12 THE CANADIAN ENTOMOLOGIST. 



PREPARATORY STAGES OF CATOCALA ILIA, Cram. 



BY G. H. FRENCH, CARBONDALE, ILL. 



Egg. — Diameter, .06 inch. Shape s^jheroidal, the transverse diameter 

 being about one fifth more than the longitudinal ; striated longitudinally 

 with 28 strife, 15 of these reaching the shallowly punctured apex, these 

 ridges being crossed with a network of slight elevations, the transverse 

 and the longitudinal lines in the middle of the hollows making squares, the 

 interior of these squares being roughened, the corner of each square a 

 little more elevated and enlarged than the sides. Color brownish olive. 

 Duration of this period 234 days. 



Young Larva. — Length .25 inch. Color pale gray, one prominent 

 purplish black dorsal line and three less distinct lines on each side. Head 

 purplish black, piliferous spots and hairs the same color. Venter paler 

 than above, with a dark spot in the centre of each joint. Feet, 12. Dur- 

 ation of this period 6 to 7 days. 



After I St Moult. — Length .45 inch. Color pale gray, the markings 

 dark reddish purple ; dorsal line distinct, a wavy fainter line midway 

 between this and the subdorsal. The subdorsal line and two others before 

 reaching the lateral piliferous spots, distinct ; through the stigmatal region 

 two more or less continuous faint lines and a substigmatal distinct one, 

 making in all 9 distinct and 6 faint lines. A dark ventral spot on joints 

 4 to 8. The stripes of the body continuous on the head, though darker. 

 Thoracic legs dark purple, first and second pairs of abdominal legs begin- 

 ning to develop. Hairs and piliferous spots dark reddish purple. Dur- 

 ation of this period 3 days. 



After 2nd Moult. — Length .80 inch. The dorsal region in three 

 stripes, the central rather pale gray with a dorsal line in its middle a little 

 darker than the ground color. The outer stripe, reaching to the subdorsal, 

 is blackish gray, not very dark except in places, interrupted on joint 4, the 

 stripe bounded on each side by a wavy black line. The darker blotches 

 in this stripe are between joints 4 and 5, 5 and 6, 8 and 9, and on the 

 anal joint. I'he subdorsal region has two similar stripes, the upper pale 

 with a central line like the dorsal, the lower line dark, the lower boundary 

 line running through the stigmata. A substigmatal pale stripe has also a 

 dark central line. Venter pale with the dark spots as before. The stripes 

 are more or less continuous on the head. Piliferous spots small, hairs 



