+--------------------------------------------------------------+ | | | EXPLANATION OF PLATE XXXVI | | | | 1. _Meganostoma eurydice_, Boisduval, ♂. | | 2. _Meganostoma eurydice_, Boisduval, ♀. | | 3. _Meganostoma cæsonia_, Stoll, ♂. | | 4. _Meganostoma cæsonia_, Stoll, ♀. | | 5. _Colias meadi_, Edwards, ♂. | | 6. _Colias meadi_, Edwards, ♀. | | 7. _Colias ariadne_, Edwards, ♂. | | 8. _Colias ariadne_, Edwards, ♀. | | 9. _Colias keewaydin_, Edwards, ♂. | | 10. _Colias keewaydin_, Edwards, ♀. | | 11. _Colias nastes_, Boisduval, ♂. | | 12. _Colias nastes_, Boisduval, ♀. | | 13. _Colias elis_, Strecker, ♂. | | 14. _Colias elis_, Strecker, ♀. | | 15. _Colias pelidne_, Boisduval (_labradorensis_, | | Scudder), ♂. | | 16. _Colias pelidne_, Boisduval (_labradorensis_, | | Scudder), ♀. | | 17. _Colias behri_, Edwards, ♂. | | | | [Illustration PLATE XXXVI.] | +--------------------------------------------------------------+ _Butterfly._--Small butterflies, bright orange or yellow, margined with black. They are more delicate in structure and have thinner wings than most of the genera belonging to the subfamily of the _Pierinæ_. The outer margin of the wings is generally straight or slightly rounded, though in a few species the apex is somewhat acuminate. The outer margin of the hind wings is generally rounded, though in a few species it is acuminate. [Illustration FIG. 148.--Neuration of the genus _Terias_.] _Egg._--Strongly spindle-shaped, pointed and rounded at the base and at the apex, much swollen at the middle, its sides marked by numerous broad but slightly raised vertical ridges. _Caterpillar._--The caterpillars are small, relatively long, cylindrical, with the head quite small, the thoracic segments somewhat larger than the others, giving the anterior portion of the body a slightly humped appearance. They feed upon leguminous plants. _Chrysalis._--The chrysalis is compressed laterally, with the head pointed and the wing-cases forming a deep, keel-shaped projection on the ventral side, more pronounced than in any other genus except _Catopsilia_.