288 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



transparent, the color pattern formed en- 

 tirely by hair; the entire front wing white 

 with small, yellowish linear spots situated 

 fairly closely along every vein and with the 

 apical fringe brownish; the contrast between 

 the white and yellowish-brown spots small, 

 so that the wing appears only indistinctly 

 speckled. General structure typical for 

 genus. Eyes small. 



Male genitalia in general typical for the 

 genus, with ninth segment with long, some- 

 what hoodshaped dorso-mesal portion and 

 a long pair of finger-like processes below 

 this. Tenth tergite long and projected, apex 

 upturned and narrow. From near base of 

 tenth tergite arise a pair of curved, "swan's 

 neck" organs which are expanded at apex 

 into a reticulate plate. Claspers, fig. 957, 

 with the base expanded into a moderate- 

 sized flap, above this constricted into a fairly 

 wide neck, divided at apex into a spoonlike 

 subapical mesal lobe and an apical, lateral 

 urea which projects some distance above 

 subapical lobe and is fringed with very long 

 setae; between the bases of the clasper arise 

 a pair of medium length curved filaments, 

 each with two or three long setae at apex. 

 Aedeagus mostly membranous and with a 

 spoonlike ventral plate. 



Female. — In size, color and general 

 structure similar to male. Abdomen bright 

 green. Genitalia typical for genus. 



Holotype, male. — Chiefland, Florida: 

 July 17, 1938, W. Stehr. 



Allotype, female. — Same data as for 

 holotype. 



Paratypes. — Florida. — Same data as for 

 holotype, 6 (^ , 3 5 . Winter Park: March 

 25, E. M. Davis, 1 $ ■ March 26, E. M. 

 Davis, Z$; April 9, E. M. Davis, \$. 

 Tavares, Lake County: March 23, 1936 

 F. N. Young, 3 $ . 



Helicopsyche Hagen 



Many collections of this genus, especially 

 from the southwestern states, have consider- 

 ably simplified the picture of the Nearctic 

 species. It is clear that borealis is very 

 widespread over most of the North Ameri- 

 can continent; Banks' species arizonensis 

 proves to be the female of mexicana; and a 

 third species common to both Mexico and 

 the United States appears to be undescribed. 

 I have examined the types of all available 

 Antillean species, and these seem to be quite 

 distinct from the continental species. 



KEY TO NEARCTIC MALES 



1. Claspers with apical corner produced 



into a sharp, triangular point, fig. 



958 



Claspers with apical corner rounded, 

 figs. 960, 961 



2. Sclerotized mesal projection of sixth 



2 

 3 



96IA 



BOREALIS 



Figs. 958-96L — Helicops^che, male geni- 

 talia. Ay lateral aspect; 5, tenth tergite; C, 

 claspers, caudal aspect. 



