44 ENTOMOLOGICAL NEWS [Feb., *2O 



A group of Onagra plants were examined at intervals at 

 Fargo, North Dakota, on Aug. I, 1919, the number of open 

 flowers removed each time were: 



8:30 P. M. 6 11:00 P. M. o (3 nearly open) 



9:00 P. M. 48 Aug. 2. 



9:30 P. M. 29 6:00 A. M. 28 



10:00 P. M. 16 9:00 A. M. o 



10:30 P. M. 12 12:00 M. o 



No bees were seen and none of the species described are 

 known to occur in that locality. 



Some Notes on the Occurrence of Delphacinae 



(Hemip. Homop.) 



By C. S. SPOONER, Urbana, Illinois.* 



During several* years the writer has spent considerable 

 time collecting Hemiptera, making a special effort to obtain 

 specimens of Delphacinae. In the course of this collecting 

 he has been impressed with the fact that the species of this 

 sub-family usually occur in what might be termed "pockets"; 

 small areas, differing but slightly from the surrounding en- 

 vironment, very rich in genera and species. 



The following notes will serve to substantiate this. While 

 collecting at Middletown, New York, in July, 1910, the writer 

 took a number of species in a pasture east of the city. The 

 pasture was bordered on the east and for a few yards on the 

 south by woodland. In the southeast corner of the pasture 

 the following species were taken: Liburnia canipestris VanD., 

 L. hitulenta VanD., L. osborni VanD., Pissonotus bninneus 

 VanD., P. marginatus VanD., and P. divaricatus Spooner. 



The species of Liburnia were found in fewer numbers over 

 the rest of the pasture but the others were found nowhere 

 else. Perhaps in this case, the increased shade afforded by 

 the trees was responsible for the localized occurrence. 



*Contributions from^the Entomological Laboratories of the University 

 of Illinois, No. 60. 



