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 h placed in triangular continuation of 

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

 Fig. 20. — Dorsal surface of maxilla;, ligula, maxillulse, and hypopharynx: hyp, Hypopharynx; li, 

 buccal side of ligula; mxl, maxillular area with longitudinal series of short setae; hyp, hypopharynx 

 with sling-shaped chitinization (fir) 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 inner wall of mandible: bm, 

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

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

 wall with fossa mandibular is; inner wall with anterior cavity, posterior thickening, 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, inner lobe of mala (lacinia), show- 

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

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

 Ligula; m, mentum; ma, maxillary articulating membrane; sm, submentum; st, stipes of left maxilla; 

 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: cr, Epipharyngeal rod. Fig. 32.— Prothoracic spiracle. 

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



