14 Annals Entomological Society of America [Vol. XI, 



Description of Stages. 



The Egg. 



(Plate I, Fig. 3). 



When dissected out of the ovary, the egg presents a glistening 

 white appearance and measures from .36-. 40 mm. in length, and .13-. 15 

 mm. in width in its greatest thickness. The egg is elongate oval, 

 tapering considerably towards one end, and more or less rounded at the 

 other. The egg appears smooth, no markings are visible from the 

 outside. 



The Larva. 

 (Plate I, Fig. 2, and Plate II, Fig. 5). 



The young living larva is almost pure white, later becoming a 

 glistening creamy white. A light yellow line running longitudinally 

 through the center of the body represents the alimentary canal. The 

 innermost leaves of the leaf -bundle of the iris, not having been exposed 

 to the sunlight, are of a light yellow color, and the presence of this 

 color material in the alimentary canal is seen through the transparent 

 skin of the larva. 



The larva is long, cylindrical, measuring from 5-7 mm. in length, 

 when full grown, and about 1.3-1.6 mm. in diameter. It tapers slightly 

 toward either end. The head bears the black mandible or rasping organ 

 with four teeth, the first two somewhat larger than the other two. 

 (Plate II, Fig. 2). On the dorsal surface of the first thoracic segment, 

 just back of the head, are fotmd the two thoracic spiracles, borne on 

 short brown stalks, flaring at each end with from 14-17 lobed projections 

 on the outer margin. These lobes or tubercles have at the tip little 

 openings which lead to the tracheal tube attached at the base. (Plate 

 II, Fig. 3). 



On the ventral surface of the three thoracic segments occur small 

 transverse ambulatory ridges. The ridge on the first thoracic segment 

 is considerably larger than the following ones. 



On the last abdominal segment are found two brown anal spiracular 

 projections, each of which ends in three down-curved lobes, at the tip 

 of which are also found the small spiracles. (Plate II, Fig. 4). 



Just before pupation the larva shortens and thickens considerably, 

 the little ambulatory ridges are completely withdrawn, while the 

 spiracular projections are fully extended, and the larval skin changes 

 into the puparium. 



