PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 651 



summer months, the moths emerge in four to six days after pupation, 

 and in the -vs-inter in from ten to seventeen days. The moths are well 

 attracted by light. The larvae almost always pass through four moults 

 before becoming full-grown, but rarely five. The caterpillars complete 

 their development in from 17 to 30 days, each instar occupying from 

 two. to nine days. The whole life-cycle occupies from 30 days to 70 

 days, depending on the time of year. 



I have no records that tea bushes have been seriously attacked by 

 this pest during the last ten years. The recommended remedy is the 

 collection and destruction of the young caterpillars or pupse. 



No. 30. — Orgyia 'postica, Walk. {Koshiromon-Dohiga.) 



This species is commonly found throughout the whole year in 

 Formosa, but its attack on tea-plants is not very serious as it rarely 

 appears abundantly on the bushes. It has been noticed that the food- 

 plants of this caterpillar are Cruciferae, Sfinacea oleracera, potato, 

 egg-plant, Gordonia anomala, tea, cotton, grape-vine, Sapium sebiferum, 

 Ricinus communis, rose, orange, peach, Prunus mume, Pmnus communis, 

 pear, Eriohotrya japonica, Bcehmena nivea; mulberry, Ficus carica, 

 and other several plants. 



The eggs are spherical, with the upper side shghtly flat, and on the 

 upper surface there is an inconspicuous pale brownish ring, but the 

 rest of the surface is quite smooth. The eggs are white and are 0-7 mm. 

 in diameter. They are almost always laid on the cocoon of the female, 

 in very irregular masses ; they hatch in from seven days to twelve 

 days after deposition. 



The larva is brownish-yellow with a reddish-brown head and 

 yellowish-brown legs ; the first somite bears a long dull blackish tuft 

 projecting forwards on each side near the anterior margin, a similar 

 but paler tuft on each dorsal somite (11th and 12th somites) ; four 

 very compact whitish-yellow tufts on the back of the first to fourth 

 abdominal somites, while on each side of the first and second abdominal 

 somites there is a similar but A^ery narrow tuft ; the tubercles on each 

 somite are eight and bear sparse yellowish bristly hairs except on the 

 tubercles covered with the tufts mentioned already ; the sixth and 

 seventh abdominal somites have another conspicuous tubercle which 

 is deep red and is placed between the dorsal tubercles ; the subdorsal 

 and lateral stripes are j)aler but rather conspicuous, and the venter is 

 still paler. The duration of the larval stage is 25 — 55 days. The full- 

 grown larva measures 30 — 35 mm. long. 



