Elmomorphus siamensis is a species of beetle of the Dryopidae family. This species is found in Cambodia, Laos, Myanmar, Thailand and Vietnam.
Adults reach a length of 2.73âÂÂ3.20 mm (males) and 2.78âÂÂ3.25 mm (females). Their body is ovate and black, except for reddish brown mouthparts, antennae, trochanters, and tarsi.
The species name is Latin and refers to Siam, the former name of Thailand.