EXPLANATION OF SOME TERMS. 177 



Mediodorsal : lying along the middle line of the back. 



Mesial (of the wing) : along the middle. 



Obsolete: very nearly or quite wanting. 



Ocellar tubercles (of the chrysalis) : the prominences aris- 

 ing from the region of the e3'es. 



Ocelli (of the caterpillar) : the simple eyes, each composed 

 of a single facet. 



Ocelli (of the wing) : eye-like spots. 



Onisciform : shaped like a wood-louse (Oniscus), or slug- 

 shaped, i.e., flattened beneath and more or less ovate in 

 outline. 



Outer angle (of the fore w'ing) : the angle at the lower 

 limit of the outer margin. 



Outer margin: see Figure, p. 60. 



Papillae : small, pimple-like elevations. 



Papillate : covered with papillae. 



Parenchyma : the softer cellular tissue of a leaf. 



Pilose: covered with a nap of short hairs. 



Polymorphic : appearing under many different forms. 



Polyphagous: feeding on many different plants, omnivo- 

 rous. 



Prebasal (of the wing) : next but not at the base. 



Precostal vein : see Figure, p. 60. 



Premarginal: just before the margin (especially outer 

 margin). 



Process : any projecting appendage or part. 



Produced: extended. 



Kectangulate : forming a right angle. 



Saddle (of the chrysalis) : the depressed part of the back 

 at the base of the abdomen. 



Shield: see Dorsal shield. 



Stigma: see Discal dash or stigma. 



Stigmata: spiracles or breathing-pores. 



Stigmatal : along the line of the spiracles. 



Sub- (as a prefix) signifies nearly, as subglobular = nearly 

 globular. 



