THE CANADIAN ENTOMOLOGIST. 31 



proportionally smaller than before, and are now situated internally, 

 instead of at the surface, as in the tirst instar. The eyes on each 

 side are about on a line with and outside of the two dorsal spines which 

 have been mentioned as present on the cephalic region. The vestigial 

 legs and antennae can be distinctly seen, their relative position being 

 as before. The antennae are directed directly backward, reaching a little 

 over one-half the distance to the base of the fore legs. They are thick at 

 the base, narrowing toward the apex, covered with numerous minute 

 papillfe. Their segmentation is indistinct, sometimes two and sometimes 

 three segments being evident. They are immovable in this as well as the 

 following immature stages. The legs are short, similar to a truncated 

 cone in form, transversely wrinkled, with no distinct segments, terminating 

 in a rounded knob, which, perhaps, functions as an adhesive disc. A few 

 minute spines occur near the bases of all three pairs of legs. The 

 mouth-parts are as before. The pair of spines at the anterior margin of 

 the prostomial plate is wanting in this instar, but the pair on the ventral 

 surface under the operculum is present as in the first instar. The colour 

 remains as in the first instar. The length varies from .41 to .45 mm.; the 

 greatest width, from .22 to .26 mm. 



The second moult takes place in from four to five days after the first. 



Third Instar. 



In this instar the form, marginal and dorsal spines, marginal wax 

 secretion, rudimentary legs, ventral spines, eyes and colour of the body 

 are as in the second instar. The vasiform orifice is longer than wide, 

 in form resembling a triangle with rounded corners. Operculum nearly 

 semicircular, reaching about one-half the distance to the apex of 

 the orifice. Lingula essentially as in the second instar. The antennae 

 arise nearer to the bases of the fore legs than in previous instars. They 

 are indistinctly segmented, thick at the base, tapering toward the tip, the 

 basal two-thirds of each is directed directly inward toward the antenna of 

 the opposite side, while the apical tiiird is bent backward toward 

 the base, the whole forming a figure not unlike the letter J. 



The length varies from .56 to .63 mm.; the greatest width, from .32 to 

 .38 mm. 



The third moult takes place in about five or six days after the second. 



Pupa* (Fig. 4). 

 The form of the pupa is broadly elliptical, the margin finely 



*As is customary in describing species of this genus, the specific characters are 

 derived from the pupa. The description of this stage is therefore made complete in 

 itself, and is sufficient to distinguish this from all other described species, 



