|48 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



straight; dextral short, but little surpassing the subacute ventral apex of the 

 genital segment. 



Color, polished black obscured by the heavy vestiture above; beneath 

 polished black. Rostrum, apex of coxae and legs fulvous; margin of coxal 

 cavities and orifices yellowish white; rostrum and tibiae infuscated at apex; 

 membrane uniformly smoky or with a very faint pale mark at apex of the 

 cuneus. 



This species was founded as a variety of calif ornica, then 

 misidentified as sericans. It is readily distinguished from 

 calif ornica by the form of the male claspers and the red 

 legs. Material is before me from the following localities 

 in California in addition to those listed in the original de- 

 scription: Ross, Marin Co., March 31,1918; San Luis 

 Obispo, April 24, 1919; Santa Cruz Island, May 17, 1919; 

 Keen Camp, San Jacinto Mountains, June 8, 1917, Alpine, 

 San Diego Co., March 11, 1914, E. P. Van Duzee; Pasa- 

 dena, April 9 to May 1, 1909, Fordyce Grinnell; top of 

 Las Vegas Range, N. M., June 28, 1902. The holotype 

 was taken in Santa Cruz Co. by Mr. W. M. Giffard. 



4. Irbisia arcuata, new species 



Black, polished; vestiture white, short, appressed; face in 

 profile regularly convex; legs fulvo-testaceous or castaneous 

 on the femora, the tibiae paler. Length 6 mm. 



Head nearly vertical, produced beyond eye for a space nearly twice length 

 of eye; eyes small, oval, little produced and narrowed below; vertex seen 

 from side regularly arcuated from base to apex of clypeus; temporal areas 

 scarcely elevated, a little shagreened posteriorly. Segment II of antennae 

 2J/2 times length of I; III one-half longer than IV, these together one-fourth 

 longer than II. Pronotum strongly, transversely, rugosely punctured ; cal- 

 losities moderately elevated, shagreened, not conspicuous; scutellum strongly 

 transversely wrinkled ; elytra closely, distinctly punctate. Vestiture not dense, 

 short, white, appressed. Beneath polished, minutely shagreened, the venter 

 with longer appressed white hairs. Sinistral male clasper rather wide, broadly 

 curved, flattened and obtuse at apex; dextral clasper long, surpassing the, 

 genital segment by one-half its length and attaining apex of sinistral. 



Color, deep polished black; rostrum and legs fulvo-testaceous; femora more 

 or less rufous or castaneous; tibiae paler, their spines black; tarsi black; 

 prosternum anteriorly, apex of coxae and margin of coxal cavities whitish. 



Described from one pair taken by me at Sunset, Colo., 

 July 19, 1907, at an elevation of 8000 feet, and one pair 

 labelled "Colo." received in exchange from Prof. C. F. 

 Baker. The latter have the apical half of segment I of the 

 antennae castaneous. One male taken by me at Sunset with 



