264 INTRODUCTION TO ZOOLOGY chap. 



mother tunnel, as shown in the diagram. In the enlargement 

 at the end of each secondary tunnel one larva pupates. It 

 emerges as a fully developed beetle the following sjiring, 

 leaving the tree by a fresh tunnel vrhich it makes through the 

 bark. 



General Classification of Beetles mentioned in Chapter XVII. 



Order. Coleoptera. 



Sub-order 1. — Adephaga. Predatory beetles with thread-like 

 antennae, larvae active and predatory. 

 Family 1. Dytiscidae. 



Dyticus (or Dytiscus), the Carnivorous Water 



Beetle. 

 Acilius. 



Ilybiun, the " Mud-dweller." 

 Family 2. Pelobiidae. The Screech Beetles. 

 Family 3. Cicindelidae. The Tiger Beetles. 

 Family 4. Carabidae. The Ground Beetles. 

 Sub -order 2. — Clavicomia. Antennae usually thicker at the 

 tip, though the thickening may be slight. 

 Family 1. Coccinellidae. Ladybirds. 

 Family 2. Staphylinidae. Cock-tail Beetles. 

 Family 3. Hydrophilidae. Silver Water Beetles. 

 Family 4. Gyrinidae. Whirligig Beetles. 

 Sub-order 3. — Serricomia. Antennae usually serrate — not a 

 very coherent sub-order. 

 J^mily 1. Elateridae. Click Beetles. 

 Family 2. Lampyrides. Glow-worm Beetles. 

 Family 3. Ptinides. Furniture Beetles. 

 Sub-order 4.^Lamellicomia. The antennae have tbeir last 

 joints enlarged to form horizontal leaf-like 

 parts. 

 Family 1. MelolonMiides. Cockchafers. 

 Family 2. Lucanidae. Stag Beetles. 

 Sub -order 5. — Rhynchophora (The Snout Beetles). The head 

 is prolonged infront to form a beak or "snout." 

 Family 1. Curculionidae. Weevils. 

 Family 2. Scolytidae. The Bark Beetles. 



Practical Notes 



1. Get male and female specimens of Dyticus marginalis and 

 keep them alone in a fairly large fresh-water tank with plenty of 



