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



Plate II. 



The Lead-Cable Borer (Scobicia declivis). 



Morphological details of mature larva. Fig. 17. — Dorsal surface of head: e, Epistoma; es, epicranial 

 suture, dorsal part. Fig. 18. — Lateral surface of head. Fig. 19. — Ventral surface of head: es, Epi- 

 cranial suture, ventral part; h, hypostoma (see arrow; letter ft placed in triangular continuation of 

 hypostoma); tb, tentorial bridge, partly overlapped by presternal part of cervical membrane. 

 Fig. 20. — Dorsal surface of maxillae, ligula, maxOlulfe, and hypopharjmx: hyp, Hypopharynx; li, 

 buccal side of ligula; mxl, maxiliular area with longitudinal series of short setae; hyp, hypophar3Tix 

 with sUng-shaped chitinization (ftr) shining through surface. Fig. 21. — Anterior surface of head: p, 

 Pleurostoma. Fig. 22. — Tentorium, ventral surface: ta, Tentorial arm; tb, tentorial bridge. Fig. 23. — 

 Dorsal surface of left mandible. Fig. 24. — Longitudinal section of iimer wall of mandible: bm. 

 Thickening of basal margin; g, globular enforcement of posterior portion of wall. Fig. 25. — Left 

 mandible, showing base with marginal thicltening which carries trapeze-shaped chitinization; dorsal 

 wall with fossa mandibularis; inner wall with anterior cavity, posterior thiclcening, and intermediate 

 portion. Fig. 26. — Left mandible: Inner or buccal surface. Fig. 27. — Ventral surface of right maxilla: 

 c, Cardo, showing its entire surface; g, outer lobe of mala (galea?); I, iimer lobe of mala (lacinia), show- 

 ing the small membranous part and the stylus-like chitinization; pg, palpiger; st, stipes. Fig. 28. — 

 Antenna, clypcus, and labrum, dorsal surface. Fig. 29. — Ventral mouthparts, ventral surface: li, 

 Ligula; m, mcntum; ma, maxillary articulating membrane; sm, submentum; st, stipes of left maxiUa; 

 stl, stipes labii. Fig. .30. — Exterior surface of distal end of left prothoracic leg: s, Spine; t, claw- 

 shaped tarsus; ti, tibia. Fig. :31. — Epipharynx: er. Epipharyngeal rod. Fig. 32.— Prothoracic spiracle. 

 All figures, greatly enlarged, drawn by Adam G. Boving. 



