of fourteen rings. The mouth is furnished with two sharp, scaly black hooks (Fig. 10 a,) and on either side the base of the second ring there is a calix-formed papilla, (Fig. 10 b,) the edges of which are scalloped. The twelfth ring is the broadest of all. The thirteenth has small papillæ on each side. The last ring is the smallest and from a back view shows the anus and two lower false feet. The tracheal canals run in a flexuous line to the thirteenth ring where they connect, near the papillæ, with a transversal canal. The general color of the body is a dirty white. The teguments are so transparent that the tracheal and alimentary canals can easily be observed. The papillæ on the second and thirteenth rings are reddish in color. Maximum length a trifle over a quarter of an inch. The pupa is an elongated ovoid in shape. The first and last rings are visible only from a ventral view (Fig. 11, 11 a, 11 b.) The papillæ of the second and thirteenth rings retain their primitive form. All the rings are fluted transversely.
In the first period the pupa is of a dirty white tinge, but changes to a light yellow, the papillae remaining red as does the orifice of the anus. Its length is one-seventh of an inch.
The head of the perfect fly (Fig. 12.), is a little broader than the anterior part of the thorax. The eyes are large and black, antennae three jointed. Its color is sometimes a light straw, and at others a deep yellow.
Of the three joints (Fig. 12 a.), the first is short, the second a little longer, the third twice as long as the second, and ending in a flexuous bristle, longer than itself.
Upper thorax gray, with three lengthwise black lines. Back of abdomen, specked with black, with a lengthwise band, and lower edges of the first two rings a deep yellow. Ventrical, a dirty dark yellow. Wings glossy, with blotches of brown in apex, sometimes another blotch on lower edge, at the extremity of the anal nerve.
The roots of the wings are a pale yellow. Feet light, tarsi a little darker. The borer and ovisac (Fig. 12 b.) is about the same
