PLATE 20. 



Section ^.—NEPINJ. 

 Family 1.— UANATRID^. 



Genus 1, Eaxatra (p. 581). Fig. 2, B. linearis (p. 582) ; 2a, an- 

 tenna ; 2b, head in profile ; 2c, fore leg. 



Family 2.— NEPID^E. 



Genus 1. Nepa (p. 583). Fig. 1, N. cinerea (p. 584); la, bead 

 in profile; lb, underside; Ic, antenna; Id, head and 

 rostrum in front ; \e, rostrum with the setae exserted ; 

 If, fore leg. 



Section ^.—NOTONECTINA. 

 Family L— NOTONECTIDi*]. 



Genus 1. Notoxeota (p. 585). Fig. 4, N. glauca (p. 587) ; 1«, 

 underside ; -hb, rostrum ; -he, antenna ; U, fore leg ; ^e, 

 middle leg; 4/^ hind leg. 



Family 2.— PLEID^. 



Genus 1. Plea (p. 590). Fig. 3, P. 7ninutissima (^.591). (See also 

 PI. 21.) 



Section b.—COBIXIiYJ. 

 Family L— CORIXID/E. 



Genus 1. Coeixa (p. 591). Fig. 5, 0. Geoffroyi (p. 593); 5«, under- 

 side $ ; 55*, head in profile ; 5c, antenna ; 5rf, pala $ 

 side view ; 5(9, pala ? , side view ; of, hind leg. {See also 

 PI. 21.) 



G^raws 2. Ctmatia (p. 613). (See PI. 21). 



Family 2.— SIGARID^E. 



Genus 1. Si&ara (p. 615). Fig. 6, *S'. minutissima (p. 616) ; 

 6«, pala cJ ; Qb, pala $ ; 6c and Qd, antenna. 



