

Bui. 1107, U. S. Dept. of Agriculture. 



Plate I. 



The Lead-Cable Borer (Scobicia declivis). 



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

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

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

 a. Antennal joint: h, basal ring: c, supplementary joint: d, basal membrane. Fig. 3- — Labium and 

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

 like thickening of mandible;" 6, ventral toothlike thickening of same: c, thin chitinous wall between a 

 and b; d, flat inner surface; ep, epipharynx; m, mentum; ma, maxillarv articulating area: sm, sub- 

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

 basal joint of maxillary palp: 2, apical joint of same; 3, tactile papilla?. Fig. 6. — Labium: ft, Ventral 

 side of ligula; 1, basal joint of labial palp; 2, apical joint of same. Fig. 7.— Tail spur, outline seen from 

 '. 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 milhmeter. Drawn with same magnification as Figure 9. Fig. 

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

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

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



