Vol. XI] VAN DUZEE— NORTH AMERICAN GRASS-BUGS J 47 



of Oakland, April 12, 1908, April 30, 1911, and May 8, 

 1910; Lagunitas, Marin Co., April 24, 1910, and Muir 

 Woods, Marin Co., May 17, 1908, Dr. E. C. Van Dyke; 

 Mt. Diablo, April 29, 1917; Leona Heights, Oakland, May 

 5, 1918; Ross, Marin Co., March 31, 1918; San Mateo 

 Co., May 19, 1918; Carmel, Monterey Co., March 23, 

 1918, and Bradley, Monterey Co., April 23, 1917, E. P. 

 Van Duzee; Portola Valley, San Mateo Co., May 4, 1917; 

 Santa Cruz Co., June 9, 1917; Dublin Canyon, Alameda 

 Co., May 6, 1917, W. M. Giffard; Santa Clara, April 20, 

 1914, Leroy Childs; Alameda Co., May, 1915, M. C. Van 

 Duzee; Piedmont, Alameda Co., April 22, 1917, J. C. Brad- 

 ley; Oakland, April 3, 1905, and Pasadena, April 30, and 

 July 25, 1909, Fordyce Grinnell. 



This species is found from Los Angeles Co., north at 

 least to Marin Co., and probably much farther. About the 

 Bay region it is often excessively abundant on grass on open 

 hillsides. I have formerly determined this species as sericans 

 Stal, but a study of typical specimens of the latter from 

 Alaska shows them to be very distinct. The Pasadena speci- 

 mens are a little smaller than those from farther north. 



Holotype, male, No. 800, and allotype, female, No. 801, 

 Mus. Calif. Acad. Sci.; E. C. Van Dyke collector. 



Type locality, hills back of Oakland, Calif. 



Paratypes in Academy collection, also in that of the au- 

 thor. 



3. Irbisia mollipes Van Duzee 



(Proc. Calif. Acad. Sci., Ser. 4, VII, p. 264, 1917.) 

 Polished black; pronotal punctures distinct, scarcely show- 

 ing traces of transverse rugae; vestiture long, gray; legs 

 fulvous; sinistral male clasper broadly curved. Length 5y 2 

 to 6 mm. 



Head oblique; length beyond eye hardly more than greatest length of eye; 

 eye well produced and narrowed below; vertex flattened between the an- 

 tennae; temporal areas scarcely distinguished. Segment II of antennae three 

 times length of I; III scarcely longer than IV, these together one- 

 sixth longer than II. Pronotum deeply, distinctly punctured, showing 

 scarcely a trace of the transverse rugae; scutellum obscurely wrinkled: elytra 

 closely, obscurely punctured. Vestiture long, dense, pale, erect on head 

 and pronotum; rostrum attaining base of intermediate coxae. Sinistral male 

 clasper wide and convex at base, broadly curved, its acute apex short and 



