Pupal cases of Nearctic robber flies (Diptera: Asilidae) Author Dennis, D. Steve Author Barnes, Jeffrey K. Author Knutson, Lloyd text Zootaxa 2008 2008-09-03 1868 1 1 98 https://biotaxa.org/Zootaxa/article/view/zootaxa.1868.1.1 journal article 10.11646/zootaxa.1868.1.1 1175­5334 5133591 Key to known pupal cases of Nearctic species of Ommatius 1 Outer or third posterior antennal process rounded and ridge­like; proboscial sheath smooth, except for slight rugoseness posteriorly; thoracic area above wing sheath with yellowish dorsomedian bristle­like spine behind posterior mesothoracic callosity; segment 1 without dorsolateral bristle­like spine on each side; venter of segment 8 with 15 bristle­like spines......................................... Ommatius gemma Brimley ­ Outer or third posterior antennal process apically acute; proboscial sheath smooth with rugose swellings on each side of midline posteriorly and median concave tubercle separated from swellings by narrow ridge of cuticle; thoracic area above wing sheath without dorsomedian bristle­like spine; segment 1 with 1 dorsolateral bristle­like spine on each side; venter of segment 8 with 4 bristle­like spines........................... ................................................................................................................................... Ommatius tibialis Say