OF ARTS AND SCIENCES. 



89 



a little shorter than those arising from the lateral tubercles of the rest 

 of the body. 



The anal legs are large and squarish, as in the group generally ; all 

 the legs, both thoracic and abdominal, are pale green. The abdomiual 

 legs bear each twenty crotchets. The three tenant hairs of the thoracic 

 feet are rather longer than usual. The spiracles are slightly chitinous, 

 not colored. 



The shape of the double dorsal tubercle on the 8th abdominal seg- 

 ment is shown at Figure 10, d' ; sd, the subdorsal ones ; a, a seta much 

 enlarged, which, unlike T. polyphemus, is finely and minutely barbed ; 

 a', «", ends of other sette. 



Stage II. — Moulted May 26, in the daytime. Length at first 

 9 mm., afterwards 10 mm. In one larva all the tubercles are of the 

 same yellowish hue ; in the other, those of the 2d and 3d thoracic 

 segments are brownish at the tip, thus greatly contrasting with the 

 others. In another larva the median dorsal tubercle on the eighth 

 uromere is also colored in the same way. The head in one is all 

 green, not yet banded with brown ; but in another the head is partly 

 banded, i. e. in place of the two-scalloped band are two separate short 

 scallops. 



The tubercles are now higher than before, and rough with slender 

 conical warts which give origin to the sette. The prothoracic tubercles 



