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Fig. 1 —Sketch of Pitot tube Fig. 2.—Side view basal portion of Pitot tube.

Fig. 3 —Gregarine from mesenteron last nymphal instar X 73

Fig 4.—Tentorium side view Fig. 5.—Pleurites of nymph.

• po.a—posterior arm of tentorium

• d.a.—dorsal arm of tentorium

• a.a.—anterior arm of tentorium

• b.—body of tentorium

• ep—eplmeron

• epi—episternum

• tr.—trochantin

• t.—trochanter

• c.—coxa

• a.c.—antecoxal plate

Fig. 9—Nymphal labrum Fig. 10.—Nymphal mandible. Fig. 11.—Nymphal maxilla. Fig. 12 —Nymphal labium. Fig. 13.—Nymphal hypopharynx.

• ad a.—adductor apodeme

• s.d —salivary duct

• 1 —lacinia

• di g—distigalea

• b.g.—basigalea

• ea.—eustipes

• di.c.—disticardo

• b c.—basi-cardo

Fig 14—Thoracic sternites and tentorium of nymph dorsal aspect. Fig. 15.—Thorax of adult ventral aspect.

Fig. 16—Tibio-tarsus of nymph showing aquatic adaptation. Fig. 17.—Basal leg and wing tracheae of last nymphal instar.

Fig. 18.—R + M and Cu_{1 + 2} showing their tracheae and the absence of a trachea in the cross-vem between.

Fig. 19.—Tibio-tarsus of imago showing the absence of nymphal adaptation and the development of an empodium.

• hw.—hmdwing cu a.—cubito-anal trachea co.r.—costo-radial trachea st.—sternum f.—furca sp.—spinasternite f in.—furcal invagmation v.g.—vestigeal gills

Fig. 20.—Brain and sympathetic nerves ventral aspect. Fig. 21—Dorsal aspect ditto.

• fr g.—frontal ganglion

• p.c.—paroesophageal connective

• a.n.—antennary nerve

• tri c—triterocerebrum

• de.c—deuterocerebrum

• o g.—optic ganglion

• sym.n.—sympathetic nerve

• pro.c.—proterocerebrum

• st g.—stomachic ganglion

Fig. 28—S. prasina imago. X 4. Fig 29.—Male cersus showing bristles. Fig. 30—Male gemtalia ventral aspect. Fig. 31.—Ditto, side view Fig. 32—Female genitalia ventral aspect.

• hy.—hypandrum i.a—inferior appendage sup a.—superior appendage ae.—aedeagus

Fig 33—Alimentary canal of nymph. Fig. 34—Brain and suboesophageal ganglion in situ, side view. Fig 35—Anterior region testes Fig 36—Male accessory organs, ventral aspect. Fig. 37.—An ovariole. Fig. 38.—The germarium.

• oe.—oesophagus

• s.g—salivary gland

• cr.—crop

• r.n.—recurrent nerve

• g—gizzard

• m.—mesenteron

• m.t—malpighian tubules

• i.—ileum

• c.r.—colon-rectum

• ac.g—accessory gland

• v.s—vesicle seminalis

• v.d—vas deferens

• ej c.—ejaculatory sac

• d.e.—ductus ejaculatoris

• d.n.—anteunary nerve

• de.c.—deuterocerebrum

• tri.c.—triterocerebrum

• pro.c.—proterocerebrum

• o.g.—optic ganglion

• svmn.n.—svmpathetic nerve

• st g—stomachic ganglion

• oe.—oesophagus

• su.oe.g.—sub-oesophageal ganglion