in the "bibliotheca" the descendants of inachus followed deucalion's, and the "catalogue" appears to have followed the same order, likely introducing the inachids via the ehoie of niobe, the river god's granddaughter. to zeus she bore argus, the eponym of argos, who in turn sired peiren, the father of io. zeus's affair with io had a place in the "catalogue", for ancient authors cite the poem's version of this myth when quoting an "aition" for the fact that "all's far in love ...", at least: