340 FAMILY CERAMBYCIDAE 



Beetle. Reddish brown to dark brown in colour ; scantily clothed with greyish depressed 

 pubescence interspersed with moderately long sub-erect tawny setae. Head densely punctate, 



marked above with a feeble median groove which extends anteriorly 

 Description. between the antennal supports. Prothorax 



densely rugulose - punctate. somewhat 



sparsely asperate at sides ; the disk with a postero-median and two 

 nearly obsolete anterior callosities. Elytra densely punctate, the 

 punctures somewhat unequal in size, rather strong on the anterior 

 half and gradually smaller towards the apex ; each elytron with one 

 or two feebly raised longitudinal lines. Abdomen very sparsely 

 punctate. Length, 9 mm. to 16 mm. ; breadth, 2j mm. to 4$ mm. 



I took a specimen of this insect from its pupating- 



chamber in the sapwood of a re- Gelonatha hirta, 



Life History. cently felled green teak-tree on Fairm. x 2. Tenasserim. 



7 March 1905. The larvae feed in 



the bast and sapwood, eating out rather narrow winding galleries blocked 

 with wood-dust. When full-fed they bore about half an inch into the sap- 

 wood, and then eat out there an elongate narrow chamber parallel to the 

 long axis of the tree. The beetles evidently fly early in March. It is 

 possible that there are two generations of the insect in the year. 



The Geloncetha accompanies Xylotrechus smei (p. 347) in its attacks on 

 the teak-tree in Tenasserim. 



Mr. W. H. A. Watson found the insect in teak in the Southern Shan 

 States in 1910. He wrote : " I notice that, after girdling, teak-trees in this 

 division are extensively attacked by a beetle. The main period of attack 

 appears to be the first eighteen months after girdling . . ." This is a most 

 interesting observation. Although the insect does no damage of any im- 

 portance to old trees, since it only goes into the outer sapwood to pupate,, 

 its increase in any large numbers, owing to the provision of the necessary 

 breeding places in the newly girdled trees, may have the most serious effects 

 on young teak areas in the future. The larva is a bast feeder, and quite 

 capable, when in numbers, of killing pole growth. 



TRINOPHYLLUM. 



Only one Indian species is known. It is probably one of the most 

 serious pests of the deodar. 



Trinophyllum cribratum, Bates. 

 (The Deodar Longicorn Bast-eater.) 



REFERENCES. Bates, P.Z.S. 1878, p. 720; id. Scientific Results Second Yarkand Mission, Col. p. 22, pi. i, 



fig. 19 (1890) ; Gahan, F.B.I. Ceramb. p. 156, no. 162. 



Habitat. The beetle is probably to be found throughout the entire area 

 occupied by the deodar in the Western Himalaya. 



Gahan in the Fauna gives Murree; Kashmir; Assam; Sylhet a somewhat 

 curious distribution. This is the only species of the genus given in the Fauna* 



Tree Attacked. Deodar (Cedrus deodara). Deodar tracts, North-West 

 Himalaya. 



