284 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Se«. 



517. Syrphus ribesii (Linn.) 

 Common in Willamette and Hood River Valleys. 



518. Syrphus ruficauda Snow 

 Dee, VI- 17 (Cole). 



519. Syrphus sodalis Will. 

 Corvallis (Lovett). 



520. Syrphus torvus O. S. 

 Common in many parts of Oregon. 



521. Syrphus umbellatarum (Fabr.) 

 Freewater, IX-X (Moznette) ; Mary's Peak; Mt. Jeffer- 

 son, VII and VIII (Lovett). 



522. Syrphus velutinus Will. 

 Described from Mt. Hood. 



523. Allograpta fracta O. S. 

 Common. 



524. Allograpta obliqua (Say) 

 Common. 



525. Xanthogramma aequalis (Loew) 

 Dee, VI- 17 (Cole). 



526. Mesogramma boscii (Macq.) 

 Forest Grove, V-5 and Hood River, VII-20 (Cole). 



527. Moso gramma gemminata (Say) 

 Common. 



528. Mesogramma marginata (Say) 

 Common. 



529. Sphaerophoria cylindrica (Say) 

 Common. 



