June, i9i6.] WeISS : InSECT FaUNA OF GREENHOUSES. 149 



Family SYRPHIDJE. 

 Eristalis tenax Linn. 



The common drone or chrysanthemum fly. Occasionally found 

 in greenhouses during fall. 



Family AGROMYZID^. 



Phytomyza chrysanthemi Kowarz. 



The chrysanthemum leaf-miner or Marguerite fly. Larvae mine 

 leaves and do considerable damage. Has not been found breeding 

 freely outside. 



Summarizing the above list, the orders are represented as follows : 



Strictly Greenhouse Species Which Occur 



Species. In and Out Doors. Total. 



Thysanura i i 2 



Thysanoptera 2 i 3 



Homoptera 4 7 11 



Hemiptera o i i 



Dermoptera i o i 



Orthoptera 2 i 3 



Coleoptera 2 2 4 



Lepidoptera 3 8 11 



Hymenoptera 5 i 6 



Diptera 3 4 7 



Totals 23 26 49 



Including the 32 species of Coccidx. the Homoptera is by far the 

 best represented order, most of the members belonging to the fami- 

 lies Aphidid?e and Coccidae. This is no doubt due to the close rela- 

 tionship which exists between the members of these families and their 

 host plants and also the comparative ease and safety with which they 

 can be transported. The Lepidoptera is the next best represented 

 group followed by the Diptera and Hymenoptera, the remaining 

 orders being poorly represented. The Diptera and Hymenoptera can 

 undoubtedly be added to by breeding out the parasites of the species 

 listed. It was thought unwise however to list the known parasites 

 before they had actually been found in New Jersey under glass. 

 The Coleoptera can also be increased by the identification of two 

 species recently found feeding on orchids. 



Of the total of 49 species listed, 23 are unable to maintain them- 

 selves out of doors, the remaining 26 being equally at home either 

 under glass or in the open. Most of the strictly greenhouse species 



