APPENDIX 187 



Division III. INSECTA. Tracheates with body divided into 

 head, thorax, and abdomen ; with three pairs of legs and usually 

 two pairs of wings ; insects. 



Order 1. THYSANURA. Minute wingless insects without 

 metamorphosis. Ex. Lepisma. 



Order 2. PSEUDONEUROPTERA. Insects with two pairs of 

 net-veined wings, biting mouth-parts, and incomplete metamor- 

 phosis. Ex. Dragon fly. 



OrderS. ORTHOPTERA. Insects with two pairs of wings, the 

 first pair being usually parchment-like, biting mouth-parts, and 

 incomplete metamorphosis. Ex. Grasshopper. 



Order 4. NEUROPTERA. Insects with two pairs of net-veined 

 wings, biting mouth-parts, and complete metamorphosis. Ex. Ant 

 lion. 



Order 5. COLEOPTERA. Insects with two pairs of wings, of 

 which the first pair are elytra, biting mouth-parts, and complete 

 metamorphosis. Ex. Potato beetle. 



Order 6. HEMIPTERA. Insects with two pairs of wings, or 

 wingless, sucking mouth-parts in form of a jointed proboscis, and 

 incomplete metamorphosis. Ex. Aphis. 



Order 7. LEPIDOPTERA. Insects with two pairs of large 

 wings, sucking mouth-parts in form of a long un jointed proboscis, 

 and complete metamorphosis. Ex. Butterfly. 



Order 8. DIPTERA. Insects with one pair of wings, sucking 

 mouth-parts, and complete metamorphosis. Ex. House fly. 



Order 9. HYMENOPTERA. Insects with two pairs of wings, 

 biting and licking mouth-parts, and complete metamorphosis. Ex. 

 Bee. 



Subtype III. MOLLUSCA. Trochozoans with a soft, unsegmented 

 body without extremities, enclosed usually in a calcareous shell. 



Class I. Lamellibranchiata. Bilaterally symmetrical mollusks, 

 without distinct head, with a bivalve shell and paired mantle 

 cavities. 



Order 1. ASIPHONIA. Lamellibranchs without siphons formed 

 by the fusion of the edges of the mantles. Ex. Anodonta. 



Order 2. SIPHONIATA. Lamellibranchs with siphons formed 

 by the fusion of the mantle edges. Ex. Venus. 



