X Explanation of Terms. 



Prothorax. — The anterior division of the thorax, bearing the first pair of legs. 

 Puparium. — Used here for the covering-scale formed by the Diaspitia. 

 Pupa. — The ' chrysalis ' or resting stage of an insect. 

 Pupiform. — Shaped like a ' pupa' or ' chrysalis.' 



Pygidiutn. — The compound terminal segment of the Diaspina: and ConchaspincE. 

 Reniform. — Shaped like a kidney. 



Rostral apparatus. — The mouth-parts, comprising (in the Coccidse) the 'ros- 

 trum,' * mentum,' and ' rostral setas.' 

 Rostral setce. — The four long hair-like processes which together form the 



sucking-tube. 

 Rostrum.— \5std here for the upper parts of the mouth, from which spring the 

 'rostral setae;' probably consisting of the clipeus and labrum fused 

 together. 

 Rugose. — With fine wrinkled lines. 



Sac. — The separate cottony envelope secreted by many Coccidae. 

 Scale. — The puparium of a Diaspid. The waxy covering of a male Lecaniid- 

 Used also as a general term or abbreviation for ' scale-bugs ' or ' scale 

 insects.' 

 Scale-bug., Scale z«j^r/.— Popular terms for any member of the family Coccidae. 

 Scutes. — Circumscribed chitinous plates on the surface of the body, particularly 



on the several parts of the thorax. 

 Scutelliim. — A conspicuous shield-shaped ' scute ' on the dorsal surface of the 



' metathorax.' 

 Secretion.— Matter produced by the various glands of the body. More par- 

 ticularly the waxy, fibrous, cottony, or silken substances of which the 

 coverings of various Coccidse are composed. 

 Secretlonary.— Consisting of ' secretion.' 

 Secretionary supplement. — That part of a Diaspid scale extending beyond or 



around the 'pellicles.' 

 Secretory. — Concerned in the process of 'secretion.' 

 Segments., Somites. — The transverse divisions of the body. 

 Serrated. — With margin notched like a saw. 

 Serratulate. — Having very fine saw-like notches. 

 Seta.— A stout hair or bristle. 

 Setiferous. — Bearing ' setae.' 

 Somites. — (See ' Segments.') 



Spatulate. — Shaped like a spatula. Flattened and dilated at the tip. 

 Spinnerets.— Organs concerned in the emission of the silky or cottony filaments 



of which the ' scales ' or ' sacs ' of various Coccidas are composed. 

 Spiracles, Stigmata. — The respiratory orifices. {PI. I., fig. lo, d.,/.) 

 Sqitames. — The flattened, fimbriated, or spine-like marginal processes of the 

 'pygidium' in the Diaspince, other than the 'lobes' and true spines. 

 (' Plates ' of Comstock : ' scaly hairs ' of Maskell). {PI. \.fig. 14, k., I.) 

 Stigmata. — (See ' Spiracles.') 

 Sub. — As a prefix, indicating approximateness. 

 Sub-circular. — Approximately circular. Not quite circular. 

 Suctorial. — ' Suctorial insects,' are such as have mouths constructed for sucking 

 and take their food in a liquid form ; in contradistinction to 'mandibulate 

 insects ' which have jaws and bite their food. 



