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 inserted: 

 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. 



Instiumenta 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 headings ; 

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

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

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

 = the cubitus 1 of Comstock : applied to an evanescent sclerite in the em- 

 bryo between antenna and mandible ; also termed premandibular. 



Intercostal: between veins or costs.'; 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 Coleoptera; a median protrusion of the basal segment 

 of abdomen between the hind coxre. 



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 Hymenoptera ; the posterior of the three areas between 

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

 area. 



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



Internal triangle: in Odonata; see triangle. 



Internal veins: in Lepidoptera; 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 Orthoptera; cubitus (Comst.) ; q. v. 



Interocular: between the eyes. 



