Ground beetle larva

Possibly the larva of Physodera eschscholtzii. melvynyeo.deviantart.com/art/G…

Taken at night in Singapore.

Quote from en.wikipedia.org/wiki/Ground_b…
As predators of invertebrates, including many pests, most ground beetles are considered beneficial organisms. The caterpillar hunters (Calosoma) are famous for their habit of devouring prey in quantity, eagerly feeding on tussock moth (Lymantriidae) caterpillars, processionary caterpillars (Thaumetopoeidae) and woolly worms (Arctiidae), which due to their urticating hairs are avoided by most insectivores. Large numbers of the forest caterpillar hunter (C. sycophanta), native to Europe, were shipped to New England for biological control of the gypsy moth (Lymantria dispar) as early as 1905.

A few species are nuisance pests. Zabrus is one of the few herbivorous ground beetle genera, and on rare occasions Zabrus tenebrioides, for example, occurs abundantly enough to cause some damage to grain crops. Large species, usually Carabinae, can become a nuisance if present in numbers, particularly during outdoor activities such as camping; they void their defensive secretions when threatened, and in hiding among provisions their presence may spoil food. Since ground beetles are generally reluctant or even unable to fly, mechanically blocking their potential routes of entry is usually easy. The use of insecticides specifically for Carabid intrusion may lead to unfortunate side effects, such as the release of their repugnatorial secretions, so it generally is not a good idea unless the same applications are intended to exclude ants, parasites or other crawling pests.