Arthropods as predators

p. 105: "Some predatory mycetophilid larvae secrete droplets ox oxalic acid at a concentration of 0.15 per cent, with a pH of 1.8, which are deposited on the silken threads of their traps, where they rapidly immobilaze entangled prey... Similar web traps with beads of unknown compositionare produced by the larvaeof another mycetophilid, Arachnocampa luminosa, in New Zealand, whose luminiscent organ is said to attract prey to the dangling adhesive lines."