Cocoons of E. bauhiniae had a strong silk thread (peduncle) spun to attach the cocoon to the twig of a plant. The peduncle was composed of highly cross-linked fibers embedded with a mass of sericin gum ( Fig. 2). In the rest of the species, cocoons were sessile and were directly attached along their full length to twigs and forked branches. The attachment surfaces for A. mimosae and G. postica were smooth and plastered with massive amount of gum and crystals. G. postica and E. bauhiniae cocoon shells were covered with white rectangular and cubic shaped granular crystalline materials throughout the surface except areas of fiber intrusion ( Fig. 3a and b). FTIR spectra showed the peaks at 1312 cm−1 and 777 cm−1 were attributed to Calcium Oxalate crystal monohydrate (Sigma) ( Fig. 4). However, G. postica cocoons had prominently higher level of the crystals than E. bauhiniae. Inner surface of G. postica had less calcium oxalate crystals. Unlike others, A. mimosae cocoons had considerable amount of holes/perforations formed as a ring like pattern ( Fig. 5). The width of the holes ranged between 448 and 512 μm. However, the number, size, distribution and structure of these holes varied with the position on the cocoon.