Laura Uribe
Grupo Vasconcelos
Aculco de Espinoza, Estado de México.
first picture shows it just about to fly off!
Emerged from potted plants brought into the house during winter.
Dichelonyx albicollis (~12 mm); species ID tentative!
This seems to key (Harpootlian) to D. albicollis , based on longitudinal groove (sulcus) on the pronotum. This is faint, and that reference does say character is variable. Other features, such as the elytral costae seem to match albicollis.
I guess another possibility is Dichelonyx subvittata, which has a similar habitus, but it does not seem to have a trace of any sulcus on the pronotum.
Also posted at:
https://bugguide.net/node/view/2257895
References
Blue Lake, South Okanagan Grasslands Protected Area, Osoyoos, BC, Canada