1. Lower lip, forming the floor of the mouth, often with a pair of palps - labium 2. Simple eye of nymphs and adults - ocellus 3. A toothed or ridged structure used in sound produc... 1. Lower lip, forming the floor of the mouth, often with a pair of palps - labium 2. Simple eye of nymphs and adults - ocellus 3. A toothed or ridged structure used in sound production by stridulation - file 4. Adapted for digging - fossorial 5. Adapted for jumping - saltatorial 6. Aggregation of ommatidia - compound eye 7. An ingrowth of the exoskeleton to which muscles are attached - apodeme 8. Chemical messenger produced in one part of the body and acting in another part - hormone 9. Chemical used in communication between individuals of the same species - pheromone 10. Complete metamorphosis - holometaboly 11. Dorsal plate of the prothorax - pronotum 12. External opening of the tracheal system - spiracle 13. External skeletal structure, secreted by the epidermis, composed of chitin and protein - cuticle 14. Female receptacle for sperm deposited during mating - spermatheca 15. Final stage of moulting when old cuticle is shed - ecdysis 16. Forewing of Hemiptera, with thickened basal section and membranous apical section - hemelytron 17. Glands that secrete ecdysteroids - prothoracic glands 18. Having exposed mouthparts - ectognathy 19. Having two generations in one year - bivoltine 20. Immature form of hemimetabolous insects - nymph 21. Immature form of holometabolous insects - larva 22. Major component of arthropod cuticle; a polysaccharide - chitin 23. Male copulatory organ - aedaegus 24. Modified hind wing in Diptera - haltere 25. Most anterior longitudinal wing vein - costa 26. Multicellular and unjointed cuticular extension, often thorn-like - spine 27. On the upper surface - dorsal 28. Paired endocrine glands associated with the brain, source of JH - corpora allata 29. Part of the insect head to which the labrum is attached anteriorly - clypeus 30. Posterior tagma of insect body - abdomen 31. Pretarsal pad-like or sac-like structure lying between the claws - arolium 32. Production of cold light by an organism - bioluminescence 33. Proximal leg segment - coxa 34. Sense organs that respond to the position of body appendages or organs - proprioceptors 35. Sucking mouthparts - haustellate 36. Unicellular, cuticular extensions - acanthae 37. Unsegmented leg of a larva - proleg 38. Wingless - apterous Read more