A Grammatical Dictionary of Botanical Latin

-ips, gen.sg. –ipis, third declension Latin nouns ending in; nouns derived from Greek third declension nouns ending in psi in the nom.sg. These do not form i-stem nouns in Latin.

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

   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).

Knips, gen.sg. knipis, abl.sg. knipe, q.v.: = Gk. κνῑ́ψ (knī́ps) : an insect found in the bark of trees; a kind of insect that infests fig and oak trees and devours the gallfly (Liddell & Scott):

    singular    plural
Nom  knips      knipes
Gen. knipis     knipum 
Dat. knipi      knipibus
Acc. knipem     knipes
Abl. knipe      knipibus

= σκνίψ, small creatures which infest fig and oak trees and devour the fig-insect (ψήν) (Liddell & Scott).

NOTE: in classical Greek, gen.sg. knipos, nom. pl. knipes (that is, the ‘s’ of the nom.sg. disappears).

Thrips, gen.sg. thripis (s.m.III), q.v., abl.sg. thripe: Gk. θρίψ (thríps): woodworm; “a kind of insect that attacks wood” (Glare) [family Thripidae).

     singular    plural
Nom.  thrips    thripes
Gen.  thripis   thripum
Dat.  thripi    thripibus
Acc.  thripem   thripes
Abl.  thripe    thripibus

NOTE: in classical greek, gen.sg. thripos, nom. pl. thripes (that is, the ‘s’ of the nom.sg. disappears). Note also the family name is Thripidae (not Thripsidae).