OSTEN SACKEN ON WESTERN DIPTERA. 331 



sometimes narrowly interrupted in the middle; segment 5 has yellow 

 sides and two yellow streaks in the middle; the hypopygium is black, and 

 unusually small for a Sphwrophoria. Legs dark brown or black ; the ends of 

 the middle and front femora to a greater or less extent brownish-yellow. 

 Wings with a distinct brown tinge. Length 7.5-9 mm . 



Hal). — California (the Geysers, Sonoma County, May 5-^7; San Rafael, 

 May 29 ; Brooklyn, near San Francisco, July 11). Seven males. 



Easily distinguished by the very small, black hypopygium, the color 

 of face and front, the dark legs, etc. The dark metallic color of the 

 cheeks sometime extends along the interval between the occiput and 

 the posterior oral margin ; sometimes there is in that interval a more 

 or less extensive yellow spot. 



Allograpta fracta n. sp. — Male. — Face, including the frontal tri- 

 angle, pale yellow, slightly opalescent; a bluish-black stripe extends 

 from the oral edge to the antennas, forming a semicircle above them ; 

 antennae reddish, third segment brown along the upper edge; vertex 

 black. Thorax bright metallic green, a pale yellow stripe on each side 

 between the humerus and the root of the wings ; antescutellar callosity 

 yellowish; scutellum of a saturate yellow, the extreme corners dark ; 

 halteres with yellow knobs. First abdominal segment metallic green- 

 ish-black, its extreme anterior margin only yellow; the rest of the abdo- 

 men black, opaque; an interrupted yellow cross-band on the second 

 i segment, equal to about one-third the segment in breadth; a somewhat 

 broader, slightly arched, and not interrupted yellow cross-band on the 

 I third segment; on the fourth, two narrow, parallel, longitudinal lines in 

 the middle, and an obliquely placed, large, oval spot on each side of 

 them, yellow; the narrow fifth segment shows a yellow picture, some- 

 what resembling that of the fourth segment. Legs yellow ; tips of tarsi 

 brownish; hind femora with a brown ring before the tip; hind tibiae 

 with two such rings, one before the middle, jthe other before the tip ; 

 hind tarsi brown, except the under side of the first joint. Wings hya- 

 line; stigma brownish-yellow. Length 7 mm . 



Hab. — Santa Monica, Cal., February 20, 1876. A single male. 



Observation. — I perceive, even in the dry specimen,, the difference 

 between the larger facets of the upper half of the eye, and the smaller 

 iones of the lower half, a character which I have pointed out as dis- 

 tinctive of the new genus Allograpta (see Buff. B,ull. IS". EL, iii, 4=9),. 

 The coloring of the abdomen of this species is similar in character to 

 that of the typical A. obliqiia Say. 



Sphegina. — A siugle female, from Lagunitas Creek, Marin County, 

 California, April 15, black, with a red abdomen and red legs, seems to 

 differ from 8. infuscata Loew from Sitka (Ceutur., iii, 23). 



Baccha lemur n. sp. — Wings hyaline, with an incomplete brown 

 Jcross-band between the stigma and the fourth posterior cell; abdomen 

 with two red cross-bands. Length 10-ll mm . 



Front and vertex metallic greenish- black, the former (in the ?) 

 10 HB 



