OSTEN SACKEN ON WESTERN DIPTERA. 213 



segment; all these spots are connected by the narrow, yellow, ab- 

 dominal margin; ventral segments yellow in the middle, brownish- 

 black on the sides. Femora black, with yellow tips ; tibiae and tarsi 

 yellow ; joints 3 and 4 of front tarsi darker. Wings tinged with yel- 

 lowish anteriorly, with grayish posteriorly ; stouter veins and stigma 

 reddish yellow. 



Rob. — California (G. R. Crotch). A single specimen. 



Stratiomyia barbata Loew, Centur., vi, 9. 



Stratiomyia insignis Loew, Centur., x, 7. 



Stratiomyia maculosa Loew, Centar., vii, 19. 



Stratiomyia melastoma Loew, Centur., vi, 10. 



Odontomyia arcuata Loew, Centur., x, 4. 



Odontomyia megacephala Loew, Centur., vi, 20. 



Clitellaria lata Loew, Centur., x, 9. 



Of these species, I possess S. maculosa, 9 (San Eafael, in April and May, 

 not rare); 8. insignis, $, which, the difference of the coloring of the face 

 notwithstanding, I hold to be the male of maculosa ; and JS. melastoma 

 (Summit Station, Sierra Nevada, July 4, H. Edwards). 



I have furthermore three Stratiomyice and one Odontomyia from the 

 Sierra Nevada (Webber Lake, in July), which I abstain from describing. 



Clitellaria rustica n. sp., $ 9 . — (Altogether black, with a short 

 grayish-yellow pubescence ; knob of halteres white ; wings tinged with 

 dark gray. Length, male, about 6 mm ; female, 7-8 mm . 



Black, but little shining, rather evenly clothed with a grayish-yellow, 

 short, semi-recumbent pubescence ; the disk of the abdomen above gla- 

 brous. Antennse black; eyes densely pubescent; legs black, beset with 

 a dense, short, grayish pubescence ; upper side of tarsi glabrous, deep 

 black. Spines of the scutellum brownish. Wings with a distinct dark 

 gray shade; stigma pale brown ; anal cell closed some distance from the 

 margin. 



Hab. — The Geysers, Sonoma County, California, May 5-7, common ; 

 also in San Geronimo, Marin County, April 19. A male from Webber 

 Lake, Sierra County, July 22, is only 4.5 mm long. Three males and six 

 females. 



Nemotelus sp. — Specimens from the environs of San Francisco (W. 

 Holden) agree with the description of N. canadensis Loew, but the edge 

 of the abdomen does not show any trace of yellow. 



Family TABANID^ * 



California (and with it, probably, the whole western region) is not 

 very rich in Tabanidce, especially when compared to the Atlantic States. 

 Both species and specimens seem to be much less numerous. From the 

 valleys of the Coast Eange, in the environs of San Francisco, I possess 

 only four Tabani, one Chrysops, one Pangonia. A Silvius is common, 



* About the Tdbanidce from the Atlantic States, compare my Prodrome of the Taba- 

 nidse of the United States in the Memoirs of the Boston Soc. N. H., vol. ii. 



