| plagiognathus tumidifrons | | Canada: Ontario, Pautois, on Hwy 17, 3 km E of Rt. 630 | | 306995269 |
| plagiognathus tumidifrons | | Canada: Ontario, Ottawa, C.E.F., N of Bldt 140 | | 306995273 |
| plagiognathus tumidifrons | | canada: ontario, cambridge, rare charitable research reserve, site 3 - south field, forest edge | | 1318749947 |
| plagiognathus tumidifrons | | canada: ontario, cambridge, rare charitable research reserve, site 4 - blair flats, unburned prairie | | 1321378685 |
| plagiognathus tumidifrons | | canada: ontario, guelph, arkell research station | | 1321375511 |
| plagiognathus tumidifrons | | Canada: Ontario, Wellington County, Guelph, Biodiversity Institute of Ontario | | 1052113998 |
| plagiognathus tumidifrons | | Canada: Ontario, Leeds and Grenville, Elizabethtown-Kitley, 4452 Rowsome Rd., Elizabethtown | | 835477069 |
| plagiognathus tumidifrons | | canada: ontario, peterborough | | 1318751111 |
| plagiognathus tumidifrons | | Canada: Ontario, Wellington County, Guelph, Biodiversity Institute of Ontario | | 1061418799 |