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JOURNAL OP ECONOMIC ENTOMOLOGY 



[Vol. 8 



{Mamestra picta Harr.), yeliow-bear caterpillar (Diacrisia virginica 

 Fab.), white-lined sphinx {Deilephila lineata Fab.), tarnished plant-bug 

 {Lygus pratensis Linn.), and twelve-spotted Diabrotica {Diahrotica 

 12-punctata Oliv.). 



XII Insects Bred from Decayed Onions 



A number of insects breed in onions after the imported onion fly 

 larvse have caused decay. Stable fly {Stomoxys calcitrans Linn.) 

 larvae were found feeding in company with the imported onion fly 

 maggots, or in decaying onions which the latter had deserted. The 

 adults were often reared under field and laboratory conditions. 



Glischrochilus (Ips) fasciatus Oliv., and its larvae were observed feed- 

 ing in decaying onions, which were or had been infested with the im- 

 ported onion fly larvae. The beetle and its larvae were commonly 

 found in decaying onions which had been plowed under as a fertilizer. 



NOTES ON THE BROWN LACE-WING^ 



{Hemerohius pacificus, Bks.) 

 By Geo. F. Moznette, Oregon Agricultural College 



A study of the above species was begun in the early part of Novem- 

 ber, 1913, and numerous observations have been made in the field, 

 while breeding experiments have been conducted in the laboratory. 



This species, a member of the order Neuroptera, is of considerable 

 economic importance in that it is predaceous in its larval stage upon 

 the Aphididce or plant lice, Acarina or mites, and probably other soft- 

 bodied insects.. It was found to be particularly important in destroy- 

 ing the oviparous females of the Rosy Apple Aphis, Aphis sorbi Kalt., 

 and the Currant Aphis, Myzus ribis Linn. However, this species preys 

 upon almost all species of Aphididce, and during July, 1913, it was 

 found quite abundant in hop yards feeding upon the wingless females 

 of the summer generations of the Hop Aphis, Phorodon humuli Schrank, 

 and also on the Red Spider of the Hop, Tetranychus telarius Linn. 



Specimens in the college collection are recorded from Vale in eastern 

 Oregon, and Corvallis and Oregon City in western Oregon. It is an 

 important economic species in California, and is also found in the 

 states of Washington, New Mexico, Arizona, and the province of Brit- 

 ish Columbia. We can then assume that it is distributed over the 

 Pacific Coast regions. 



1 This article is published with the permission of Prof. H. F. Wilson as a contribu- 

 tion from the Entomological Department of the Oregon Agricultural College. 



