. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. Fig. 262. — P. yuccasella. a, lar- va; b, female moth with closed wings ; c, do. with wings expanded ; d, side view of larval segment; e, head of larva from below ; /, do. from above; g, thoracic leg of do. ; h, maxilla; /, mandible; j, spin- neret and labial palpi; k, antenna, enlarged. (After Riley, "Insect Life," Vol. IV, p. 360.) Tineidae pollen with her mouth, which is peculiarly modified to enable her to do this, and then applies the pollen to the stigma with
. The butterfly book; a popular guide to a knowledge of the butterflies of North America. Butterflies -- North America. Fig. 262. — P. yuccasella. a, lar- va; b, female moth with closed wings ; c, do. with wings expanded ; d, side view of larval segment; e, head of larva from below ; /, do. from above; g, thoracic leg of do. ; h, maxilla; /, mandible; j, spin- neret and labial palpi; k, antenna, enlarged. (After Riley, "Insect Life," Vol. IV, p. 360.) Tineidae pollen with her mouth, which is peculiarly modified to enable her to do this, and then applies the pollen to the stigma with in- finitely better care than it could be done by the most skilful horticul- turist using the most delicate human appliances. There are several species of the genus Promiba, and they hold a positive and well-ascertained re- lationship to the various species of the plants in the economy of which they perform so important a function. Pronuba yuccasella pollenizes in the Eastern States the blossoms of the common Yucca filameiitosa, and on the Western plains it performs the act for the blossoms of Yucca angustifolia. Yucca brevifolia is pollenized by Pronuba syiithelica. Yucca whipplei is pollenized by Pronuba maculata. No doubt there are other species of Yucca which will be ultimately discovered to have species of Pronuba which are adapted in their organs to the work of pollenation according to their peculiar requirements. The larva of Pronuba, after it has attained to full size, drops to the ground, having three pairs of thoracic legs, which enable it to move about and burrow into the earth. It then undergoes transformation into the pupal state. The chrysalis, which is depicted in Fig. 263, has the back armed with peculiar spinous processes, which enable it to make its way through the loose soil. The student who desires to become fully acquainted with this interesting chapter in insect life must consult the altogether admi- rable papers written upon the subject by Pro- fessor R
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