OSTEN SACKEN ON WESTERN DIPTERA. 223 



4. Chrysops suedus n. sp. — Female. — Very like C. procUvis, but dif- 

 fers in being smaller; the facial callosities are black and shining on both 

 sides of the dividing furrow; being prolonged anteriorly, they coalesce 

 above the mouth ; the ferruginous space between them is a narrow stripe, 

 interrupted anteriorly. The thoracic dorsum anteriorly shows two dis- 

 tinct gray longitudinal lines, reaching to about the middle of the thorax ; 

 the i^ile on the pleurae is of a paler yellow. On abdominal segments 1 and 

 2, the elongated black square is more distinctly coarctate on the hind 

 margin of the first segment ; on segment 3 there is a yellow dividing line 

 in the middle, but the lateral yellow marks in most cases do not exist. 

 The prevailing color of all the legs is black, with only a little reddish 

 at the base of the four posterior tibiae and tarsi. The design on the 

 wings does not show any important difference. Length 7-8™™. 



Hah. — Webber Lake, Sierra County, California, July -21. Four 

 females. 



The eyes of this species have the normal coloration (like the figure 1 

 in my Prodrome). 



Family LBPTIT3.^. 



As far as the small number of known Leptidce from California enables 

 me to judge, this family exhibits, on the Pacific slope, a more European 

 than Eastern American character. 



The striking forms of golden-haired ChrysopilcBj the principal feature 

 of the fauna of the Atlantic States, are replaced here by small and in- 

 significant species. 



The genus Triptotricha, however, hitherto peculiar to North America, 

 seems equally well represented in the Atlantic and Pacific States. 



The considerable number of Californian species of Symi^lioroimjia and 

 the abundance of specimens are remarkable. 



Triptotricha lauta Loew, Centur., x, 15. — California. 



Triptotricha discolor Loew, Berl. Ent. Zeitschr,, 1874, p. 379. — 

 California. 



I have neither of these species. A specimen which I found near Lake 

 Tahoe, Sierra Nevada, July 19, seems to be different from both. 



■Leptis costata Loew, Centur., ii, 4. — Not rare in Marin and Sonoma 

 Counties, California. The front and hind legs of my five specimens are 

 not as dark as described; but the coloring of the legs seems to be very 

 variable. 



Leptis incisa Loew, Centur., x, 18. — The female alone is described; 

 the male has usually much darker femora ; the coloring of these, how- 

 ever, is very variable in both sexes. One of my females has a pale red- 

 dish scutellum ; another has it black at base, reddish toward the tip. 

 Not rare in Marin County in April. 



Chrysopila HU3IILIS Locw, Berl. Eiit. Zeitschr., 1874, p. 379. — 

 Male. — "Atra, opaca, tota pilis lutesceutibas vestita ; tibioB testacea3, 



