Direct flight muscles are only associated with the downstroke of an insect's wing. The cement layer of an insect's exoskeleton strengthens its procuticle.
Frontal sutures separate the frons from the genae.
A. Epiproct C. Aedeagus B. Paraproct D. Furca 7. A. Lipid C. Sugar B. Quinone D. Amino Acid 8. A. Mesothorax C. Prothorax B. First abdominal D. Metathorax 9. A. Labium C. Cibarium B. Labrum D. Hypopharynx 10. A. Trochanter C. Furca B. Empodium D. All of these 11.