OF ARTS AND SCIENCES. 91 



in T. pohjphemus ; it is of a deeper pea-green than the body, which is 

 in general, especially on the dorsal side, paler than in T. polyphemus. 

 The labrum and jaws are pale. There is a chestnut-colored ocellar 

 patch. 



The segments are now quite convex, swollen under the base of the 

 tubercles, the 2d and 3d thoracic segments being fuller and more angu- 

 lar than the uromeres ; they are a little more so than in T. polyphemus. 



The four dorsal tubercles of the 2d and 3d thoracic segments (two 

 each) are larger than the abdominal ones, and are tipped with dark 

 carmine at the end, and each, besides one or two short sette, bears a 

 long black slender hair, about as long as the body is thick ; the corre- 

 sponding hairs on the abdominal tubercles being about one third as 

 long. There are four well developed prothoracic tubercle-, the dorsal 

 ones larger, more rounded and prominent than in T. polyphemus, and 

 also bearing besides three or four small, short pale hairs, and a black 

 very long one. The prothoracic tubercles are deep rosy pink, not 

 coral-red. The lateral ones on the same segment are nearly twice as 

 large as those behind in the same series, and all on the body are rosy 

 pink or " crashed strawberry " color. The lateral infraspiracular 

 ridge along the abdominal segments is distinctly lemon-yellow. The. 

 spiracles are faint reddish green, quite inconspicuous. The thoracic 

 legs are reddish. The middle abdominal legs are green above, below 

 is a narrow distinct black stripe, the end yellow, while the planta is 

 livid flesh-color ; the anal legs with an anterior oblique yellow band, 

 and a black spot corresponding to the black stripe, with black hairs 

 above, as on the middle legs. The suraual plate is faintly edged with 

 yellow. 



The larva in this stage differs from T. polyphemus of the same age 

 in the green head, the distinct lateral yellow stripe below the spiracles, 

 which are green, and not readily seen. The six dorsal thoracic tuber- 

 cles are distinctly larger and more prominent than the abdominal ones, 

 and they each bear a single very long slender black hair, besides one 

 or two short ones ; this is a good generic character, separating it at 

 once from T. polyphemus, and the suraual plate is not edged with pur- 

 ple, but with faint yellow. 



When fully fed,* its length is 65 mm. Maine, August 20. The 

 head is green, of a different hue from the body, more like Paris-green. 

 The body is large, heavy, plump, and thick, much as in T. polyphemus^ 

 and the tubercles are pinkish red, or crushed strawberry. The suranal 



* Dyar states that there are but four stages. 



