THE EED SPIDEE. ON COTTON. 



41 



SUMMARIES. 



Average daily consumption per nymph 33. 16 



Average daily consumption per adult 28. 88 



Average daily consumption per bug for all individuals 32. 56 



Duration of second nymphal instax 3. 22 



Diu-ation of third njTuphal instar 2. 66 



Duration of fourth nymphal instar 4. 36 



Table IX. — Consumption of red spiders by each instar of Triphlepsinsidiosus, 



Batesburg, S. C. 



Individual 

 No. 



Consump- 

 tion for 

 2d instar. 



Consump- 

 tion for 

 3d instar. 



Consump- 

 tion for 

 4th instar. 



1 

 2 

 3 



4 

 5 

 6 



7 



Average.. 



Mites. 



Mites. 



Mites. 

 120 

 129 

 153 

 136 

 135 

 213 

 136 

















113 

 98 

 125 



65 

 96 



80.5 



112 



146 



Tlie occTirrence of T. insidiosus on mite-infested leaves is recorded 

 from Emporia, Va. ; Raleigh., Chariotte, Greensboro, Wilmington, 

 and Buies, N. C. ; Leesville, Spartanburg, Clemson College, Bates- 

 burg, and other points in South Carolina ; Macon and Savannah, Ga. ; 

 Tallahassee, Fla.; Girard, Ala.; and Meridian, Miss. 



Lygaeidae. 



Geocoris punctipes Say. — This hemipteron has not previously been 

 considered in, literature as a mite predator, Heidemann states that 

 little is known about its life history. Observations at Batesburg 

 are confined to the season of 1914, G. punctipes having been detected 

 during August of that year. Eggs, seen in the midst of red-spider 

 colonies on cotton leaves, were collected for rearing, and immedi- 

 ately upon hatching certain of the nymphs were placed in isolated 

 cells with red spiders and their eggs. It was found that the newly 

 hatched nymphs readily devoured the red spiders as well as some of 

 the eggs. The egg of G. punctipes'ii^ cylindrical and elliptical in shape, 

 fluted, of a pale amber color, and is deposited in the center of the mite 

 colonies. Table X presents the data we have secured on the life 

 history. 



