642 PROCEEDINGS OF THE THIRD EIs^TOMOLOGICAL MEETING 



are well-developed and are blackish brown, bearing a claw on eacb one ; 

 prolegs and anal legs grow a little and are like short protuberances. 

 The length of the full-grown larvae : the male is about 25 mm.; the 

 female is about 40 mm. 



The pupae of the females are cylindrical in shape, with both ends 

 narrowed towards the extremities, and are shining reddish brown ; 

 on the anal end there are three fine spines. They measure about 30 mm. 

 long. In the male they are purplish black : the head is slightly produced 

 forwards : wing-sheaths are short, leachmg the posterior margin of 

 the second abdominal segment : the abdomen is paler and rather tapers 

 to the anal end, bearing many fine irregular transverse carinse which 

 do not appear at the posterior border of each segment : each dorsal 

 segment of the abdomen near the anterior margin, bears a row of 

 many small spine-like tubercles ; the anal segment is somewhat conical 

 n shape, bearing two rather large hooks at the apical extremity. The 

 length is about 19 mm. 



The duration of the larval stage is about from nine to ten months, 

 after which the larvae turn to pupse. The moth emerges m about 

 30 — 40 days.- The whole life-cycle occupies about a year ; thus there 

 is only one occurrence in a year, and I have never found that this insect 

 appears twice in a year although the male moth or female adult is 

 found in several months. 



The food plants observed in Formosa are as follows : Acacia sp., 

 tea, camphor, cotton, grape, vine, orange, pear, Bischoffia javanica, rose, 

 Eriobotrya japonica, Psidium Guyava, Eugenia jamhos, Eugenia 

 malaccensis and mulberry. 



The effective remedy is hand-picking of the caterpillars or pup» 

 or the females living in the cases during the winter time. Two Tachi- 

 nidse and one Ichneumonid have been reared from the pupae, and their 

 destructiveness is rather conspicuous in Formosa. 



No. 22. — Clania destructor, Dudg. [Taiivan-Cha-Minoga.) 

 This species is also rather common throughout the island of Formosa. 

 I have formerly mis-identified it as minuscula, Butl., but it is easily 

 distinguished from the latter by its large size, and by the two greyish 

 median stripes on the thorax, as well as by the more blackish colouring. 

 This insect usually attacks the tea-plant and Psidium Guyava, and the 

 former is often seriously damaged by it, in February to May, so that 

 no crops can be plucked from a small area of a particular district. 



The caterpillar is yellowish brown, with the head pale yellowish 

 ornamented with many small irregular blackish brown flecks, and 

 bearing a few hairs ; the first thoracic somite in colour is similar to the 



