170 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Fig. 591. — Banksiola selina 9. 



bristles. Tenth tergite forming a dorsal 

 roof wkich narrows from its base and is 

 notched at the posterior margin; on each 

 side near the base is a lateral projection. 

 Aedeagus with a blunt membranous stalk 

 beneath which extends a dark brown, heavi- 

 ly sclerotized flat strap; arising from the 

 base of the aedeagus is a membranous ap- 

 pendage which has on the upper margin 

 of its tip a large number of stout, reddish 

 bristles; this appendage curves down along 

 the side of the aedeagus, generally on the 

 left side. Claspers very heavy, each termi- 

 nating in a strong dorsal hook and with 

 strong teeth along the posterior margin; 

 seen from below the bases of the claspers 

 meet in a straight line. 



Female Genitalia. — Fig. 593. Terminal 

 dorsal segment of abdomen rooflike, not 

 unlike that of the male; near its base is a 

 transverse line of bristles and two bunches 

 of these are located toward the tip. Em- 

 bedded in the ventral wall of the eighth 

 ventral segment is a dark brown, corneous 

 structure, thin in the middle and with in- 

 flated lobes at the sides; at the posterior end 

 of this structure there are two spinose arms 

 and between these a shorter, generally broad 

 and rounded projection also covered with 

 spines. These parts vary greatly. 



Holotype, male. — Zion, Illinois, along 

 Dead River: June 3, 1938, Mohr & Burks. 



Allotype, female. — Zion, Illinois: larva 

 from Dead River, emerged June 12, 1940, 

 Mohr & Burks. 



Paratypes. — Illinois. — Zion: Same da- 

 ta as for holotype, 4? ; July 7, 1937, Frison 

 & Ross, 1^,1$; same data as for allotype, 

 2 9 . Four paratypes are deposited in the 

 collection of Dr. Betten. 



Additional specimens have been examined 

 from Illinois, Massachusetts, Michigan, 

 Minnesota, New York and Ontario. 



This species has heretofore always been 

 identified as concatenata. The type of the 

 latter (described by Betten & Mosely 1940) 

 is a female in which Mg and M^ are sep- 

 arate nearly to the line of anastomosis, much 

 farther than is ordinarily the case in selina; 

 the genitalia of concatenata resemble those 

 of dossuaria more than those of selina. 



The above description was kindly sent to 

 us by Dr. Betten for inclusion in this report. 



In Illinois, with the exception of a single 

 male taken at lights in Champaign, all our 

 records are from the extreme northeastern 

 corner. We have found the species breeding 

 abundantly in the Dead River near Zion, 

 and apparently its main range in the state 

 is in the region containing similar marsh 



Fig. 592. — Banksiola selina, male genitalia. 

 A, lateral aspect; B, claspers, ventral aspect. 



Fig. 593. — Banksiola selina, female genitalia, 

 ventral aspect. 



