Studies on the biology, food consumption of larvae and parasitization of L. (Parasa) viridissima Holl. were conducted in the laboratory and field. L. viridissima has 6 larval instars. On average, the egg stage lasted 7.3, the larval stages 54.8 and the pupal stage 32.9 days. The mean developmental period from egg to adult was 95 days. The mean weight of leaf tissues consumed by all instars of a single larvae was 4.7 g; 34% of this amount was eaten during the 6th instar and about 2% in the first 2 instars. The egg and the 1st instar larvae were not parasitized, but other larval instars and the pupae were attacked by a total of 8 parasites belonging to the 7 families Bombyliidae (Systropus pelopoeus), Braconidae (Apanteles sp., Rogas sp.), Chalcididae (Brachymeria sp.), Chrysididae (Chrysis (= Praestochrysis) spina), Eulophidae (Tetrastichus sp. near balteatus), Ichneumonidae (Coccygodes coccyx), and Tachinidae (Palexorista sp. near mayneana). Larvae attacked by microorganisms were identified by their change in body color, usually from green to black or yellow, and liquification of internal body organs. Microbiological tests of the tissues of infected larval revealed the presence of a bacterium, Bacillus sp. and a fungus, Aspergillus sp. [Coccygodes coccyx is probably a lapse of an unknown ichneumonid.] none