Little data are available on 

 adult emergence, but the few records are 

 sufficiently scattered from June to Septem- 

 ber to indicate the possibility of two gen- 

 erations per year. 



The larvae of this species have been taken 

 in company with Candida but quite evidently 

 are much rarer than Candida. 



Available records are from Illinois, Indi- 

 ana, Michigan and South Dakota. So little 

 material has been seen, however, that these 

 records may give little indication of the true 

 range of diarina. 



Illinois Larval Records. — East Peoria, 

 Farm Creek: Aug. 29, 1940, 5 larvae. 

 Havana, Quiver Creek: Aug. 7, 1895, 

 C. A. Hart, many larvae; June 11, 1896, 

 E. B. Forbes, 1 larva; May 28, 1936, Mohr 

 & Burks, many larvae; May 29, 1936, 

 Mohr & Burks, 6 larvae; June 5, 1936, 

 Mohr & Burks, many larvae; June 20, 

 1936, Mohr & Burks, 2 larvae, 1 <? , 29. 

 Spring Grove, Nippersink Creek: June 12, 

 1936, Ross & Burks, 1 larva; June 8, 1938, 

 Mohr & Burks, 5 larvae (reared); June 

 20, 1938, B. D. Burks, 2 larvae, 5 cases, 

 1 pupa (reared). 



Leptocella spiloma new species 



Larvae. — Unknown. 



Male. — Length 12 mm. Head and body 

 straw colored, the legs whitish, all covered 

 with white hair; antennae banded white 

 and black; wings transparent, covered with 

 hair to form a white and brown pattern, 

 fig. 754. In this species the black shoulder 



