Vol. XXXl] ENTOMOLOGICAL NEWS 33 



several adults of E. strigatus were observed flying about in 

 the sunshine and alighting on the plants; several pairs were 

 taken in copulation at this time. The females were seen 

 crawling into crevices in the ground at the bases of the onion 

 plants and ovipositing in the leaf sheaths just above the bulb. 

 Onions taken from the ground at this time contained several 

 sizes of larvae of both E. strigatus and Hylemyia antiqua. 

 This material was kept in the laboratory and the surphid lar- 

 vae pupated in March and April, emerging in late April, and 

 early May, a little later than specimens of the anthomyid 

 maggot from the same bulbs. The small onion bed at Hood 

 River was almost entirely destroyed, an interesting fact, as 

 it is the first recorded instance of this fly attacking onions in 

 the United States. It greatly outnumbered the other onion 

 maggot associated with it. 



I have seen specimens of the adult of E. strigatus from 

 Forest Grove and Corvallis, Oregon, and also in the collection 

 at Vernon, British Columbia, the latter collected near the 

 large onion farms at Kelowna, B. C., by R. C. Treherne. The 

 species is very probably established as an onion pest in other 

 sections along the Pacific Coast. There may be biological 

 races of the species as in the case of the apple maggot; it has 

 so far confined itself to iris and narcissus bulbs in this country. 

 One of the specimens bred from iris at Oyster Bay, New York, 

 mentioned above, is in the writer's collection; it is smaller 

 than individuals bred from onions at Hood River, Oregon, 

 and the colors are more blue and less green and coppery. The 

 antennae In this specimen are lighter colored and the third 

 joint is narrower. 



The larval and pupal stages will not be described at length 

 in this paper. The larvae are quite different in appearance 

 from the common onion maggot, being pale green in color, 

 rather flat and with an ornamented surface having projections 

 along the sides. The posterior re.spiratory process is bright 

 red. The pupa is light brown when mature and resembles 

 that of Pipiza. A description of the adult is given below: 



Eumerus strigatus Fallen. 



Pipiza strigata Fallen. Dipt. Suec. Syrphici, 618, 1817. 



