5ul. 1107, U. S. Dept. of Agriculture. 



Plate I. 



The Lead-Cable Borer (Scobicia declivis). 



Figs. 1-7 and 9-12.— First-stage larva. Figs. 13-15.— Second-stage larva. Fig. 16.— Mature larva. 

 Fig. 8. — First-stage larva of Lyctus sp.: Posterior end of ninth abdominal segment with two cerei, 

 oblique view from behind. Fig. 1.— Lateral view. Natural length, 0.75 millimeter. Fig. 2.— Antenna: 

 a, Antenna! joint; 6, basal ring; c, supplementary joint; d, basal membrane. Fig. 3. — Labrum. and 

 elypeus, dorsal view: cl^ Clypeus. Fig. 4. — Antenna, epipharjmx, and mouthparts: a, Dorsal tooth- 

 hke thickening of mandible; 6, ventral tootMike tliickening of same; c, thin chitinous wall between a 

 and 6,- d, flat inner surface; ep, epipharynx; m, mentum; ma, maxiUary articulating area; sm, sub- 

 mentum. Fig. 5. — MaxiUa: I, Inner lobe represented by stylus-like chitiniEation; g, outer lobe; 1, 

 basal joint of maxillary palp; 2, apical joint of same; 3, tactile papUlse. Fig. 6. — Labium: li, Ventral 

 side of ligula; 1, basal joint of labial palp; ;?, apical joint of same. Fig. 7. — Tail spur, outhne seen from 

 below. Fig. 9. — Lateral view. Natural length, 0.75 millimeter. Fig. 10. — Skin with prothoracic leg 

 (I). Fig. 11.— Skin with mesothoracic leg (II). Fig. 12.— Skin with metathoracic leg (III). Fig. 13.— 

 Lateral view. Natural length, 0.56 miUimeter. Drawn with same magnification as Figure 9. Fig. 

 14. — Right mandible, showing its interior or biting surface. Fig, 15. — Ventral mouthparts: DetaUs of 

 ventral surface. Fig. 16. — Lateral view. Natural length, 10 milltnieters. AH figures drawn by Adam 

 G. Boving, except Figure 8, which is by T. E. Snyder, and Figure 16, which is by Miss E. Armstrong. 



