Very tiny beetle of Dermestidae 皮蠹科 > 圓皮蠹屬 Anthrenus sp. > 黃帶圓皮蠹 (鰹節蟲)Anthrenus oceanicus. About 5mm in length.

Found 3 of them on the metal mesh.

Reference :
http://www.dermestidae.com/Anthrenusoceanicus.html
http://gaga.biodiv.tw/9702bx/101.htm
http://www.bjliangmao.com/_d271742070.htm