A new species, Homidia tiantaiensis, is described from Zhejiang Province, China. It differs from the all known species of the genus in its color pattern. It is very similar to the Korean species, H. flavonigra Szeptycki, 1973 in many aspects; however, it is separable from the latter by the setae on labrum, labium and dental base and the chaetotaxy on Abd. III.
The natural distribution, diffusion, and geographical origin of the genus Homidia Brmer, 1906 （Collembola： Entomobryidae） are investigated based on the geographical distribution of the genus Homidia. Of the 57 species of the genus Homidia known worldwide, most are distributed in Asia （54 species） with China （32 species including 23 native species） having the most species in this genus. The only region outside Asia with a significant fauna is United States including Georgia, Illinois, Louisiana and Hawaii （6 species）. The authors propose a theory for the origin and diffusion of members of this genus.
