THE SADDLED PROMINENT. 321 



Egg. Pale pellucid green, the color of the ribs of the beech leaf. It is 

 circular in outline with a diameter of r.ig mm. The surface which is 

 applied to the leaf is flat and the exposed surface is an unsculptured 

 convex. The eggs are deposited singly and adhere firmly to the leaf. 



Larva. In this stage the insect defies description particularly in the 

 last instars as the dorsal pattern is exceedingly variable. In the first 

 instar the species is characterized by 9 pairs of horns. In the latter 

 instars the caterpillars may be in general described as green with dorsal 

 longitudinal lines of various colors variously interspaced with designs of 

 various shapes and colors. Such a description would at least convey an 

 idea of the most striking characteristic of these larvae, — their high degree 

 of variation as to markings. The most nearly constant of these is a 

 reddish brown spot on the back of the caterpillar. This, the writer has 

 designated as the saddle mark from its position and in some cases its 

 form. The saddle designs figured in the bulletin were drawn from the 

 specimens reared or collected during the summer of 1908, and give a sug- 

 gestion of the variation of this mark no one of which seems to be exactly 

 like any other. Those caterpillars which cannot find an original design 

 for their saddle evade the responsibility by appearing with no saddle at 

 all. Following is a description which will perhaps serve the present pur- 

 pose. The form is illustrated by the accompanying figures and the size 

 indicated by the hair line under them. 



Larva. First Instar. Figure 16. Body and abdominal legs dull dark 

 red, — head darker red. True legs black. 9 pairs of black horns occur 

 along the mid dorsal line, each situated on a black enameled spot. The 

 first pair just back of the head are much the largest and branched so that 

 they have the appearance of antlers. There are no horns on the second 

 and third thoracic segments or the seventh abdominal segment. The 

 caudal end of the abdomen is held in an elevated position. 



Larva. Second Instar. Figures 17 and 18. Body and head dark rose 

 pink. The dorsal horns of the first instar have disappeared and are rep- 

 resented merely by two straight pointed projections on the first thoracic 

 segment and by a pair of very minute points on the first, second, third, 

 fourth, fifth, sixth and eighth abdominal segments. These minute points 

 are black and are situated on a greenish brown mid dorsal spot. 



Larva. Third Instar. Figure 19. Body green marked with bright 

 reddish brown, except for slight tubercles representing the prothoracic 

 horns. The body is smooth. The head is conspicuously large at the 

 beginning of the instar with a broad pale reddish band on each side. 



Larva. Fourth Instar. Figures 20 and 21. Body green with dorsal 

 reddish brown markings varied. Head large with broad lateral band 

 composed of 4 stripes colored black, white, pink, and yellow. 



Larva. Fifth and last Instar. Figure 22. Body usually beech leaf 

 green with a bluish cast though some are brownish and some vary from 

 straw to almost lemon yellow and others from lavendar to deeper purple. 

 (These were insectary caterpillars which had not been exposed to the 

 direct rays of the sun.) The dorsal pattern was not exactly alike in any 

 two of the caterpillars bred, varying from a pale design in whitish yellow 



