144 Proceedings of the Biological Society of Washington. 



Sphegina californica, sp. n. 



Male. — Similar in color to infuscata and rufiveidris, the thorax black and 

 the abdomen rufous, suffused with fuscous. Legs yellow, hind femora 

 rufous, apical two segments of all tarsi and basal segment of hind pair fus- 

 cous. 



Similar to rufiventris in structure, the arista long and slender, with the 

 pubescence indistinct. Fifth sternite without spinules, the fine hairs very 

 short. Hind legs as in rufiventris. 



Length, 8.5 mm. 



Type and paratype. — Walnut Creek, Calif., March 14 (W. M. Davidson). 



