OSTEN SACKEN ON WESTERN DIPTERA. 213 



segTuent ; all these spots are coimected by the narrow, yellow, ab- 

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

 black on the sides. Femora black, with yellow tips ; tibise 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. 



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



Stratiomyia baebata Loew, Centur., vi, 9. 



StratiomyiA iNSiGNis Loew, Centnr., x, 7. 



Stratiomyia maculosa Loew, Centur., vii, 19, 



StratiomyiA melastoma Loe-w, Centur., vi, 10. 



Odontomi^ia arcuata Loew, Centur., x, 4. 



Odontomyia megacephala Loew, Centur., vi, 20. 



Clitellaria lata Loew, Centur., x, 9. 



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

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

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

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



I have furthermore three Stratiomyke and one Odontomyia from the 

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



Clitellaria rustica n. sp., ^ ? . — (Altogether black, with a short 

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

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



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

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

 brous. Antennae 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. 



Hah. — 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™™ long. Three males and six 

 females. 



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

 Holden) agree with the description of iV^. 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 Tabanida', especially when compared to the Atlantic States. 

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

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

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



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

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



