FA M I L Y S C O L YT I D A E 



599 



with a very tine low of small punctures down them ; declivity only moderately al)rupt, striatc- 

 punctate, with a moderately dense covering;- of spiny setae, which are also present on disk and 

 sides of elytra and on prothorax anteiiorly. Undersurface lii,dit in colour, punctate, with 

 a few sparse spiny setae. Leys brown, til)iae with four teeth on outer edi,^' anteriorly 

 and a terminal hook. Len,yth, 2 mm. to 2.5 mm. 



This insect is one of the common pin-hole borers of teak in Madras. 



I took the insect riddhng teak poles in Nilumbur in 



Life History. August 1902, and saw the results of its work on other 



occasions in these forests. The female appeared to 



drive tunnels into hard timber, laying her eggs at the bottom of the tunnel. 



Three years later I was able to make some further observations in 

 Tenasserim on this insect, which is new to science. 



A generation of beetles just mature and leaving a Dalbcr<^ia cidtvata 



tree was taken on Kowloon Island, Salween River, on the loth of March 



1905. The insect evidently oviposits in nearly dead and newly dead trees. 



To oviposit the beetle tunnels down through the bark till it reaches the 



sapwood. On the outer surface of this latter a short transverse gallery 



about an inch in length is eaten out (fig. 381, b, c), and the female 



beetle is probably fertilized by the 



male here. From somewhere in this 



galler}' the female beetle tunnels down 



into the wood, the tunnel curving at 



first and then going straight down 



into the wood for four to five inches {d). 



In several cases two holes took off 



from the transverse gallery, and 



the male may pair with more than 



one female. From the long tunnels 



in the wood I took two, three, and as 



many as four mattire beetles which 



~ were ob\iously just inature and ready 



, ^ ^ to leave the tree. The eggs are evi- 



Lgg-tunnel of Xyleborus noxiiis. Samps., , . 1 1 • 1 , , 1 ^ . . r , 1 ^ i 



\r. *\.^ ,r.r.A,.(r, 11 ^^ If 4 II dc H 1 1 v 1 a 1 d a t t h c bo 1 1 om ot t hc t u u u cl 



in the wood ot Dalvers^ta cult) aia. a, bark ; -' 



b, c, transverse gallery in outer sapwood; by the female beetle, at least four eggs 

 d, egg-gallery. .Salween River, Tenasserim. being laid in each tunnel. 



^ Trrr' 



^^ 



jCEE 



The infested tree examined was a large newly dead girdled standing 

 yindiak, a large part of the lower portion of whose trunk was literally 

 pitted with the entrance-holes of the insect. The attack in question was 

 evidenth' just over, and the wood too dry for further attack, as I found 

 none of the issuing generation of beetles tunnelling into the wood to oviposit. 



This is also one of the pyinkadu scolytid wood-borers. I took this 

 Xyleborus numerously in March in a large tree which had been felled 

 in a clearing at Kamamaung, Salween River, some four to six weeks 



