34 THE CANADIAN ENTOMOLOGIST, 



abdomen pale lemon yellow ; tip of rostrum black ; legs, rostrum, except 

 the tij), and the antennae, are of same colour as head and thorax. The 

 whole body, including appendages, is covered with a white, flour-like 

 substance, which is absent at the time of emergence from the pupa-case, 

 but appears in the course of an hour or two. This substance, presumably 

 waxy, is soluble in ether and xylol, but insoluble in alcohol and water. 

 The eyes are completely divided into an upper and a lower pair, both of 

 which are reddish brown in colour. The upper pair is smaller and 

 composed of smaller-sized facets than the lower pair. The antennae 

 consist of seven segments : first segment short and stout ; second segment 

 three times as long as the first, club-shaped, stout, with a iew slender 

 spines near the apex ; third segment over twice the length of the second, and 

 more slender ; segment four about one-fourth the length of the third and 

 narrower than it, cylindrical at the base, slightly enlarged at the tip; 

 segment five one-half as long again as four, of the same form, but 

 more elongate ; segment six slightly shorter than five, but longer than 

 four, club-shaped, more slender ; segment seven is slightly shorter than 

 six, spindle-shaped, with a small spine arising from a tubercle situated a 

 little beyond the middle, and another smaller spine arising from the tip of 

 the segment. All the segments of the antennae, except the first two and 

 the tip of the last, are ringed with chitinous ridges. The hind femur is 

 about two-thirds the length of the tibia, the tarsus is about one-third the 

 length of the tibia, and the second tarsal segment is about two-thirds the 

 length of the first tarsal segment. Average length of thfe hind femur 

 about .275 mm.; of the tibia, about .38 mm. The trochanters of the 

 posterior pair of legs are deeply grooved on the caudal side, and at the 

 bottom of the cavity thus formed arises a single stout spine, which 

 is directed upward and outward. The vasiform orifice is subcircular in 

 outline. The operculum is concave on its caudal margin, and covers the 

 anterior half of the orifice. The lingula is protruding, setose, gradually 

 enlarging distally, and squarely truncate at caudal end. The fore and hind 

 wings are each provided with a single unbranched median vein. The 

 margin of the wings is beaded all round, each bead consisting of a minute 

 globule, from the outer side of which two or three minute §etae arise. The 

 length of the fore wings is about i mm.; width, about .5 mm. The 

 rostrum is three-jointed. Ovipositor ordinary, usually bent upwards 

 when not in use. 



$. Average lengiii aoout .90 mm. Proportionately smaller than 

 female, otherwise differs only in the sexual organs. 



