Albert Lea Seed House Oat Production Guide - Page 38

Return to preceding couplet (12’). nubs no nubs Figure 13.1. Figure 13.2. 13 13’ Conspicuous tooth on front corners of pronotum. Antennae with distinct club. Combination often referred to as ‘nubs and clubs’. Foreign grain beetle – Ahasverus advena Return to preceding couplet (13’). No conspicuous tooth (or nub) on front corners of pronotum. Go to couplet 14 Figure 14.1. Figure 14.2. 14 14’ Red flour beetle Tribolium castaneum Gap between eye differences: Gap narrow or wide. View comparison here 38 Antennal club differences: Club distinctly or gradually enlarged. View comparison here Confused flour beetle Tribolium confusum Lateral eye width differences: Eye more than four or only two facets wide at narrowest point. View comparison here