FAMILY CERAMBYCIDAE 



351 



accompanied by the bark-borer Dryocoetes hewetti (p. 545), it must be 

 looked upon as a serious pest. 



Remedial measures in the forest for these longicorn beetle pests are 

 somewhat difficult to prescribe, as the insects are 



Protection and Remedies normally distributed throughout the area occupied 

 against the Oak Longi- , 



corn Borers. by the tree. A point, however, which should always 



be borne in mind is that the egg is deposited by the 



beetles on the bark of green standing sickly trees or newly felled ones, and 

 that the young grub requires at first the soft bast layer to feed upon. 

 Consequently barking the trees soon after felling will ensure the destruc- 

 tion of the Xylotrechus beetles, since their grubs spend the whole of the 

 period of their existence in this stage in the bast layer and outer sap- 

 wood. The barking of the trees leads to the drying up of the bark and 

 the death of the grubs. Trees infested by the parasitic Loranthus vestitus are 

 most liable to be attacked by this beetle. 



Xylotrechus quadripes, Chevr. 



(The White-Borer or Coffee-Borer.} 



REFERENCES. Chevr. Mem. Soc. R. Sci. de Liege, xviii, p. 315 (1863) ; Dunning, Trans. Ent. Soc. 1868, 

 p. 126 and fig.; Ind. Mus. Notes, i, 61 ; Gahan, F.B.I. Ceramb. i, no. 276, p. 245 (1906). 



Habitat. Mysore, Coorg, South Kanara. 

 Assam, Sylhet, Burma, Siam, Tonkin. 



Tree Attacked. The Coffee (Coffea 

 arabica). 



Gahan gives Madras, Coorg, 



i 



Beetle. Black with a greyish or yellowish 

 pubescence covering the greater part of the head 



and prothorax and form- 

 Description, ing bands on the elytra ; 

 disk of prothorax with a 



rounded subasperate black spot in the middle, 

 and a smaller black spot at each side. The elytra! 

 bands consist of the following : (i) a basal band ; 

 (2) a short oblique band that points towards the 

 shoulder in one direction, and towards the angle 

 of the next band in the other ; (3) a band which 

 begins a little behind the scutcllum, runs close by 

 the suture for a short distance, then diverges from 

 it posteriorly and turns outwards to the side ; (4) a 



transverse or slightly oblique band behind the middle which gradually widens towards the 

 suture; (5) an apical band with oblique front margin. Mod) Ix-neath with a dense white- 

 pubescence formed into spots in parts. 



$ Face witli a more or less distinct median carina. between ulndi and cadi of the 

 lateral carinae there is an elongated, very finely nigulosc, opaque black area, witli slightly 

 raised edges. Head femora extending beyond the apex of elytra. $ Face, with a single 

 raised line orcarina on each side midway between the median and lateral carinae. Mind femora 

 not reaching past the apex of elytra. Length, 10 mm. to 17 mm. ; breadth, 3 mm. to 5 mm. 



Larva. Yellowish white, stout and thick, tapering but slightly. Has the ordinary longicorn 

 appearance, and is about one inch in length. Is a fairly active grub. 



Fio. 238. XylotrecliHs t/nii<tri / 

 Chevr. J. Madras. (F.H.I.) 



