18 PROCEEDINGS OF THE iSTATIONAL MUSEUM vol. 69 



British Columbia: Kaslo, April 8, 1903 (R. P, 

 Currie). Prince Rupert, June 17, 1919 (H. G. 

 Dyar). 



California : Gold Lake, Plumas County, July 19, 

 1916 (H. G. Dyar). Tahoe City, June 29, 1920 

 (H. G. Dvar). 



Idaho: Moscow Mountain, June 1, 1907 (J. M. 

 Aldrich). 



Montana: Missoula, July 6, 1917 (H. G. Dyar). 

 Glacier Park, June 2G-July 1, 1921 (H. G. Dyar). 

 Belton, June 2, 1921 (H. G. Dyar). Two Medi- 

 cine River, July 27, 1921 (H. G. Dyar). 



Washington : Bremerton, April 29, 1924 (H. G. 

 Dyar). Ashford, June 9, 1921 (H. G. Dyar). 

 Hoodsport, May 3, 1924 (H. G. Dyar). Glacier, 

 June 4, 1917 (H. G. Dyar). 



Wyoming: Yellowstone Canyon, July 6, 1922 

 (H. G. Dyar). 



EUSIMULIUM FRISONI, new species 



A very distinct species characterized bj- simple claws; hind tibial 

 spurs moderate; hind basitarsus with a very slight projection; the 

 following joint rather long, nearly six times as long as broad, with- 

 out a dorsal incision. In other respects similar to mutafum Malloch. 

 Hypopygium: Cerci, anal lobes, and ovipositor flaps usually large. 

 (Plate "l, fig. E). 



2'ype locality. — ^Alto Pass, 111. 



Type.— Female, Cat. No. 28725, U.S.N.M. 



I)i.stnhiitio7i.~I\\'mois, Alto Pass, May 8, 1917 {■ ). 



Named for Theodore Prison, who has assisted our work very 

 materialh' by placing at our disposal the important collection of 

 Simuliidae of the Illinois Natural History Laboratory. 



EUSIMULIUM PECUARUM (Riley) 



(?) SimuUnm invenusttim Walker, List Dipt. Brit. Mus., vol. 1, 1848, 



p. 112. 

 Shmtlhim pecuanim Riley, Rept. Dept. Agr. 1886, p. ,^)12. 

 Prosmiulkim pecuuniiii Mallocii, U. S. Dept. Agr. Bur. Ent., tech. ser. 



No. 26, 1914, p. 21. 



Female. — Entirely blackish; front at narrowest width scarcely 

 more than the width of antenna, with loose pale pile; two basal 

 joints of antenna yellowish brown, mesonotum with three faint longi- 

 tudinal vittae; legs brownish; fore tarsi slender, cylindrical; claws 

 with a basal tooth; hind basitarsus with slight projection: hind 



