. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. *-* **rt ~^*» ""'*" "D n a.™ o) 3^" rr o o .p j* n> o 2 " o 55. jf0'-. 3 O t !=frl '-OP s o 2- * ~ B- ~- fj'1?' 52 - 3 sa -> a 3 . I - 4T 5^ f' cr c o The Life-History and Anatomy of Butterflies himself more thoroughly and accurately as to the internal anat- omy of these insects may consult with profit some of the treatises which are mentioned in the list of works dealing with the sub- ject which is given elsewhere in this book. Polymorphis
. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. *-* **rt ~^*» ""'*" "D n a.™ o) 3^" rr o o .p j* n> o 2 " o 55. jf0'-. 3 O t !=frl '-OP s o 2- * ~ B- ~- fj'1?' 52 - 3 sa -> a 3 . I - 4T 5^ f' cr c o The Life-History and Anatomy of Butterflies himself more thoroughly and accurately as to the internal anat- omy of these insects may consult with profit some of the treatises which are mentioned in the list of works dealing with the sub- ject which is given elsewhere in this book. Polymorphism and Dimorphism.—Species of butterflies often show great differences in the different broods which appear. The brood which emerges in the springtime from the chrysalis, which has passed the winter under the snows, may differ very strikingly from the insect which appears in the second or summer brood; and the insects of the third or fall brood may differ again from either the spring or the summer brood. The careful stu- dent notes these differ- ences. Such species are called polymorphic, that is, appearing under dif- ferent forms. Some spe- cies reveal a singular difference between the sexes, and there may be two forms of the same sex in the same species. This is most common in the case of the female butterfly, and where there are two forms of the female or the male such a species is said to have dimorphic females or males. This phenomenon is revealed in the case of the well-known Turnus Butterfly; in the colder regions of the continent the females are yellow banded with black, like the males, but in more southern portions of the continent black females are quite common, and these dark females were once (u i—i- fo *-' ts. *-* • "> 5T o 3 - • J5 _^ J*-- t/i 9- ^ .. =r . CD ^ —: -- u £ 2. a. crj-i "£ '%% R =? ^^-2, ETo's; p-~i * ft — T — * — - S^- (D CB rt T3 O" o" E. "• •§ y^M- ro •"•" S' Q-2 ~
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Keywords: ., bookauthorhollandwjwilliamjacob, bookcentury1800, bookdecade1890
