August, 1944 



Ross: Caddis Flies of Illinois 



287 



by Banks in Astoplectron Banks, also be- 

 longs here. I have studied cleared prepara- 

 tions of both Banks' and Hagen's types, 

 and they appear identical. 



Psilotreta frontalis Banks 



There is considerable variation in the 

 shape of the apical blades of the tenth ter- 

 gite, the holotype of gameta representing the 

 narrow extreme, fig. 955, and the holotype 

 of frontalis representing a wide extreme in 

 which these blades are nearly as wide as in 

 fig. 954. Intergrades in addition to both 

 extremes have been taken at nearby locali- 

 ties in New York. 



Psilotreta labida new species 



The shape of cerci and tenth tergite indi- 

 cates that this species is most closely re- 

 lated to indecisa but is readily separated 

 from that and other species of the genus 

 by characters given in the preceding key. 



Male. — Length 12 mm. Color almost 

 entirely black, the legs and mouthparts with 

 lighter areas of grayish brown; wings gray- 

 ish brown, fairly dark, with very small and 

 irregularly scattered lighter dots. Maxil- 

 lary palpi with first two segments short, 

 the second with a long mesal brush which 

 usually extends the full length of, and is 

 usually appressed to, the third segment; 

 third segment as long as the first and 

 second combined, fourth half the length of 

 third, and fifth slightly longer than third; 

 the fifth also has a basal brush of long hair 

 which extends almost the full length of the 

 segment and gives it a bushy appearance. 

 Male genitalia as in fig. 954. Ninth seg- 

 ment deep, narrowed at the point of inser- 

 tion of the cerci, and forming a long, narrow 

 dorsal tongue which is fused with the tenth. 

 Tenth tergite with its apex divided into a 

 pair of long, curved, pointed wide sclerites; 

 at the base of each of these is a curled hook. 

 Cerci long and somewhat pointed, widest 

 near base. Claspers with basal segment 

 robust and fairly short, apical segment also 

 fairly short and small, with two or three 

 short, sclerotized lateral teeth and a long, 

 sharp mesal tooth. Aedeagus tubular and 

 curved, typical for genus. 



Female. — In size, color and general 

 structure similar to male. Maxillary palpi 

 of approximately the same proportion as in 

 the male but without brushes. Genitalia 



simple, without processes or conspicuous 

 characters. 



Holotype, male. — Cedar River near In- 

 dian Lake, Adirondack State Park, New 

 York: June 20, 1941, Frison & Ross. 



Allotype, female. — Same data as for 

 holotype. 



Para types. — Maryland. — Garrett 

 County: June 6, 1931, J. H. Roberts, 1 $ , 



UM. 



New Hampshire. — Whitcherville Brook 

 near Benton: June 21, 1941, Frison & 

 Ross, 2 $ . 



New York. — Same data as for holotype, 

 2S , 1 9 . Small creek near Tahawus, Ad- 

 irondack State Park: June 20, 1941, Frison 

 & Ross, 1$. McLean, Seaver County: 

 June 13, 1935, M. E. Davis, 1 £ . 



Pennsylvania. — Penn's Creek, Union 

 County: May 16, 1938, C. M. Wetzel, 

 \S. Monroe County, near Swiftwater: 

 1928, F. R. Nevin (Lot 258), 2$, 19. 



Tennessee. — Elkmont, fork of Little 

 Pigeon River: May 27, 1934, T. H. Frison, 



u. 



Virginia. — Curles Neck Bridge: April 

 19, 1938, M. E. Davis & D. T. Ries, U. 



Leptocella tavara new species 



The claspers, fig. 957, which have a large, 

 truncate apical head and a moderate-sized 

 basal flap, readily distinguish this species 



Fig. 957. — Leptocella tavara, claspers. 



from all other Nearctic members of the 

 genus. The well-developed basal flap will 

 separate the species from exquisita and Can- 

 dida, these two having no flap; ail other 

 species of the genus have the flap much 

 larger, as in fig. 752. 



Male. — Length 13.5 mm. Head and body 

 light brown to straw colored, the legs below 

 coxae almost white; head, body and legs 

 clothed with white hair. Wing membrane 



