288 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



550. Eristalis meigenii Wied. 

 A widespread species occurring from New England to 

 Alaska. 



551. Eristalis occidentalis Will. 

 Common. 



552. Eristalis temporalis Thorns. 

 Common. 



553. Eristalis tenax (Linn.) 

 Common. 



554. Tropidia quadrata (Say) 

 Hood River (Cole); Corvallis (Lovett). Fairly com- 

 mon. 



555. Helophilus latifrons Loew 

 Corvallis and Hood River, V and VI (Cole and Lovett). 

 Williston in his Synopsis says, "Mass. to Cal. and Wash." 



556. Helophilus polygrammus Loew 

 Osten Sacken had specimens from Oregon collected by 

 H. Edwards. 



557. Helophilus similis Macq. 

 Fairly common. 



558. Asemosyrphus mexicanus Macq. 

 Reported from Oregon by Osten Sacken. It is a fairly 

 common species in higher altitudes and scatteringly on plains 

 in midsummer. 



559. Mallota sackeni Will. 

 Corvallis, V and VI; Mosier, VI-14 (Cole). 



560. Syritta pipiens (Linn.) 



"Everywhere and at all times abundant from spring to 

 autumn." 



