Explanation of Terms. ix 



Larva, larval stages. — The immature insect. The early stages of the insect 

 previous to the pupa. (In the Diaspince the larval stages end with the 

 second moult.) 

 Line ('"). — The twelfth part of an inch. 



Loie. — Any prominent rounded process. More especially applied to the rounded, 

 tooth-like processes on the margin of the ' pygidium ' in the Diaspince. 

 Sometimes also applied to the prominent lateral expansions of the ab- 

 dominal segments. 

 Mentum. — The lower part of the mouth, which in the Coccidse takes the form 

 of a conical process channelled on its upper surface to receive the rostral 

 setae or sucking-tube. 

 Mesad. — Situated towards the middle— in relation to some other part. 

 Mesal. — Relating to the middle. 



Mesosternmn. — The ventral parts of the ' mesothorax.' 

 Mesothorax. — The median division of the thorax, bearing the second pair of 



legs and the fore wings — when present. 

 Metamorphosis. — A change of form. The transformations of an insect during 



its development. 

 Metasternu?n. — The ventral parts of the ' metathorax.' 



Metathorax. — The hinder division of the thorax, bearing the third pair of legs 

 and the hind wings — when present (or the ' halteres in the males of the 

 Coccidse). 

 Millimetre {mm). — The loooth part of a metre. Approximately equal to the 



twenty-fifth part of an inch. 

 Monomerous. — Of a single piece or joint. 

 Mucronate. — Sharply pointed. 

 Nervures. — The so-called veins of the wing. 



Ocelli. — The simple or supplementary eyes. (In the greater number of male 

 Coccidas the ' ocelli ' are greatly enlarged, and take the place of the true 

 eyes which, in such cases, are quite rudimentary.) 

 (Esophagus. — That part of the alimentary canal connecting the mouth with the 



stomach. 

 Organ. — Any part of the body concerned in some action or function. 

 Oviparous. — Producing eggs. 

 Oviposition. — The act of laying eggs. 

 Ovoviviparous. — Producing eggs which are hatched within the body of the 



parent or during the process of extrusion. 

 Parasitised. — Containing parasites. Affected or attacked by parasites. 

 Par astigmatic glands. — Small circular glands sometimes present round the 

 openings of the spiracles. (They secrete a waxy powder similar to that 

 produced by the ' circumgenital glands.') 

 Parthenogenesis. — Reproduction without the assistance of the male by a pro- 

 cess of internal budding, by which several or many successive generations 

 of fertile females may be produced. 

 Pellicles. — The ' exuviae ' or cast larval skins. More particularly applied to the 



hardened larval skins attached to the ' puparia ' of the Diaspince. 

 Plate.— P^ny broad flattened piece. Definite horny tracts of the tegument. 

 Processes. — Any prominent portions of the body not otherwise definable. 

 Prostertium. — The ventral parts of the ' prothorax.' 



