13 Hemiptera True Bugs 2 pairs of wings that are not alike. 1st pair is membranous and horny.2nd pair is membranous.Sucking mouth parts.
14 Odonata Dragonflies and Damselflies 2 pairs of long membranous wings. Wings are similar in size and shape.Chewing mouth parts.
15 Mecoptera Scorpionflies 2 pairs of similar membranous wings Chewing mouth parts
16 Hymenoptera Bees, wasps, and ants 2 pairs of membranous wings with reduced veinationChewing or chewing and sucking mouth partsFemale has sawlike or peircing ovipositor or a stingerMany live together in colonies
17 Plecoptera Stone flies Have 2 pairs of membranous wings 1st pair is long2nd pair is larger and folded in pleatsChewing mouth partsCerci
18 Coleoptera Beetles 2 pairs of unlike wings Chewing mouth parts 1st pair meets in a straight line down the back2nd pair is membranous and folded under the front wingsChewing mouth partsNo cerci
19 Orthoptera Grasshoppers and crickets 2 pairs of unlike wings 1st pair is long and thick2nd pair is membranous, triangular and folded in pleatsChewing mouth partscerci
20 Dermaptera Earwigs 2 pairs of unlike wings 1st pair meets in a line down the back2nd pair is membranous with radiating veins and is folded lengthwise and crosswiseChewing mouth partsForcep-like cerci
21 Thysanura Silverfish Wingless Chewing mouth parts 11 abdominal segmentsUsually have long cerci
22 Review of Dichotomous Keys A dichotemous key is a guide for identification based on a series of steps with “yes” or “no” answers.The answer at each step guides the user to the next appropriate step.