A Grammatical Dictionary of Botanical Latin

Ips, gen.sg. ipis (s.m.III), abl.sg. ipe {> Gk. ἴψ (íps) [iota psi], a wood- and horn-eating worm cf. iptomai, ipsomai, to press hard; to oppress];

Ips, gen.sg. ipis, abl.sg. ipe: an Engraver Beetle, an insect particularly destructive of European spruce trees (Picea spp.) (family Curculionidae; Scolytidae; Ipidae).

   singular   plural
Nom  ips      ipes
Gen. ipis     ipum 
Dat. ipi      ipibus
Acc. ipem     ipes
Abl. ipe      ipibus

NOTE: in classical Greek, gen.sg. ipos, nom. pl. ipes (that is, the ‘s’ of the nom.sg. disappears). Note also the family name is Ipidae (not Ipsidae).

NOTE: in Greek, nouns ending in the letter psi do not form i-stem nouns in Latin; see also knips, gen.sg. knipis (s.m.III); thrips, gen.sg. thripis (s.m.III).

Ips, a genus of beetles called Engrager Beetles: Ips typographus, European spruce bark beetle, the Engraver Beetle, in reference to the long, winding chambered galleries excavated in the inner layer of the bark of coniferous trees.

NOTE: the epithet is a noun in apposition.