344 Annals Entomological Society of America [Vol. XV, 



EXPLANATION OF PLATES. 



ABDREVIATIONS USED. 



C — Costa. 



Sc — Subcosta. 



Sci, Sc2 — its branches. 



R — Radius. 



Ri, R^, R3, R4. R5 — its branches. 



Rs — Stem of radial sector. 



M— Media. 



Ml, M2, Mg, M4— its branches. 



1st A — First anal vein. 



2d A — Second anal vein. 



2dAi, 2dA2> 2dA3— its branches. 



3dA— Third anal vein. 



3dAi, SdA... — its branches. 



4thAi — -Fourth anal vein. 



4thA2 — Presumed second branch of 

 fourth anal. 



hum — humeral cross-vein. 



arc — arculus. 



a. arc — anal arculus (cross-vein lst-2d 

 and base of 1st A). 



r — radial cross-veins. 



r-m — radiomedial cross-veins. 



m-cu— mediocubital cross-veins. 



cu-a — cubitoanal cross-veins. 



lst-2d a, 2d-3d a — interanal cross- 

 veins. 



O— Oblong cell (2dM). 



W— Wedge-cell (2d 2d A). 



st — Pterostigma. 



Plate XXIX. 



Fig. 1. Hypothetical plan of wing venation of Coleoptera, based mainly on 

 Cupes (base and cell), Cebrio (anal region) and Hydrophilus (apex). 

 The conventional symbols for the veins and cells are used, namely: 



Fig. 2. Tracheation of wing of imago of Calosoma species. The tracheae are 

 shown as solid lines, the veins stippled. 



Fig. 3. Tracheation of imago of Dytiscus verticalis. 



Fig. 4. Venation of Cupes capitata. 



Plate XXX. 



Fig. 5. Tracheation of young pupa of Dytiscus, from a preserved specimen. 

 The trachea are shown so far as made out, by solid lines, the vein- 

 cavities stippled. The specimen is imperfect and a fresh wing would 

 probably show more tracheas and veins. 



Fig. 6. Tracheation of young pupa of Tenebrio molitor (about one day after 

 pupation). The tracheae are all as shown in one mount, the veins 

 restored by comparison with the late pupa and imago. 



Fig. 6a. Tracheation of young pupa of Agrilus ruficollis. Slide by Henry Good. 



Fig. 7. Diagram of wing-folding of Cybister. The portions of the wing reversed 

 in folding are shown black. Concave folds are indicated by even 

 lines, convex ones by toothed lines. Regions of the wing, which 

 are half folded over, or crumpled, are hatched. 



Figs. 8, 9. Folded wing of Apate capucina (Polyphaga, Bostrychidas); the veins 

 cross-hatched and concealed portions dotted in. Dorsal and ventral 

 views. 



Figs. 10, 11. Folded wing of Colymbetes sculptilis (Adephaga, Dytiscidas); like 

 Figures 8 and 9. Dorsal and ventral views. 



Plate XXXI. 



Fig. 12. Cupes oculata (Cupedidfe). Slide by courtesy of C. T. Brues. 



Fig. 13. Tetracha virginica (Cicindelidce). 



Fig. 14. Galerita janus (Carabidee). 



Fig. 15. Harpalus caliginosus (Carabidae). 



Fig. 16. Same; folding plan (compare Figure 7). 



Fig. 17. Pheropsophus aequinoctialis (Carabidae; South America), 



Fig. 18. Trogus glaucus (Dytiscidae; South America). 



Fig. 19. Cnemidotus edentulus (Haliplidje). 



Fig. 20. Hydrous triangularis (Hydrophilidee). 



Fig. 21. Same, folding plan (compare Figure 7). 



Fig. 22. Hydrocharis obtusatus (Hydrophilidae). 



Fig. 23. Sphasridium scarabaeoides (Hydrophilidae). 



