EXPLANATION OF PLATE LVIII. 



PHYSOKERMES ABIETIS. (Page 132.) 



Fig. 1. Female insects natural size in situ on branch of spruce 

 fir. 



Fig. 1 a. Terminal bud- scales under which the larvae locate 

 themselves. 



Fig. 2. Remarkable variety of the female, natural size, dis- 

 covered in Bohemia by Dr*. Karel Sulc (after Sulc). 



Fig. 3. Adult female with left-hand portion of body cut away, 

 revealing the left-hand internal cavity or pouch with the ova. 

 a a, line of section shown at fig. 3 a ; b, abdomen with a few 

 remaining ova ready for extrusion ; c, central body-wall or 

 septum ; d, posterior portion of same ; e, cavity or pouch con- 

 taining extruded ova ; /, slit in central wall or septum ; g, 

 approximate position of genital orifice, x 20. 



Fig. 3 a. Transverse section of adult female at a a in fig. 3 ; 



b, abdomen with few remaining ova ready for extrusion ; 



c, central body-wall or septum (dorsal portion) ; d, ventral 

 portion of same ; e, cavity or pouch for the reception of the 

 ova ; /, slit in central wall or septum. 



Fig. 4. Adult female after maceration in potash ; b, rostrum 



c, cornicles; d, cephalic extremity (profile), x 20. 

 Fig. 5. Ventral view of adult female after maceration in potash ; 



a, opening at ventral extremity of partition wall or septum ; 



b, rostrum ; c, cornicles at posterior extremity ; d, cephalic 

 extremity, x 20. 



Fig. 6. Dorsal derm-cells of adult female, near cornicles. 



x 140. 



Fig. 6 a. Derm-cells of adult female, with reticulation. X 140. 

 Fig. 7. Rostrum of adult female, with filaments, x 140. 

 Fig. 8. Anal ring of adult female. X 300. 

 Fig. 9. Spiracle of adult female, x 600. 

 Fig. 10. Ventral dermis of second-stage female, x 600. 

 Fig. 11. Antennae of second-stage female. X 140. 



