1 Digitalis medicines control irregular heart rhythms (called arrhythmias) by slowing the signals that start in the sinoatrial (SA) node. 2  This, in turn, reduces the number of signals that travel through the atrioventricular (AV node). 3  Fewer signals mean fewer arrhythmias.
June beetle (genus Phyllophaga), also called May beetle or June bug, genus of nearly 300 species of beetles belonging to the widely distributed plant-eating subfamily Melolonthinae (family Scarabaeidae, order Coleoptera).
By Laura Klappenbach. Fireflies, also known as lightning bugs, glow to lure prey, discourage predators, and most importantly to attract mates. The characteristic green-yellow glow produced by a firefly is the result of a chemical reaction that takes place in the insect's abdomen.irefly larvae are capable of bioluminescence like the adults. For this reason the larvae are sometimes referred to as glow worms. The various species of fireflies belong to the Family Lampyridae, a group of insects that in turn belongs to the Order Coleoptera, the beetles.