248 



ANNELIDA AND ARTHROPODA: 



Kgure 14.25 Hemiptera: 1, Gerridae, a water strider {x 2); 2, Corixidae, o water boatman 

 {x 3); 3, Naucoridae, a creeping water bug (x 1); 4, Gelastocoridoe, a toad bug {x 3); 5, Antho- 

 coridae, a flower bug {x 7); 6, Cimicidae, a bedbug (x 6); 7, Nepidae, a woter scorpion (x '2); 

 8, Notonectidae, a back swimmer (x 3); 9, Aradidae, a flat or fungus bug (x 3); 10, Lygoeidae, a 

 cinch bug {x 1); 11, Miridae, a leaf bug (x 2); 12, Coreidoe, a squash bug (x 1 ' o); 13, Nepi- 

 dae, a water scorpion (x 1); 14, Hydrometrldae, a water measurer or marsh treoder (x 2' 2); 15, 

 Nabidae, a damsel bug {x 4); 16, Scutelleridae, a shield bug (x 3); 17, Pentatomidoe, a stink bug 

 (x 2); 18, Neididae, a stilt bug (x I'j); 19, Belostomatidae, a giant water bug (x ' -j); 20, Phy- 

 matidae, an ambush bug (x 3); 21, Reduviidae, an assassin bug (x 1 ' 2); 22, Tingididoe, a lace bug 

 (x 7). (After various sources.) 



ORDER MECOPTERA (Scorpion Flies) 



Diagnosis: small to large, most to one inch long; 

 four slender, membranous, many-veined wings, roof 

 abdomen at rest; chewing mouth parts on a down- 

 ward-extending beak; some males curve the abdomen 

 end upward, scorpion-like; inhabit plants and are 

 scavengers, herbivores, or carnivores; some are found 

 in snow (Figure 14.28). 



ORDER TRICHOPTERA (Caddisflies) 



Diagnosis: small to moderate, to one inch long; 

 four membranous, mostly longitudinally veined 

 wings, roof abdomen at rest; body and wings haired, 

 sometimes scale-like; mouth parts vestigial; larvae 

 fresh-water, often in rapid water, usually casemaking 

 and clinging to underside of rocks; case of sand, 

 debris, or plant matter; larvae are scavengers or 



