Six found under the rim of a tub of dried mealworms in a hardware shop; four alive, two dead.
No interactions present.
To quote DGH Halstead (1963) "separation of the species [Sitophilus oryzae and S. zeamais] can be achieved with certainty only by examining the genitalia". Good illustrations of the bits of males and females in his paper in EmM 99: 72-74.
I've only found S. zeamais in the local pet shop but used to have S. oryzae in the kitchen of a previous residence.
I quite agree - I've kept the two specimens I brought home, so if/when I get round to the dissection, this may get changed or made more certain...
Just dissected the weevil; the dorsal side of the median lobe is smooth without longitudinal sulci - this makes it S. oryzae,
I browse history, more of us should do that.
My 2015 agreement is based on Dave' assertion and 15 informative minutes 'in' the WebThing.
"4 yellow marks on the elytra.." (Pic1)
Lat/Lng: 50.9, -1.4
OS grid ref: SU4519