The Ohio Journal of Science 



Vol. XXII June, 1922 No. 8 



SOME BIONOMICS OF ALPHELINUS SEMIFLAVUS 



(HOWARD)* 



Chalcid Parasite of Aphids 



E. A. HARTLEY 

 Bureau of Plant Industry, Pennsylvania Department of Agriculture 



Contents. 



Page 



General Considerations 209 



Acknowledgments 210 



Methods and Apparatus 211 



Identity and Description 213 



Distribution 213 



Bionomics of Adult 215 



Reproduction and Development 224 



Cohosts 232 



Interrelations with Aphidius 232 



Secondary Parasites 235 



Literature 235 



GENERAL CONSIDERATIONS. 



Aphelinus semifiavus How. is one of a few species from the 

 genus Aphelinus, of the Chalcidoid family Eulophidae, known 

 to attack aphids. The others are scale parasites. At present 

 there are but seven described species for North America, 

 recorded as aphid feeders; namely, Aphelinus mali Hald., 

 A. nigritus How., A. Semifiavus How., A. Flaviceps How., 

 A. Lapisligni How., A. varicornis Gir., and A. automatus Gir. 

 In addition to this number, the writer has recently taken two 

 new species: one from an aphid on potato sprouts in the State 

 Insectary at Whittier, California, and the other from San- 

 hornia juniperi Perg., an aphid on juniper in Pennsylvania. 

 Both are being described by Dr. L. O, Howard. 



* Contribution from the Department of Zoology and Entomology, Ohio State 

 University, No. 70. 



209 



