_Anal tubercles._ Exhibited only by the _Coccidinæ_ and by the larvæ of _Hemicoccidinæ_: two more or less conspicuous projecting processes at the abdominal extremity of the female, without any cleft, and in most instances projecting beyond the edge; usually bearing setæ. (Plate ii., Fig. 2, _c_, _d_.) _Antennæ._ Two jointed organs ("feelers") projecting from the anterior portion of the body, of variable length. (Plate i., Figs. 9, 10, 11, types.) _Apodous._ Without feet. _Apterous._ Without wings. _Bucca_, _buccal_. The mouth; belonging to the mouth. _Carina_, _carinated_. A keel or raised-ridge; keeled. _Cephalic region._ That part of the insect, male or female, which bears the eyes, antennæ, and mouth, but not including the first pair of feet. _Clavate._ Club-shaped; somewhat knobbed. _Claw._ The hooked terminating joint of the foot. (Plate i., Fig. 6, _cl._, type.) _Coxa._ The first joint of the foot, springing directly from the under-side of the thoracic region. (Plate i., Figs. 6 _c_, 7 _c_.) _Digitules._ Appendages observed on the feet, and often useful for distinguishing species. Usually there are two pairs. The "upper pair" spring from the upper side of the extremity of the tarsus, and are generally long, fine hairs, terminating in a knob. The "lower pair" spring from the base of the claw, and are usually broader and more trumpet-shaped than the upper ones. (Plate i., Fig. 8, type.) Sometimes either pair, or both, may be absent. In _Cœlostoma wairoense_ there are no "upper" digitules, and 24 "lower" ones on the foot of the male. (Plate xxi.) _Dimerous._ Two-jointed. _Dorsum._ The upper side of the body when the insect is in its natural position. _Dorsal._ On the upper side or dorsum. _Eyes._ Two coloured, granular or simple, round organs on the cephalic region of the female, near the base of the antennæ (Plate xiv., Fig. 2, _k_.; Plate xx., _b_); two, or four, coloured, granular, simple or facetted, on the head of the male (Plate i., Figs. 14, 15; Plate xxi., Fig. 2, _b_). _Femur._ The second joint of the feet, next the coxa, joined to it by the false joint "trochanter." (Plate i., Figs. 6 _f_, 7 _f_.) _Fringe._ A portion of the excreted substance, cotton or wax, produced by the spinnerets on the edge of the body in certain _Lecanidinæ_ and _Hemicoccidinæ_. It may be in the form of long glassy threads (_Planchonia_) or of more or less broad flat plates (_Ctenochiton_). (Plate vii., Figs. 2 _d_, 3 _a_; Plate xii., Fig. 2, _a_, _b_, _c_.)