130 THE CANADIAN ENTOMOLOGIST. 



PREPARATORY STAGES OF ARCTIA RECTILINEA, FRENCH. 



BY G. H. FRENCH, CARBONDALE, ILL. 



Egg. — Diameter, .03 inch; height, .03 inch; blunt conic; smooth. 

 When first deposited white ; after a few days yellow. Duration of this 

 period, five days. 



Young Larva. — Length, .07 inch. Cylindrical ; head a little larger 

 than body ; six rows of tubercles bearing long hairs. Colour of body 

 and hairs white; head black; a geminate black spot on top of joint 2. 

 Duration of this period, three days. 



After First Moult. — Length, .12 inch. Cylindrical; eight tubercles 

 to each joint ; pale reddish ; the tubercles darker red than the body, from 

 each a few hairs, those on the back black, lateral white ; head black ; two 

 spots of the same on top of joint 2. Duration of this period, five days. 



After Second Moult. — Length, .20 inch. Cylindrical; head a little 

 smaller than body ; pale dull brownish, perhaps a dark dull amber ; a 

 dorsal pale stripe in which is a whitish spot in the top of each joint ; a 

 paler subdorsal stripe, but lacking the white spots ; dorsal tubercles black; 

 the dorsal space a little darker than the sides ; lateral tubercles concolor- 

 ous or scarcely darker than the ground ; spreading tufts of hair from the 

 tubercles, the dorsal black, the lateral gray, all short ; a few hairs, one to 

 each tubercle, on posterior part of the body that are slightly longer than 

 the others. Duration of this period, five days. 



After Third Moult. — Length, .35 inch. Cylindrical ; head a little 

 smaller than the body ; eight tubercles to each joint ; the dorsal moder- 

 ately elevated, the loAver lateral less so, a gradation from one to the 

 other ; tuft of short spreading hairs of unequal length from each ; the 

 centre of tuft slightly longest ; the central hairs on posterior part of the 

 body a little longer than the others. Ground colour lilac-grey ; a dorsal 

 and subdorsal line of sordid white ; dorsal tubercles black, with the black 

 extending as a border along the upper side of subdorsal line ; the two 

 next tubercles dull pale orange, grey tipped ; the fourth ground colour, 

 with the tip darker ; ground colour outside of tubercles, and lines spotted 

 with black ; head and thoracic feet black ; hairs as before ; prolegs 

 smoky, light at tip. Duration of this period, three days. 



After Fourth Moult. — Length, .50 inch. Marked very much as 

 before but the ground colour darker ; dark gray, in some small examples 

 almost black ; the dorsal tubercles shiny black, the lateral yellow-brown ; 



