660 



PEOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



No. 38. — Nagoda nigricans, Mo. (Mikan-Iraga.) 

 This Limacodid moth usually appears in the winter time, through - 

 oufr the Island of Formosa, and the eggs are probably laid on the surface 

 of the leaf, about four or five at a time. - 



The young caterpillar lives on the leaf-surface, and eats its epidermis 

 and chlorophyll, leaving the lower epidermis, but soon after it feeds 

 on the leaf from the top-margin or lateral margin, as other Limacodidse. 

 The growth of the larva is very slow, as the duration of the larval stage 

 is about 120 days ; after that it begins to form a white spherical cocoon 

 between two leaves and turns to the brown pupa. This cocoon measures 

 about 7-5 mm. (male) or 13 mm. (female) in length or about 6 mm. 

 (male) or 10 mm. (female) in width. Specimens kept in captivity 

 remained as cocoons for about 230 days throughout the summer season. 

 The pest has only one generation in a year. The actual data of the 

 breeding m the laboratory in Taihoku are shown in the followmg 

 table : — 



The full-grown caterpillar is eUiptical and strongly convex back- 

 wards, without distinct segmentations. This greenish larva is smooth,, 

 with five pale whitish stripes and between each stripe there is one wavy 

 white stripe (six in total) throughout the whole length. The venter 

 is pale yellowish-green, with three pairs of tiny conical legs which bear 

 a bro^Ti hook and two spines on each apex. The head hides under the 

 first somite and the mouthparts often protrude forwards. The spiracles 

 are pale yellowish-white ; the first somite is well-developed and is pale 

 blue. It measures about 15 — 18 mm. in length. 



This pest is almost always neglected by the natives but the damage 

 done is rarely serious to the tea-bush although it is a rather minor pest 

 of the orange-tree. The destruction of the caterpillars in December 

 and the collection of the cocoons in the summer season form the most 

 reasonable remedy. 



No. o9.—Narosa nitohei, Shir. {Kcnashi-Skiro-Iramushiga.) 

 This species is not commonly found throughout the Island, but its 

 occurrence is restricted to the upper half of the island according to our 

 investigations, and the moth appears from March to May or from 

 October to December. 



