280 CALIFORNIA ACADEMY OF SCIENCES [Pkoc. 4th Sex. 



481. Myiolepta bella Will. 

 Mt. Jefferson; Mary's Peak; Horse Lake, 3,000 to 6,000 

 feet, VI-VIII (Lovett). Oregon is type locality. 



482. Myiolepta varipes Loew 

 Corvallis, V-26. Bigot described it from Mt. Hood as 

 lunula t a. 



483. Pyrophaena granditarsus Forst. 

 Hood River, V and VI (Cole). Common in marshy 

 lands near Hood River, flying about plants of Equisetum. 



484. Platychirus aeratus Coq. 

 Mt. Jefferson, VIII-1 (Lovett). Doubtfully referred 

 here; apparently agrees, except that legs are decidedly 

 lighter in color and pile on face not especially heavy. 



485. Platychirus frontosus Lovett 



Corvallis, V-5 (Nichols) ; Mary's Peak, II I- 19 (Lovett). 

 1919, Proc. Cal. Acad. Sci., Ser. 4, IX, p. 247. 



486. Platychirus hyperboreus (Staeg.) 

 Corvallis; Alsea Valley, IV to VII (Lovett). 



487. Platychirus peltatus (Meig.) 

 Hood River and Parkdale, V and VI (Cole). 



488. Platychirus quadratus (Say) 



Hood River (Cole) ; Mary's Peak, 111-30 (Black). Com- 

 mon at Hood River. 



489. Melanostoma angustatum Will. 

 Pamelia Lake, 3,000 ft., VI 1-27 (Bridwell). 



490. Melanostoma ambiguum (Fall.) 

 Hood River, VII-25 (Cole). 



491. Melanostoma concinnum Snow 

 Philomath, V (Lovett). 



