7 o 



EXPLANATION OF TERMS 



Involucrate: = involute. 



Involucrum alarum: in Dermaptera a flap of the metanotum. 



Involute: spirally rolled inwardly. 



Involuti: butterflies whose larvae live in a folded leaf; Hcsperidw. 



Iridescent: a surface which reflects the prismatic hues. 



Iridicolor: any color so broken up as to reflect the prismatic hues. 



Iris: the circle which, in an ocellate spot surrounds the pupil. 



Irised: with rainbow colors. 



Ins-pigment: = iris tapetum. 



Iris tapetum: the pigment layer of the compound eye just below the crys- 

 talline cone. 



Irregular: unequal, curved, bent or otherwise twisted or modified without 

 order or symmetry, e. g., certain antennae. 



Irrorate: marked with minute points; freckled. 



Isabelline -us: pale yellow with some red and brown [chrome lemon with a 

 little carmine and roman sepia]. 



Ischia: = pleura ; q. v. 



Iso-: equal. 



Isolate: to separate out from others; occurring alone. 



Isomera: that series of Coleoptera in which the tarsi have an equal number 

 of joints on all feet. 



Isomerous: with equal number of tarsal joints on all feet: = homceomerous. 



Isomorphous : having the same form, appearance or construction. 



Isopalpi: that series of Trichoptera in which the palpi of both sexes have the 

 same number of joints. 



Isoptera: equal winged: an ordinal term for insects with four, similar, net- 

 veined wings ; mouth mandibulate ; thoracic rings similar, loosely jointed ; 

 metamorphosis incomplete : the Termitidcu. 



Isotypical: a genus described from more than one species, all of which are 

 congeneric. 



-itus: = -atus ; q. v. 



-ius: suffix; having the power or ability to. 



J 



Jabot: the crop; q. v. 



Janthine: violet colored. 



Jaw-capsule: contains the mouth structures in those dipterous larvae in which 



the head is differentiated. 

 Johnston's organ: a complex nervous structure in the basal joint of dipterous 



antenna'. 

 Joint: a segment or part between two incisures: an articulation. 

 Jubate-us: fringed with long pendent hairs. 

 Juga: the lateral anterior lobes of the head of a Ileteropteron ; each side of 



the tylo. 

 Jugatae: that series of Lepidoptera in which there is a jugum instead of a 



frenulum to unite the wings in flight. 

 Jugular: of or pertaining to the throat. 



