PROCEEDINGS, 1918 39 



Color, dark yellow, tinged with pink. Cap, lighter in col- 

 or and surmounted by a circlet of blunt spines. 



Length, 1.9 m. m.-1.95 m. m. Width, at widest point, .7 

 m. m. 



The Larva. 



The larva on emerging from the egg eats a circular hole in 

 the cap and shortly after escaping begins devouring its egg 

 shell until it is completely gone. It is very sluggish in its 

 movements and remains where it has hatched for several hours, 

 then slowly finding its way to a (Golden Rod) plant, it crawls 

 up it and begins feeding on the tender leaves. For a week or 

 more after emerging, the la'rva feeds by eating out small cir- 

 cular holes in the leaf, but later devours it entirely. It is usual 

 for the larVa to drop from the plant upon being approached, 

 hiding in the grass and leaves found at its base. 



Description of Stages. 



First Instar. General appearance short and thick. Body 

 rather convex dorsally, widest at third thoracic segment; tap- 

 ering gradually towards the posterior extremity. Entire sur- 

 face finely punctate. The body is composed of twelve segments 

 and each of the abdominal bears ten tubercles, surmounted by 

 a short, black spine; these form a double longitudinal row 

 over the dorsum, a double row on the lateral margins and two 

 single rows along each of the ventral lateral margins. Besides 

 these there are a few additional ones on the thoracic and anal 

 segments, the prothoracic bearing a circlet of spines on its an- 

 terior margin. 



Antennae, short, and appear to be 3-jointed. Mandibles, 

 short and thick. Legs, 5-jointed, corneus, the margins bearing 

 a few short hairs and the tarsi terminated by a hooked claw. 



Color, upon emerging, dark reddish brown, the thoracic 

 segments being a trifle darker than the abdominal, but after a 

 couple of days the entire body becomes lighter and unicolorous 

 Head, jet black. Antennae, same color as body, but the first 

 and third segments are lighter than the second. Mafidibles, 

 black, except the extreme end which is lighter. Legs, black, 

 except coxa and trochanter; these are light brown. 



Length of body, 1.93 m. m.-2.00 m. m. Greatest width .625 

 m. m.-.680 m. m. Width of prothoracic segment .5 m. m.- 

 -.56 m. m. Width of head .375 . m.m.-.412 m. m. 



