Information on cleptoparasite spider density in host Nephila spider webs in oil palm plantation sites in Riau, Indonesia. Column headings include Plot (oil palm area plot number), Treatment (understory management treatment - E is enhanced, N is normal, and R is reduced), Date (date of survey), Time (time of survey), Weather (weather at time of survey), Spider Height (height of spider in web), Spider size (length of Nephila spider), Web L (total length of web), Web W (total width of web), # cleptos (number of Argyrodes spiders in web), # males (number of male Nephila spiders in web).