PLATE C. 



Lachnus PiOEiE. (Page 58.) 



Fig. 1. — Apterous viviparous female, a. The long 

 rostrum in situ. 



Fig. 2. — The rostrum much magnified, with details 

 of the antennge. b. The sheath with its very long 

 setas. c. The labrum. 



Fig. 3. — The sixth and part of the fifth antennal 

 joints, d represents the tubercular rings much mag- 

 nified. Suggestions as to the functions of these drum- 

 like orifices may be found on page 13, vol. i, of this 

 Monograph. 



Fig. 4. — Enlarged view of a sprig of the spruce fir, 

 crowded with the polished eggs of the above Aphis. 



