68 EXPLANATION OF TERMS 



Insectologist: a student of insects: :_ entomologist. 



Insectology: the science of insect study: entomology. 



Insertion: the point or place where a part is inserted: a part that is in- 

 serted: the act of inserting. 



Insertus: a part that has its base set into another. 



In situ: in its natural place or normal position. 



Instar: the period or stage between molts in the larva, numbered to desig- 

 nate the various periods; e. g., the first instar is the stage between the 

 egg and first molt, etc. : see stadium. 



Institia: striae or furrows of equal width throughout. 



Instrumenta cibaria: mouth parts of a mandibulate insect as a whole. 



Instrumenta suctoria: mouth parts of a haustellate insect as a whole. 



Integer: entire: applied to a margin without incisions. 



Integument: the outer covering to the insect body. 



Inter : between ; among. 



Inter-alar space: in Odonata; the terga of meso- and meta-thorax. 



Interantennal: between the basal segments of antennae. 



Inter-articular: the membranous tissue between joints or segments. 



Intercalary -ies: additional or inserted between others; as a vein: plural; 

 added or supplementary longitudinal wing veins : see under specific head- 

 ings ; i. e., anterior, etc. : in Ephemerida, certain longitudinal veins between 

 the 8th (anal) and 9th (1st axillary) and not branches of either: in 

 Diptcra, the anterior intercalary (Loew) the discoidal, and the posterior 

 intercalary = the cubitus 1 of Comstock : applied to an evanescent sclerite 

 in the embryo between antenna and mandible ; also termed premandibular. 



Intercostal: between veins or costse; usually in the narrow grooves between 

 veins in the costal region of a wing. 



Intercostula: those small, vein-like structures between the normal veins, 

 visible on a wing margin but lost toward the disc. 



Intercoxal process: in Colcoptera; a median protrusion of the basal segment 

 of abdomen between the hind coxae. 



Intermediate: lying between others in position; or possessing characters 

 between two other forms. 



Intermediate field: of tegmina is = discoidal field; q. v. 



Internal area: in Hymcnoptcra; the posterior of the three areas between 

 median and lateral longitudinal carina on the metanotum : =. third lateral 

 area. 



Internal cell: in Hymcnoptcra (Pack.); =2d anal (Comst.). 



Internal triangle: in Odonata: see triangle. 



Internal veins: in Lcpidofrtcra; from one to three in number, run free from 

 base to outer margin near hind angle; never branched; la to Ic in the 

 numerical series; =anal veins (Comst.). 

 Interneural: between the nerves (or veins) of wings. 

 Interno-mandibular: applied to one of the pairs of salivary glands in bees, 



situated at the inner side of base of mandible. 

 Internomedian: in Orthoptcra; cubitus (Comst.) ; q. v. 

 Interocular: between the eyes. 



