329 



rower yellow stripes on the dorsum slightly expanded in front and 

 not reaching beyond. the transverse suture; scutellum yellow, the base 

 black; pleurae with a large yellow spot in front of the wings, and a 

 smaller oblong one under it; the black opaque abdomen has a sub- 

 triangular yellow spot on each side of the second segment, a larger, 

 semi-elliptical spot on each side of the third segment, a somewhat 

 similar, but smaller, pair of spots on the fourth segment, a large tri- 

 angular spot on the last segment ; all these spots are connected by the 

 narrow, yellow, abdominal margin; ventral segments yellow in the 

 middle, brownish black on the sides. Femora black v/ith yellow tips ; 

 tibiae and tarsi yellow; joints 3 or 4 of front tarsi darker. Wings 

 tinged with yellowish anteriorly, with grayish posteriorly; stouter 

 veins and stigma reddish yellow. 



"Hab. — California (G. R. Crotch). A single specimen." 



This species may belong to the genus Buparyphns; the third joint 

 of the antennae — the best character for the separation of the genera — 

 was missing from the type. I have not seen any specimens either of 

 Oxycera or Buparyphns that agree entirely with Osten Sacken's de- 

 scription, though two males of a species of Buparyphns in Professor 

 Aldrich's collection from Idaho and Colorado agree fairly well with 

 it. The submedian yellow thoracic vittae do not extend much beyond 

 the suture in these specimens, but the third vein is unforked — a charac- 

 ter that it is improbable Osten Sacken would overlook. The length 

 given for crotchi, 8 mm., exceeds that of any other member of the 

 genus Oxycera from North America. 



Originally described from California and not subsequentlv re- 

 corded. 



Oxycera ai^drichi, n. sp. 



Male. — Black, shining, with lemon-yellow markings. Head black ; 

 face with a white pollinose line on lateral margins which extends 

 along the sides of f rons, and 2 yellow spots below bases of antennae ; 

 antennae apically brown ; mouth parts yellow. Thorax with the same 

 yellow markings as in variegata. Abdomen with the following yel- 

 low markings : a large basal spot which is slightly narrowed posterior- 

 ly, a larger similarly shaped transverse spot on middle of third seg- 

 ment, a pair of minute rounded submedian spots on fourth segment, 

 a large subtriangular spot on fifth, a small lateral spot on second, a 

 large anteriorly curved one on lateral margins of third and a nar- 

 rower similarly curved one on fourth; venter black, the lateral mar- 

 gins yellow. Coxae black, legs reddish yellow. Wings clear, veins 

 yellow. Halteres lemon-yellow, stems reddish. 



