ART. 10 THE FAMILY SIMULIIDAE DYAR AND SHANNON 21 



Types. — Two males, paratypes three females, Cat. No. 28334, 

 U.S.N.M. 



Distribution. — Soutpi Dakota: Brookings (J. M. Aldrich). 



EUSIMULIUM MINUS, new species 



This differs from pecuarwm by its smaller size and darker color, 

 projection on the hind basitarsus and dorsal incision on second hind 

 tarsus. 



Female hypopygium: Cerci and anal lobes normal. Genital rod 

 forks triangularly expanded, each with a large single tooth. (Fig. 

 39.) Ovipositor flaps slight. 

 Type locality. — Yosemite, Calif. 



Type. — Female, paratypes 27 females, Cat. No. 28335, U.S.N.M. 

 Fifty-nine specimens, all females, at hand. 



Distribution. — Alaska : Fairbanlcs, June 29, 1921 (J. M. Aid- 

 rich). Katmai, July-August, 1917 (J. S. Hine). 

 California: Yosemite, May 15-17, 1916 (H. G. 

 Dyar). Fallen Leaf, Lake Tahoe, June 5-10 

 1916 (H. G. Dyar). CUo, July 9, 1916 (H. G. 

 Dyar). 

 Idaho: Moscow (J. M. Aldrich). 

 Montana: Belton, June 19, 1921 (H. G. Dyar). 

 Washington: Glacier, June 4, 1917 (H. G. Dyar). 

 Ashford, June 19, 1921 (H. G. Dyar). Olga, 

 July 14 (J. M. Aldrich). 

 Wyoming: Old Faithful, Yellowstone Park, June 

 27, 1922 (H. G. Dyar). 



EUSIMULIUM CLARUM, new species 



SitnuUum meridionale Malloch (part), U. S. Dept. Agr., Bur. Eat., tech. ser., 

 No. 26, 1914, p. 50. 



Fem/iZe. — Resembles johannsen% but differs in having smaller dor- 

 sal plates on abdomen, which are bluish gray; the pile on abdomen 

 is sparser and tends to be more scale-like; stem vein pale pilose. 

 Otherwise as in minus. 



Female hypopygium as in minus. (Fig. 38.) 



Male hypopygium. Side piece conical, longer than wide, with 

 bridge and short reentrant piece. Clasper thick, the tip drawn out at 

 one angle, with a small inserted tooth. Adminiculum broad, arcuate, 

 hirsute, the dorsal prongs short, pointed, directed straight basally. 

 Adminiculum arms a long folded ridge, the inner conjoined area as 

 long as side piece, double, brown, the outer ridge with many large 

 teeth in a row; side plates small, chitinized, fimbriate. (Figs. 52 

 and 53.) 



Fifteen specimens. 



