PLATE VI.

Fig. 47. The same species at the same stage. Black variety strongly

shagreened; similar to _Deil. Euphorbiæ_.

Fig. 48. Similar to the last. Yellow var. without any trace of

shagreening.

Fig. 49. _Deilephila Vespertilio._ Three stages in the life of the

species, representing three phyletic stages of the genus. A, life-stage

III.=phyletic stage 3 (subdorsal with open ring-spots); B, life-stage

IV.=phyletic stage 4 (subdorsal with closed ring-spots); C, life-stage

V.=phyletic stage 5 (subdorsal vanished, only _one_ row of ring-spots).

Fig. 50. _Deilephila Zygophylli_, from S. Russia; stage V. From a

blown specimen in Staudinger’s collection. In this specimen the

ring-spots are difficult to distinguish on account of the extremely

dark ground-colour; they are nevertheless present, and would probably

be more distinct in the living insect. A, open ring-spot from another

specimen of this species in the same collection.

Fig. 51. _Deilephila Nicæa_, from South France; Stage V. Copied from

Duponchel.

Fig. 52. _Sphinx Convolvuli_; Stage V., segments 10-8. Brown variety,

with distinct white spots at the points of intercrossing of the

vanished subdorsal with the oblique stripes.

Fig. 53. _Anceyrx Pinastri_; A and B, larvæ immediately after hatching.

Natural length, 6 millim.

Fig. 54. Same species; Stage II. Subdorsal, supra- and infra-spiracular

lines developed. Natural length, 15 millim.

Fig. 55. _Smerinthus Populi_; Stage I. Immediately after hatching; free

from all marking. Length, 6 millim.

Fig. 56. Same species at the end of first stage; lateral aspect.

Length, 1.3 centim.

Fig. 57. Same species; Stage II. Subdorsal indistinct; the first and

last oblique stripes more pronounced than the others. Length, 1.4

centim.

Fig. 58. _Deilephila Hippophaës_; Stage III. Subdorsal with open

ring-spot on the 11th segment. A, segment 11 somewhat enlarged. Length,

3 centim.

Studies in the Theory of Descent (Volumes 1 and 2) · 第 137 / 186 题