Cerambycidae, Lamiinae, Monochamini, Macrochenus sp., could be Macrochenus isabellinus. I might see some reddish on the elytrae. But there are other ones in Sri Lanka, like Macrochenus tigrinus.
http://papilio.arimos.org/photo/photo_affiche.php?img=./insectes/coleopteres/cerambycidae/Macrochenus%20tigrinus.jpg&nom=Macrochenus%20tigrinus
http://www.nbaii.res.in/insectpests/Macrochenus-isabellinus.php
http://www.insecte.org/forum/viewtopic.php?f=1&t=73704
http://www.galerie-insecte.org/galerie/ref-72499.htm
http://www.cerambycoidea.com/forum/pop_printer_friendly.asp?TOPIC_ID=14867
http://www.thebugmaniac.com/index.cfm/page:shop/shopcategory:147/shopproduct:9082
https://apps2.cdfa.ca.gov/publicApps/plant/bycidDB/wdetails.asp?id=32616&w=o
https://apps2.cdfa.ca.gov/publicApps/plant/bycidDB/wthumb.asp?g=Macrochenus&w=o
http://insectavaria.com/macrochenus-isabellinus.html
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