December, '14] 



EWING: COCCINELLID STATISTICS 



441 



damia spuria Leconte, 25; Hippodamia convergens Guer., 116; Cocci- 

 nella trifasciata Cr., 12; Coccinella transversoguttata 1; Cycloneda 

 sanguinea Linn., 53; Adalia hipunctata Linn., 2. 



On August 19, 1913, collections were made of all the coccinellids 

 found feeding on many thistles, upon Aphis viburni Scop. The total 

 number of beetles found was 276. These were distributed as follows: 

 Hippodamia spuria Leconte, 17; Hippodamia convergens Guer., 241; 

 Hippodamia parenthesis '$>2iy, 2; Coccinella 9-notata Wo^i., 7; Coccinella 

 trifasciata Cr., 9. 



On August 20, 1913, a large number of weeds, lamb's quarters, were 

 examined and all adult lady-birds were collected. They were feeding 

 on Aphis viburni Scop. In all 988 beetles were gathered. They be- 

 longed to six species, and in the following numbers: Hippodamia 

 spuria Leconte, 30; Hippodamia convergens Guer., 913; Hippodamia 

 parenthesis Saj', 6; Coccinella 9-notata Hbst., 26.; Coccinella trans- 

 versoguttata Fald., 1; Cycloneda sanguinea Linn., 12. 



In a kale patch feeding on Aphis hrassicoi Linn., we collected 344 

 adult lady-birds. These represented all that were found on four 

 rows of kale. The collections were made August 21, 1913. These 

 different individuals were distributed among four species as follows: 

 Hippodamia spuria Leconte, 28; Hippodamia convergens Guer., 314; 

 Hippodamia parenthesis Say, 1; Coccinella 9-notata Hbst., 1. 



Table Showing the Relative Abundance of the Different Species of Coccinellids for Five Different 

 Situations in Percentage Terms of the Total Population Present 



The collections from the vetch fields were made June 4, 1913. We 

 selected a strip of luxuriant vetch 240 feet long and six feet wide, and 



