OF THE FABH AND GAKDEN. 53 



that time I first observed the flies in the fe arden, and now 

 a few are to be found. Their favorite roosting place is a 

 row of asparagus running along the onion-ground, where 

 they are easily captured and destroyed from daylight to 

 sunrise, while it is cool and wet. During the day they are 

 scattered over the ground and on the leaves and stalks of 

 the onions, and not easily captured. Their wings point 

 obliquely backward, outwards and upwards, with an 



jNIVERSITY! 



Fig. 34. BLACK ONION-FLY 



Larva and Fly real size shown by lines. 



irregular jerking, fanlike movement; flight not very 

 rapid or prolonged. They are not very numerous, prob- 

 ably not over two or three hundred. All that I observed 

 originated in one part of the bed, where they were doubt- 

 less deposited by one parent fly." Two broods appear in 

 a season. 



THE IMPORTED ONION-FLY. 

 (Anthomyia ceparum, Bouch.6.) 



The engravings (fig. -35,) show, a, larva; 5, larva mag- 

 nified; c, pupa; d, pupa magnified; e, fly magnified. It is 

 a terrible pest to the onion grower in the East, though 

 it has not yet made its way out West. On the other 

 hand, the Native American Onion-fly ( Ortalis arcuata, 

 Walker), which is a closely allied species and has almost 

 exactly the same habits, has only been heard of in one or 



