282 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



strong, tawny on head, dark brown on meso- 

 notum. Front tibiae with basitarsus longer 

 than succeeding segments. Eighth tergite 

 without patch of dark spines. Genitalia 

 as in fig. 940. Ninth segment very narrow 

 on dorsum and venter but wide laterally. 

 Tenth tergite forming a pair of long, curved, 

 somewhat flattened processes with a sclero- 

 tized ridge on meson at apex. Cerci also 

 very long, finger-like, with a heavily scle- 

 rotized bar across mesal face near apex. 

 Clasper short and rounded, somewhat flat- 

 tened, with a black, spurlike mesal projec- 

 tion. Aedeagus with lateral arms long, end- 

 ing in a sharp mesal process and a some- 

 what spatulate, hairy lateral process. 



Female. — Similar in general color and 

 structure to male except for five-segmented 

 maxillary palpi. Genitalia as in fig. 940. 

 Ninth sternite wide, with a large apico- 

 mesal triangle and with lateral margins pro- 

 duced into somewhat angular apical corners. 

 Tenth segment forming a sclerotized paired 

 structure, appearing somewhat rectangular 

 from ventral view but with each lobe deeply 

 excavated from dorsal view. 



Holotype, male. — Near McMinnville, 

 Oregon: Nov. 2, 1937, Kenneth Fender. 



Allotype, female. — Same data as for 

 holotype. 



Paratypes. — British Columbia. — ^Van- 

 couver: Sept. 16, 1932, H. H. Ross, 1 5 ; 

 April 15, 1932, H. H. Ross, 1?. 



Oregon. — Brownsville: Aug. 19, 1907, 

 1 $ . Same data as for holotype, I S , 15; 

 same but Sept. 20-Oct. 2, 1938, 1 c? , 2 ? . 



Washington. — Chehalis: Oct. 14—18, 

 1911, M. A. Yothers, 1 c?. Pullman: \S, 

 69; May 29, 1897, 19; May 14, 1898, 

 1 9 ; Aug. 6, 1898, 1 9 ; Aug. 10, 1898, 1 9 ; 

 Aug. 25, 1898, 1 9 ; Sept. 26, 1898, 1 9 ; 

 May 13, 1904, \S ; June 6, 1908, U. 



Paratypes are deposited with the holo- 

 type and also in the collection of Washing- 

 ton State College. 



Limnephilus frijole new species 



This species is most closely related to 

 aretto, differing chiefly in the curious arcu- 

 ate apex of the tenth tergite. 



Male. — Length 15 mm. Color tawny 

 brown, the body, legs and wings marked 

 with small dark brown lines and dots which 

 give the species a salt-and-pepper mottling. 

 Macrochaetae of head and thorax long and 

 stout, dark brown. Front basitarsus longer 



than half length of succeeding segment, 

 front femur with a long inner patch of 

 minute black spines. Eighth tergite with a 

 produced area bearing a patch of dense short 

 spines. Genitalia as in fig. 941. Ninth seg- 

 ment straplike across dorsum, moderately 



Fig. 941. — Limnephilus frijole, genitalia. 

 Male: A, lateral aspect; B, aedeagus. Fe- 

 male: C, ventral aspect; D, lateral aspect. 



wide across lateral area. Tenth tergite 

 composed of a pair of sclerotized plates 

 with a flanged, arcuate apex. Cerci short 

 and triangular, with a short platelike pro- 

 jection on meson. Claspers simple, short, 

 wide and with apical margin concave. Aede- 

 agus with center style and lateral arms very 

 long, lateral arms bent sharply near apex 

 and bearing a brush of moderately short 

 spines. 



Female. — Length 18 mm. General struc- 

 ture typical for male. Genitalia, fig. 941, 

 with very simple parts. Ninth segment 

 almost cylindrical, the sides somewhat flat- 

 tened. Tenth segment tubular, the dorsal 

 portion fairly evenly rounded, the ventral 

 portion produced into a narrow mesal keel. 



Holotype, male. — Manzaneta Spring, 

 Frijole, Texas: April 26, 1939, J. A. & 

 H. H. Ross. 



Allotype, female. — Same data as for 

 holotype. 



