74 Annals Entomological Society of America [Vol. X, 



EXPLANATION OF PLATES. 

 Plate IV. 



Fig. 1. Lateral view of the larva of Mallodon dasystomus Say. Ami) Amp, Ambul- 

 atory ampulla; Hy P, hypopleurum; in seg, inter.segmental area; pi disc, 

 pleura] disc; PI Tu, pleural tubercle; PI Z, pleural zone; Pnot, pronotum; 

 P. Scl, postscutellum; S, spiracle; Sp A, spiracular area. 



Fig. 2. Lateral view of the larva of Monohammus confusor Kirby. Amb Amp, 

 Ambulatory ampulla; C Inv, chitinous invagination; Hy P, hypo- 

 pleurum; PI Tu, pleural tubercle; Pnot, pronotum; S, spiracle. 



Fig. 3. Enlarged pleural disc of the first abdominal segment of Mallodon dasysto- 

 mus Say. C PI, center of pleural disc, with chitinous cap; R PI, ridge 

 of pleural disc. 



Fig. 4. Pleural tubercle of the sixth abdominal segment of Monohammus confusor 

 Kirby. C Inv, chitinous invagination; PI Tu, pleural tubercle; Se, seta. 



Plate V. 



Fig. 5. Left side of the third abdominal segment of Ergates spiculatus opened from 

 the dorsal side. A A , anterior attachment of chordotonal ligament; 

 Ch L, chordotonal ligament; Ch N, chordotonal nerve; G Cn, ganglion 

 of central nervous system; Hy P, hypopleurum; in seg, intersegmental 

 area; N, nerve; P A, posterior attachment of chordotonal ligament; 

 PI Z, pleural zone; S, .spiracle. 



Fig. 6. Left side of the sixth abdominal segment of Monohammus confusor Kirby, 

 opened from the dorsal side. A A, anterior attachment of chordotonal 

 ligament; Ch L, chordotonal ligament; Ch N, chordotonal nerve; 

 C Inv, chitinous invagination; G Cn, ganglion of central nervous system; 

 Hy P, hypopleurum; in seg, intersegmental area; N, nerve; P A, posterior 

 attachment of chordotonal ligament; PI Tu, pleural tubercle; PI Z, 

 pleural zone; S, spiracle. , 



Plate VI. 



Fig. 7. Longitudinal vertical section of the pleural tubercle and chordotonal 

 ligament of Monohammus confusor showing two scolopophores. A B S, 

 attachment of l^inding svibstance, at anterior end; B S, binding sub- 

 stance; B S N, binding substance nucleus; C C, cap cell; CCA, cap sell 

 attachment, at anterior end; C C N, cap cell nucleus; Ch N, chordotonal 

 nerve; C Inv, chitinous invagination; E C, enveloping cell; E C N, 

 enveloping cell nucleus; E K, end knob; F, fibrils of cap cell; Hyp, 

 hypodermis; M C, modified cuticula; P C, primary cuticula; S Ci, 

 secondary cuticula; S C, sense cell; Sc, scolopale; S. C. N, sense cell 

 nucleus; T L, terminal ligament; V, vacuole. 



Fig. 8. Longitudinal vertical section of the pleural zone and chordotonal ligament 

 of Ergates spictilattis showing two scolopophores; A B S, attachment of 

 binding substance, at anterior end; B S, binding substance; B S N, 

 binding substance nucleus; C C, cap cell; C, chitinous cap; C C N, cap 

 cell nucleus; Ch N, chordotonal nerve; E C, enveloping cell; E C N, 

 enveloping cell nucleus; E K, end knob; F, fibrils of cap cell; Hyp, 

 hypodermis; M C, modified cuticula; P C, primary cuticula; S Ci, 

 secondary cuticula; S C, .sense cell; Sc, scolopale; S C N, sense cell 

 nucleus; T L, terminal ligament; V, vacuole. 



Plate VII. 



Fig. 9. Enlarged portion of scolopophore. A F, axis fiber; C C, cap cell; C C N, 

 cap cell nucleus; E C, enveloping cell; E C N, enveloping cell nucleus; 

 E K, end knob; F, fibrils of cap cell; Sc, scolopale; S C, sense cell; S C N, 

 sense cell nucleus; T L, terminal ligament; V, vacuole. 



Fig. 10. A is an enlarged peg shaped body or scolopale with portions of the three 

 cells of the scolopophore. 5 is a cross-section in the region of the 

 proximal portion of the scolopale. C is a cross section in the region 

 of the center of the .scolopale. Z) is a cross-section in the region of the 

 end knob. A F, axis fiber; C C, cap cell; DSC, distal portion of sense 

 cell; E C, enveloping cell; E K, end knob; F, fibrils of cap cell; Sc, 

 scolopale; R, rib of scolopale; T L, terminal ligament; V, vacuole. 



