CONTENTS vii 



A, Air-breathing Arthropods (Tracheata). 



Page 



Class i. INSECTS (Insecta) - - 343 

 Structure and Development of the Cockroach (Periplaneta orientalis), taken 



as a Type - 343 



Order i. BUGS (Hemiptera) - - 351 



(1) Homoptera (Cicadas, Lantern-Flies, Frog-Hoppers, Plant-Lice). 



(2) Heteroptera (Land-Bugs, Water-Bugs). 



Order 2. FRINGE-WINGED INSECTS (Thysanoptera) - - 355 

 Corn Thrips (Thrips cerealium). 



Order 3. FLIES AND FLEAS (Diptera) - - - 355 



Order 4. MOTHS AND BUTTERFLIES (Lepidoptera) - - 358 



Order 5. BEETLES (Coleoptera) - - - 366 



Order 6. MEMBRANE-WINGED INSECTS (Hymenoptera) - 369 



Order 7. NET-WINGED INSECTS (Neuroptera) ... . 374 



Order 8. STRAIGHT-WINGED INSECTS (Orthoptera) - - 380 



Order 9. WINGLESS INSECTS (Aptera) - - 384 



Class 2. SPIDER-LIKE ANIMALS (Arachnida) 385 



Structure of a Scorpion, taken as a Type - ... 385 



Order i. SCORPIONS (Scorpionidae) - 387 



Order 2. FALSE SPIDERS (Solpugidas) - - 387 



Order 3. FALSE SCORPIONS (Pseudoscorpionidae) - 388 



Order 4. WHIP-SCORPIONS (Pedipalpi) - 389 



Order 5. HARVESTMEN (Phalangidas) 390 



Order 6. SPIDERS (Araneidae) - 390 



Order 7. MITES (Acarina) - 393 



Order 8. TONGUE-WORMS (Linguatulidae) - 393 



Order 9. BEAR-ANIMALCULES (Tardigrada) - - 394 



Class 3. CENTIPEDES AND MILLIPEDES (Myriapoda) . . . 394 



Class 4. PRIMITIVE TRACHEATES (Prototracheata) 398 

 Structure and affinities of Peripatus. 



B, Aquatic Arthropods (Branchiata). 



Class 5. CRUSTACEANS (Crustacea) 402 



Structure of the Lobster (Homarus vulgaris), taken as a Type - 402 



Sub-Class I. HIGHER CRUSTACEA (Malacostraca) - 410 



Order i. STALK-EYED CRUSTACEA (Thoracostraca) -.'- - 410 

 (i) Ten-legged Crustacea (Decapoda) (Lobsters, Prawns, Shrimps, Cray- 

 fishes, Hermit-Crabs, Crabs) (2) Opossum-Shrimps (Schizopoda) 

 (3) Locust-Shrimps (Stomatopoda) (4) Cumacea. 



Order 2. SESSILE-EYED CRUSTACEA (Arthrostraca) - - - 414 

 (i) Amphipods (Sand-Hoppers, Whale-Lice, Skeleton Shrimps) (2) Isopods 



(Slaters, Wood-Lice). 



Order 3. INTERMEDIATE CRUSTACEA (Leptostraca) Mud-Shrimps - - 416 



Sub-Class II. LOWER CRUSTACEA (Entomostraca) ------ 416 



