I

imbricated
Overlapping.
imago
An adult insect.
incrassate antenna
An antenna in which the antennomeres gradually increase in width towards the apex or increase and subsequently decease in width. When the increase is marked, the antenna looks club-like and is often called clavate.
inquiline
Animal that shares a home with a unrelated animal with no apparent adverse effect on the animal.
integument
Outer cuticle or epidermis of insect and helminthes.
instar
Stages of growth, each separated by a moult.
intercalary vein
Longitudinal vein arising from the wing margin inwards but not connecting with any main veins.
intercoxal process
(of abdomen). See Abdominal process
intercoxal process
(of prosternum). See Prosternal process
interfacetal setae
Setae arising between adjacent eye face
invagination
To fold in so that an outer becomes an inner surface.