1917] Pacific Coast Species of Xylococcus 161 



EXPLANATION OF PLATES. 



Plate XH. 



Xylococcus macrocarpce Cole, on Monterey Cj^press, showing filaments. 

 Xylococcus quercus Ehrh. on Quercus chrysolepis, showing filaments. 

 Position of Xylococcus macrocarpce Cole, under bark. 

 Xylococcus quercus Ehrh., adult females. 



Plate XIIL 



Xylococcus quercus Ehrh., fourth stage of female. 



Position of Xylococcus quercus Ehrh., bark removed. 



Pits of Xylococcus alnin. sp., insects removed, a, dorsal; b, ventral. 



Xylococcus quercus Ehrh., first larval stage. 



Xylococcus macrocarpce Cole., adult female, a dorsal; b, ventral. 



Xylococcus quercus Ehrh., adult female showing egg-mass. 



Xylococcus quercus Ehrh., pupa of male insect. » 



Xylococcus macrocarpce Cole., adult male. 



Plate XIV. 



Xylococcus macrocarpce Cole. 



Fig. 1. Antenna of first larval stage; e, eye. 



Fig. 2. Leg of first larval stage. 



Fig. 3. Abdominal stigmatal tube of first larval stage. 



Fig. 4. Posterior segments of abdomen of first larval stage, showing spines, 



pores, anal tube, and stigmatal tubes; a, dorsal; b, ventral. 

 Fig. 5. Anal tube of fourth stage of female; a, alimentary canal; b, anterior 



spinnerets; dd, posterior stigmatal tubes. 

 Fig. 6. Abdominal stigmatal tube of fourth stage of female, showing two rows 



of pores in constriction. 

 Fig. 7. Body pores of apodous stages of female. 

 Fig. 8. Antenna of adult female. 

 Fig. 9. Leg of adult female. 

 Fig. 10. Body pores of adult female. 

 Fig. 11. Antenna of fourth stage male. 

 Fig. 12. Leg of fourth stage male. 

 Fig. 13. Body pore of fourth and fifth stages of male. 

 Fig. 14. Antenna of pupa of male. 

 Fig. 15. Leg of pupa of male. 

 Fig. 16. Hind wing of adult male. 

 Fig. 17. Leg of adult male. 

 Fig. 18. Posterior end of body of adult male; al, groups of pores; a2, pore 



enlarged; b, sexual organ. 



Xylococcus quercus Ehrh. 



Fig. 19. Antenna of first larval stage; e, eye. 



Fig. 20. Posterior segments of abdomen of first larval stage, showing spines, 



pores, anal tube, and stigmatal tubes; a, dorsal; b, ventral. 

 Fig. 21. Anal tube of fourth stage of female; a, alimentary canal; b, anterior 



spinnerets; c, median spinnerets; dd, posterior stigmatal tubes. 



