342 



FAMILY CERAMBYCIDAE 



FIG. 230. 



Galleries of young larvae of 



Trinophyllum cribratu >/i 



in bast of deodar. 



b.1. 



These had made little shallow galleries, as 

 shown in fig. 230, on the inner surface of the bark 

 all over the main stem. 



At Konain in Jaunsar again I took numerous 

 partially grown grubs in November 1906 in the 

 tops of green trees felled and converted during 

 the year ; I had never found the beetle in the 

 tree, however. 



The life history of this longicorn beetle was worked out during the 

 years 1908-9 in the Simla Catchment Area Deodar Forest with the aid of 

 Mr. V. Munro, the Divisional Officer; Pundit Gokal Das, Extra Assis- 

 tant Conservator of Forests ; and the Range Officer. This area was 

 visited by a bark-beetle attack (Scolytus and Polygraphus) which began 

 in October 1907. To combat this attack trap trees were felled over 

 the area about 22 May 1908 and a few days subsequently. 



On 9 and 10 August 

 1908 I inspected a number 

 of these trap trees and 

 found them to contain 

 young longicorn grubs. It 

 was therefore obvious that 

 the beetles must have ap- 

 peared on the wing in the 

 forest some time between 

 the commencement of June 

 and the end of July, and 

 oviposited in the felled 

 green trees. 



The trees containing 

 the grubs were kept under 

 surveillance by the Divi- 

 sional Officer and Range 

 Officer during the rest of 

 the year and up to June 

 1909, in which latter month 



pupae and beetles were obtained from them in considerable numbers. 

 We are thus now in possession of the complete life-cycle of the insect. 



I may mention here that the longicorn appears to be often accom- 

 panied by the buprestid Sphenoptera aterrima already described (vide p. 204). 

 The beetle issues from the trees and appears on the wing in the forest 

 in June, pairs, and the female then searches out newly felled trees or sickly 

 standing trees in the forest, and oviposits on them. The eggs are laid 

 singly in crevices in the bark, on the lower part of felled trees, and on the 

 northern or shady sides of standing trees, the number laid by each female 

 being unknown. 



c.i. 



FIG. 231. Trinophyllum crilu-atum, Bates, a, Young 

 larva; b, bi, full-grown, enlarged and natural size; 

 t~, ci, pupa enlarged and natural size. 



