Beetles, order Coleoptera, are the largest family in number, about 40%. Its first pair of wings have hardened and turned into sheaths which can protect its body; its back wings help to fly, and look like sword sheaths Hercules beetles, Lucanidaes, Anomala expansa, sawyer beetles and the frequently-seen firebug, luciola gorhami ritsema, as well as other firebugs, are members of this family. Plenty of beetles are often seen under the road lamps on the circular roads at night.
Common Names：Dou Chong, Lu Jiao Gui, Bai Ji You Gui.
Distribution：In the mountains from plains to altitudes of 2000 meters.
Shape and Features：The adults appearing from May to October, mostly appear from May to July. The male bug has a big forked protuberance on its head and a small protuberance on its pronotum. It is 4 to 6.2 centimeters, not including the protuberance; its color ranges from red-brown to deep black. The female bug doesn't have a protruded horn that looks like a big dorbeetle.
Habitual Behavior：Its larva lives on humus, eating humus or rotten wood as food; it can grow up to about 7 to 9 centimeters, looking like a larva of dorbeetles. The adult eats sap or fully matured fruits. Its ecological role is a "cleaner". We can easily find the adult bugs under the streetlamps in circular road in summer.
Common Names：Double-spotted red spade-shaped bug
Distribution：In medium-elevation mountains, there are a great number in quantity.
Shapes and Features：There are 12 very distinct red spots, forming the most eye-catching feature. Males vary greatly in sizes; the maximum could reach 7 centimeters and the minimum is only 2 centimeters. The larger it is, the more odontoid processes on its mandible it has got, and are therefore more attractive. Most spade-shaped bugs are grayish brown, but this species is different because its main color is a bright juniper- patterned.
Habitual Behavior：It has a strong phototaxis and often flies into civilian houses; its number of colonies is only second to Serrognathus platymelus sika.
Distribution：In plains and in low to medium-elevation mountains.
Shapes and Features：Body length is about 2 to 5 centimeters, and its as brightly red as red coral, belonging to medium to small-scaled long-homed beetles. Among the brightly red long-homed beetles in Taiwan, it is the most outstanding. The male has a long antennae which can be 3 times longer than its body length; the female's is only as long as its body length at most.
Habitual Behavior：It's the representative beautiful long-homed beetle of central Taiwan. Because litchis are widely planted in the low-elevation mountains of central Taiwan, it makes it greatly bred. It feeds on rotten branches of litchis and plays the role as a cleaner in the ecosystem, so it doesn't do great damage to the farmers, crops, but it is often mistaken as a destructive insect and thus killed in great numbers. Its life period is about 1 year and the adult can be seen from March to September.
Common Names：Huo Jin Gu, flame bug.
Distribution：Appears from April to June. Found in low to medium-elevation mountains without light pollution.
Shapes and Features：Head and elytra are black, pronotum orange. Male's photophores are the fifth and sixth ventral metameres while in females it is the fifth.
Habitual Behavior： Each year from April to May, there are a great number of fireflies that appear in mountains near Sun Moon Lake. Sometimes there are even hundreds of thousands of fireflies flying all over the valleys. Most of them that are seen this time of year are Luciola cerata.