LINNEAN SYSTEM.— INSECTS. 161 
** Antenne filiform. 
Bruchus. Antenne filiform, thickened at the end. 
Cassida. Body ovate; elytra margined, head covered by a 
shield. 
Ptinus. Thorax receiving the head. Antennz with the last 
joint lengthened. 
Chrysomela. Body ovate, immarginate. 
Hispa. Antenne porrect, approximate, fuciform. 
Meloe. Thorax roundish, head gibbous, inflexed. 
Tenebrio. Thorax margined ; head exserted ; hody oblong. 
Lampyris. Elytra flexible. Thorax surrounding and con- 
cealing the head. 
Mordella. Abdomen with plates at its base ; head inflexed. 
Staphylinus. Elytra very small, covering the wings ; above 
the tail two exsertile vesicles. 
*** Antenne setaceous. 
Cerambyx. Thorax with hard spines on the sides. 
Leptura. Elytra with the tips narrowed. Thorax roundish. 
Cantharis. Elytra flexible; sides of the body plaited and 
warty. 
Elater. A pectoral spine, springing from an abdominal pore. 
Cicindela. Jaws projecting, toothed. Eyes prominent. 
Buprestis. Head partly retracted within the thorax. 
Dytiscus. Posterior feet fringed, and formed for swimming. 
Carabus. Thorax somewhat heart-shaped; truncated behind. 
Necydalis. Elytra shortened; wings naked. 
Forficula. Elytra short, wings covered, tail forcipated. 
II. Hemirrera. Elytra semi-crustaceous. 
Blatta. Mouth furnished with jaws, wings coriaceous, flat, 
legs formed for running. 
Mantis. Mouth furnished with jaws. Anterior feet serrated, 
the claw single. 
Gryllus. Mouth furnished with jaws: posterior feet formed 
for leaping. 
Fulgora. Rostrum or sneut inflexed, front projecting, in- 
flated, and capitate. 
Cicada. Snout inflexed; hind legs formed for leaping. 
Notonecta. Snout inflexed; hind legs fringed, and formed 
for swimming. 
Nepa. Snout inflexed; fore legs cheliform. 
Cimex. Snout inflexed; legs formed for running. Antenne 
longer than the thorax. 
Aphis. Snout inflexed ; body terminated by two bristles. 
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