22C 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



mark is always present, and the spotting on 

 the anterior three-fourths of the wing is 

 aLways sparse, with heavy dorsal V-marks. 

 General structure typical for genus. Eyes 

 very large, occupying most of the lateral 

 aspect of the head and, as seen from ventral 

 view, as wide as the distance between them. 

 Male genitalia almost identical with the pre- 

 ceding species; claspers, fig. 753, wnth a very 

 wide basal flap and with the mesal ridge, 

 which continues from the base of the short 

 apical lobe, extending above the dorsal mar- 

 gin of the lateral lobe. There is consider- 

 able variation in the details of these parts. 



Female. — Length 11 mm. Slightly more 

 robust than male and with the spots usually 

 a little smaller but just as contrasting as in 

 the male; abdomen bright green. The eyes 

 are much smaller than in the male but con- 

 siderably larger than the eyes of females 

 of diarina. Genitalia typical for genus. 



Holotype, male. — Junction City, Kansas: 

 July 29, 1938, J. A. & H. H. Ross. 



Allotype, female. — Douglas County, 

 Kansas: July, at light. 



Paratypes. — Kansas. — Same data as for 

 allotype, 10 5, 22$. 



Texas. — Brownsville: Feb. 3, George 

 Dorner, 2 $ ; Feb. 4, George Dorner, 1 5 . 



This species is most closely related to 

 the preceding, differing from it slightly in 

 the pattern but chiefly in the large eyes 

 which, as seen from ventral view, are as 

 wide as the distance between them, fig. 761. 

 The only other described species with large 

 eyes is stigmatica, which is much darker 

 than this species. 



In all the specimens we have seen, the 

 females of this species appear to have a 

 ground color of almost snowy white, with 

 the green of the abdomen showing through, 

 whereas the females of diarina have a 

 ground color which is closer to a straw 

 color or a very pale tawny shade, with the 

 green of the abdomen showing through. 

 ' We have taken only one specimen of this 



species in Illinois, a female collected at 

 Quincy, July 6, 1937, Mohr & Riegel. 

 Little is known regarding the habits of the 

 species, but it appears to have a range 

 centering around Texas and Kansas, ex- 

 tending northeastward with records in Mis- 

 souri and Illinois. As with the preceding 

 species, records are too few to give an ade- 

 quate picture of the range. 



Leptocella albida (Walker) 



Leptocerus albidus Walker (1852, p. 71); cf. 

 Setodes nivea Hagen (1861, p. 281); cf ■ 

 ^Mystacides uwarowii Kolenati (1859;^, p. 

 249). 



Larva. — Fig. 744. Length 11 mm. Head, 

 thoracic sclerites and front legs brownish 

 yellow; the head with a V-shaped dark 

 brown mark along frons, and with ventral 

 portion dark brown; middle and hind legs 

 dark brown to black with lighter areas at 

 the joints, legs without swimming brushes. 



Case. — Length 20 mm., slender and taper- 

 ing, constructed of sand grains and minute 

 fragments of clam shells, smooth in outline 

 and sometimes with a slender twig fastened 

 to one side. Before pupation the lower por- 

 tion is cut off, leaving a case about 15 mm. 

 long which is cylindrical and truncate at 

 both ends. The case for this species is illus- 

 trated in fig. 762. 



Adults. — Length 16 mm. Head and tho- 

 rax almost black, covered with white hair. 

 Front wings nearly white with rows of 

 small gray marks beyond the cord; after 

 the adult has been flying for some time some 

 of the wing hairs come off, after which the 

 veins stand out fairly boldly as in fig. 758. 

 Male genitalia similar to those of diarina, 

 having the same type of clasper with a wide 

 basal flap. 



Until the fauna of Alaska is better known, 

 it is impossible to place Kolenati's uwarowii 

 with certainty, but his illustration of the 

 insect seems to fit this species fairly well. 



Fig. 762. — Leptocella albida, case. 



